Basic Function of Semiautomatic MIG Welding Machine

Basic Function of Semiautomatic MIG Welding Machine


Functioning a satisfactory MIG Welding process requires more than just semi operative skill. The setup, voltage, current, electrode extension, and welding angle, as well as other factors, can dramatically affect the weld produced. The very best welding conditions are those that will allow a welder to produce the largest quantity of successful welds in the shortest period of the time with the highest productivity. Because these are semiautomatic or automatic processes, increase productivity may require only that the welder increase the travel speed and current.


In complete MIG welding machine setup, we require GMAW or MIG power source, welding torch, wire feeder unit, shielding gas supply, gas regulator, flow meter & heater, shielding gas hoses and MIG wire.

If the shielding gas supply is a cylinder, it must be chained securely in place before the valve protection cap is removed. Standing to one side of the cylinder, quickly cracked the valve to blow out any dirt in the valve before the flowmeter regulator is attached.

Install the reel of electrode (welding wire) on the holder and secure it. B sure the power is off before attaching the welding cables. The electrode and work leads should be attached to the proper terminals. The electrode lead should be attached to electrode or positive (+). If necessary, it is also attached to the power cable part of the gun lead. The work lead should be attached to work negative (-).


Using the MIG Welding Machine that was properly assembled, we need to turn the machine on and thread the electrode wire through the system. Switch on the power and check the gun switch circuit by depressing the switch. The power source relay, feeder relays, gas solenoid and wire feeder motor should all active.

Cut the end of the electrode wire free. Hold it tightly so that it does not unwind. The wire has a natural curve that is known as its cast. The cast is measured by the diameter of the circle that the wire would make if it were loosely laid on a flat surface.

Note: With the wire feeder running, adjust the feed roller compression so that the wire reel can be stopped easily by a slightly pressure. Too light a roller pressure will cause the wire to feed electrically. Too high a pressure can turn a minor problem into a major disaster.


Density is the chief determinant of how effective a gas is for arc shielding. The lower the density of a gas the higher will be the flow rate required for equal arc protection. Flow rates, however, are not in proportion to the densities. Helium, with about one-tenth the density of argon, requires only twice the flow for equal protection.


The arc-voltage and amperage characteristics of MIG Welding are different form most other welding processes. The voltage is set on the welder, and the amperage is set by changing the wire feed speed. At any one voltage setting the amperage required to melt the wire must change as it is fed into the weld. It requires more amperage to melt the wire the faster it is fed, and less the slower it is fed.


Because of the constant-potential (CP) power supply, the welding current will change as the distance between the contact tube and the work changes. Although this change is slight, it is enough to affect the weld being produced. The longer the electrode extension the greater the resistance to the welding current flowing through the small welding wire.

With a standard MIG Welding CC power supply this would also reduce the arc voltage, but with a CP power supply the voltage remains constant and the amperage increases. If the electrode extension is shortened, the welding current decreases.


The term welding gun angle refers to the angle between the MIG Welding gun and the work as it relates to the direction of travel. Slight changes in the welding gun angle can be used to control the weld as the groove spacing changes. A narrow gap may require more penetration, but as the gap spacing increases a weld with less penetration may be required. Changing the electrode extension and welding gun angle at the same time can result in a quality weld being made less than ideal conditions.

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Welding Types and Welding Rods

Welding Types and Welding Rods

Welding is the process of heating two pieces of metal so that they join and form a firm joint. To do this, one needs a high degree of skill and technology. There are different ways of welding; some require machinery and advanced technology, including lasers, beams, etc. Welders work with metals, alloys and materials.

Oxy-Acetylene Welding is a welding process that requires the use of a special welding torch to mix oxygen and acetylene gases and produce a small flame of up to 6,300 degrees. This process is widely used to manufacture wrought iron gates and fences. This type of binding is normally used in industries that work with copper pipes, including brass wear plates and brass rods.

Gas Cutting Using Oxy-Acetylene

Most of the gas torches have a lever style valve that facilitates an extra burst of oxygen through the cutting torch to the work that has been heated to melting point. This shot of oxygen burns away the parent metal with high force and speed, thus producing a small narrow cut in the metal. This way, welders can cut easily, either manually or by machines. Manual gas cutting can cut metals of 1/16 of an inch and up to two inches, while profile cutting can cut steel up to a thickness of four inches.

TIG welding

Tungsen welding or TIG welding uses a non-consumable tungsten electrode to create the weld. The weld area is protected by an inert shielding gas and a filler metal is normally used. This type of welding is usually used to thin sections of stainless steel and metals like aluminum, copper and magnesium.

Plasma arc welding

In plasma arc welding, the electric arc is formed between an electrode and the work piece. The process is similar to TIG welding.

Laser Beam welding

Laser Beam welding is a meld technique where multiple pieces of metal are joined through the use of a laser. This type of welding is often used in high volume applications, such as in the automotive industry.

Welding rods

Welding rods of good quality should be bought, so that the welding result is better. Welding rods are used to place additional metal to the weld. Hence, it needs to suit the parental metal. Welding wire and oxy-acetylene rods are mostly made of Norway steel. Choosing the right welding rod is important as it helps to determine the success of a weld and the strength of a joint. If you choose the wrong rod, it can produce a meld that is either too hard or brittle.

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TIG Welding Revisited

TIG Welding Revisited

Welding, as is known by so many, is the process used for fusing metals. There are distinctive types of welding processes like arc welding, gas welding and resistance welding. TIG, or Tungsten Inert Gas may be described as a type of gas metal arc welding. Instead of flux coated electrodes a gas shield is used to purge oxygen from the weld path. Bare wire is fed into the gas shield area while the tungsten electrode burns the bare wire fusing the bare wire to the parent metal.

One of the major advantages to a TIG welder is higher amperage which allows for greater thickness of metal to be welded, amongst other advantages relating to the purity of the metal, cleaning etc. Welding with TIG demands the work pieces to be prepped an cleaned properly. Let’s look at the advantages of Using TIG:

1. TIG is qualified as being a better quality weld

2. The skill sets used to produce that type of weld are higher on the part of the welder

3. The process of TIG usually uses more than one process

4. The weld is usually cleaner allowing for higher quality of welding overall

5. TIG welding is a most respected art category

6. The variation of types of metal that can be fused are greater

7. Can lead to a stronger overall weld composite

These just mention a few. Learning to TIG weld can be challenging but it is a most beneficial way to go about the weld. TIG welding is considered as the most flexible type of welding as it can blend all conventional metals like Carbon and low alloy steels, stainless steel, nickel alloys, aluminum, magnesium, titanium, cobalt, and copper alloys. Once the commitment is made to use this great process there must be an insight into areas of concern that may lead to complications with this type of welding as well.

There should be constant voltage no matter whether AC or DC electric current is used. The three most common hassles encountered by the operator in TIG welding are erratic arc, high electrode consumption and porosity of the weld.

Lack of fusion, leaks from hoses transporting the shield gas (that draw air into the hose), weld puddle turbulence, contamination of metals form improper cleaning, and porosity (or gas pockets) are some areas the TIG welder should concern himself/herself with.|Improper fusion, faults in the connections and hoses, puddle turbulence, contaminants of metals to be welded, or porosity of the weld are places the TIG welder should concern himself with in this process.

There is a middle of the road area for gas flow to the TIG gun while the weld is in progress. Usually around ten to twenty five cubic feet per hour is normal. I have been in windy spots before and had to boost up the gas coverage on my rig to keep the shield from being blow away from external forces. When you suffer a loss of your gas shield you get weld breakdown. With that said I think the best gauge to purchase is the style of gas gauge that will let the TIG welder really dial up high settings if needed. Your average flow meter will not allow for maximum range at times. It’s best to purchase one designed like an oxygen regulator instead of the typical argon meter.

Be mindful of the types of gas lenses being used and what type of TIG gun you will use as well.

You know there is just a wealth of information to be considered in such a tremendous topic like welding of this nature. I would like to cover the actual weld actions too but time won’t afford me the space to do it here.

For more information concerning the actual welding process and the dos and don’t of TIG Welding please visit: [] and view the weld while in progress.

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Most Commonly Used Equipment in the Welding Industry

Most Commonly Used Equipment in the Welding Industry

Welding machines are useful for a number of joining processes. This includes arc welding, resistance brazing, laser soldering, electronic beam soldering, orbital fusing, and more. Each type of machine features different devices that include power sources, monitors, and controllers for brazing, soldering, and welding.

MIG Welding

One of the most versatile and common types of welding machines are metal inert gas or MIG welding machines. They are useful in home workshops and industries for welding different metals such as steel, stainless steel and aluminum. This is a process in which a continuous electrode and shielding gas is fed through a MIG torch or welding gun. Carbon dioxide gas is commonly used for general purpose welding since it’s cost-effective and creates good welds. The voltage, amperage and speed of electrodes and shielding gas through the welder could be adjusted. In addition, the flow of gas can also be controlled through a flow meter while the tension on the welding wire is variable as well.

TIG Welding

TIG or Tungsten inert gas welding machines are useful in welding thinner sections of stainless steel and non-ferrous metals such as copper alloys, magnesium, and aluminum. The process involves a tungsten electrode that delivers the current to the soldering arc, a shielding gas such as argon to protect the weld area from contamination, and a filler metal. TIG welding machines offer the operator greater control when compared with MIG welding. These machines are available with DC or direct current and AC/DC alternating current, direct current which is useful for fusing ferrous types of metals and both ferrous and non-ferrous types. TIG welds are clean without the buildup of sparks and fumes, which makes it ideal for welding metal artwork. It is also used to weld aluminum cycle and motorcycle frames and food processing equipment.

Arc Welding

Arc welding or stick welding machines use a power supply to form an electric arc between an electrode and base material that melts the metals at the fuse point. Either alternating or direct current could be used. The electrode is made from a material compatible with the base material that needs welding. It’s covered with flux to produce carbon dioxide gas to prevent oxidation and contamination. Arc welders are available in two types. Alternating current welders are air-cooled or oil cooled while direct current welders uses an air cooling system. Inverter welders are the most common type of DC arc welders. While arc welding is generally limited to ferrous metals, it is also possible to weld cast iron, copper, nickel, and other non-ferrous metals. Therefore, arc welders are useful for a number of applications in repair work and construction.

Welding equipment comes in a variety of shapes and sizes ranging from small welders for home use to industrial machines used in specialized industries such as automotive and construction. Mig, Tig, arc and spot welding machines are the common types used today.

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A Handful of Main Reasons Why Underwater Welding Is a Very Good Occupation

A Handful of Main Reasons Why Underwater Welding Is a Very Good Occupation

Under the sea welding, or hyperbaric welding, involves welding under the sea, generally underneath grand challenges and tough situations. Oceanic welding is often executed to mend boats, underwater pipelines, commercial fuel platforms, along with other vessels that could be completely, in addition to somewhat under the sea.

There are a couple of types of oceanic welding: Dry as well as moist. Dry sea welding is going to be performed inside of a chamber which is packed with a gasoline mix and after that sealed across the vessel, platform or else additional under the sea form which is in the process of being welded. Moist oceanic welding is done away from a chamber, inside the water.

Is marine welding an excellent professional job? Without a doubt it truly is! Listed below are the highest reasons underwater welding is a superb career, and can often be a an exceptional career switch for you.

Under the sea welding keeps you in fantastic shape. Granted, most likely not the very first thing many individuals remember when deciding upon a profession, but, seeing that marine welding usually takes optimum physical shape, a new career in under the sea welding is an excellent way for you to make sure your body is at its optimal condition.

Marine welding could possibly be tireless on the physical body, therefore it’s crucial for welders to preserve their bodies in top notch physical condition making sure that they can not only undertake the scuba aspect of a typical gig, but still have the ability to complete accurate welding guidelines also.

The income for the marine welder is in fact exceptional. Naturally, what a number of people do consider when choosing a career might be the wage. Marine welders could make efficient hard earned money. The very beginning salary for an excellent sea welder is generally just about one hundred thousand dollars a year, many welders yield $200,000 or even much more! Welders which are willing to move or who will complete urgent welding assignments have the ability to earn a superior income and land jobs that can compensate above the normal marine welding work.

Sea welders could accept expensive extras at work. Because of the negative aspects involved with some aspects associated with oceanic welding, for example welding within elevated depths, welders typically are given bonuses which actually rely on the volume of danger at a particular undertaking. A standard promotion for a lot of welders depends upon exactly how far they need to dive to perform their work. A welder who has to a dive, for example, 100 ft under the sea will frequently receive an incentive of between a hundred dollars to two hundred bucks each and every hour above their current conventional pay.

The career prospect concerning underwater welding is optimistic. The very industries which normally train more marine welders are simply improving in size and recognition through the years. For instance, ships, leisure and otherwise are more accepted now inside the coastline, which implies you will see greater of a desire for oceanic welders in the future. This is also true for anyone of the many companies who take on marine welders. Many roles do not possess this kind of great benefits! Underwater welding adds the two fantastic hobbies. Scuba diving is a well-liked action for many people. It could possibly be comforting, a lot of fun and fascinating being underwater for a specified length of time. And also welding is work which requires excellent skill in addition to soundness. Underwater welding includes the past time of scuba diving together with the tactic of welding to create an intriguing and fruitful profession.

To know more, visit our recommended website on Under Water Welding [] and also learn how to obtain Underwater Welding Certification

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The Need and Significance of Metal Fabrication Welding

The Need and Significance of Metal Fabrication Welding

The process of metal fabrication welding is as much an art as it is a science. This process entails joining two metal pieces into a single piece with the use of heat. In most cases, the two pieces of metal to be joined together are molten at the targeted joint and they are further bonded by using a filler material that securely holds these two materials together. While the use of heat (usually in the form of a flame) has been the conventional welding method, today you shall find lasers, electric arcs and even ultrasound to carry out this process.

This method is also used for prototype machining, in which an archetype of a machine is made and tested for feasibility before the final product can be made. Since both these techniques require a considerable amount of skill, one needs to partner with a reputable firm for such services.

A firm that boasts of metal fabrication welding as their core competency is more likely to offer you a better service. Since these services are used for the high end manufacturing of large and small industrial machinery or components, one cannot take a chance with quality. So whether you need a unique product or a batch of components, you can outsource these requirements to a machining firm. This process begins with a design-so a lot depends on the accuracy of the design that is being created for you.

These services are required by several industries including but not limited to aerospace, tooling and fixtures, assemblies, composites, energy sector, wind, hydro power, nuclear power, pipelines, marine industry, infrastructure construction and many others.

Now let’s discuss some of the salient features of Metal Fabrication Welding:

  • This technique of joining two metals endows the final part with strength and stability.
  • Parts or components such as valves can be made according to tight tolerances and in adherence to industry codes.
  • It is possible to create machines and components that can offer you different work patterns and outputs.
  • Welding can be performed on different shapes and sizes of welds. It can help join metal pieces at different angles.
  • Once the welding process is executed, its strength can be ascertained with the help of several tests. This helps to check defects such as cracks, incomplete fusion, distortion, undercutting etc at an early stage. The errors can then be rectified suitably. Testing errors is an important aspect of Prototype machining.

When the process of welding is carried out, the risk of distortion exists. Only an expert machinist can help control such risks. In addition, if you need to procure highly complex or intricate parts with difficult metals and geometrical shapes, it is advisable to enlist the services of a reputable metal fabrication welding firm.

I am a registered Professional Engineer & Certified Metal Fabrication Welding Inspector who has worked the last ten years. My interest is the training aspect on Prototype machining, metal fabrication welding processes, machine tools, conducts through seminars.

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Sheet Metal Fabricators – Hot Tips For Welding Flat Rolled Steel

Sheet Metal Fabricators – Hot Tips For Welding Flat Rolled Steel

As fabricators acquire experience welding SCS strip steel we discover great news with regards to better weld quality, cost savings on filler wire and, of course, decreases in toxic welding fumes as opposed to welding P&O steel. Still, we sometimes learn of a new user having problems with too much weld spatter while welding the SCS steel. Research show that modest alterations in shielding gas and filler wire feed eradicate excessive spatter and produce larger cost savings on consumables. This write-up offers the foundation of theSCS sheet steel strengths and describes welding practices that permit sheet metal fabricators to enjoy those rewards while steering clear of the excessive spatter.

Consistently Stronger Welds.
Six years ago comparable samples of welded SCS treated steel and Hot rolled pickled and oiled sheets were tested metals testing laboratory. It required an average 580 pounds greater shear load to induce failure in welded SCS treated steel samples than the P&O samples.

SCS treated steel benefit comes from greater weld integrity. A certain amount of weld arc’s energy would go to burning up the oil on Hot band oiled sheets. This brings out even even more contaminants to a Pickled and oiled surface that is already fairly dirty when compared to SCS sheet steel. The net outcome is to lower the integrity of HRPO welds compared to SCS treated steel welds.

That Issue of Excess Spatter.
Most sheet metal fabricators who switched to SCS treated steel reported cleaner, stronger welds with really no spatter. However, a handful noted unacceptable amounts of spatter.

To discover the underlying cause, The Material Works, Ltd. recruited the support of the Illinois Manufacturing Extension Center (IMEC) which provides technical services to companies. IMEC’s project manager partnered with Optimum Engineering Solutions, Inc. to perform controlled welding tests of SCS sheet steel. They duplicated the welding procedures of fabricators who reported excessive spatter and observed similarly undesirable results.

Then they, evaluated adjustments in shielding gas make up and filler wire feed rate. Changing from 90%Argon-10%CO2 to 95%Argon-5%Oxygen enhanced arc stability and greatly decreased spatter. Decreasing wire feed speed worked well with the new gas recipe. Using ER70S-6 filler wire at a slower feed rate with the Argon-Oxygen selection delivered notably better penetration and improved bead appearance when welding at the same speed.

The study discovered that the best parameters for welding SCS sheet steel (or Oiled strip steel for that matter) were different from what these fabricators had been using. A change to the optimized shielding gas and filler wire combination not simply assures exceptional SCS treated steel welding performance, it also provides savings on consumables!

The gas supplier for the analysis sells the Argon-Oxygen mix at five percent under the Argon-CO2 mix. But even bigger savings are realized on filler wire. The more even weld bead you receive with optimized SCS sheet steel parameters translates to less filler material for a given weld joint. Couple that with a lower wire feed rate for the identical welding rate, and the savings in welding wire can reach 30%.

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Different Types of Stainless Steel Has Different Welding Properties

Different Types of Stainless Steel Has Different Welding Properties

If you are thinking about the steel fabrications, it is wise to perhaps think about the welding requirements later. After all, the steel fabrications are done by using different types of steel alloys. Now, they have different properties, and features. Therefore, it is important that you choose the right alloy for the purpose. Remember, some of the alloys provide high corrosive resistance. But, they may not be high in terms of the machinability. So, it is really essential that you choose the right material that will complement the purpose and the environment of the fabrication. Another very important factor to consider is of course the welding properties. Actually, there are some steel alloys that can’t be used for welding.

A great exception to this is of course the austenitic stainless steel. This is the type is readily welded. The great thing with this type is that every type of electric welding methods can be utilized for this purpose. The standard equipments are useful for the welding process. However, you must note that these facilities are not applicable to the free machine grade versions of this type of stainless steel. If you are thinking about heavy sections that need welding, you should be going for the stabilized grades or grades that contain low carbon. However, you can also use the improved machinability grades for this purpose.

Another type of steel that you can use for welding is the duplex steel. Though they are not as good as the austenitic types, still you can use all the standard methods and consumables though the 2209 is the most used. However, the good thing with this type of steel is that it is less coefficient in thermal expansion than the austenitic steel and in fact, matches the carbon steels in this regard.

The next type is the martensitic stainless steel. This steel too, can be welded. However, one must take some precautions to make it effective. For, it generally produces extremely hard and brittle zone attached to the place of welding. So, one must take a lot of care in the pre heating to make sure that there is no crack occurring there. Sometimes, people weld this steel with the austenitic steel filler rods to improve the ductility of the deposits.

Finally, there is the Ferritic stainless steel which is the worst choice in case of welding. They have excessive grain growth, they lack ductility and they have sensitization – all three hampering the welding properties of the type.

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Welding Techniques for Fabrication

Welding Techniques for Fabrication

In industry most of the materials are fabricated into the desired shapes mainly by one of the four methods, casting, forming, machining and welding. The selection of a particular technique depends upon different factors which may include shape and the size of the component, precision required, cost, material and its availability. Sometimes it is possible to use only one specific process to achieve the desired object. However, more often it is possible to have a choice between the processes available for making the end product. In the latter case economy plays the decisive role in making the final choice.


Casting is perhaps the oldest known method of giving shapes to metals and alloys. When found suitable, it is the shortest route from the ore to the end product and usually the most economical. Through these days techniques have been developed to cast almost all metals and their alloys but still there are certain specific materials which have very superior casting properties, for example grey cast iron.


After casting followed the forming process in which the metals and their alloys are given desired shapes by the application of pressure, either by sudden impact as in the case of hammer blows or by slow kneading action as in hydraulic presses. Mechanical working of a metal below its recrystallisation temperature is called ‘Cold Working’ and that accomplished above this temperature is known as ‘Hot Working’. Both hot and cold working (and forming) is practised extensively in the industry.


It is the process of giving the desired shape to a given material by removing the extra or unwanted material by cutting in the form of chips. The cutting tool material is by necessity harder and stronger than the material to be cut. The machining processes commonly employed are turning, milling, drilling, shaping, planning, reaming, boring etc. Through lathes and milling machines were used in connection with watch making even in the fifteenth and sixteenth centuries but most of theses processes were introduced into the high volume industries in their present forms for making stream engine parts in the late nineteenth century but have come of age in the present century.


Welding as it is normally understood today is comparatively a new corner amongst the fabrication process through smith forging to join metal pieces was practised even before Christ. Through there are a number of well established welding process but arc welding with coated electrodes is still most popular welding process the world over.

These days different welding machine developed for different welding process like arc welding machine, MIG welding machine, TIG welding machine, welding rectifier, spot welding machine, plasma cutting machine and also portable welding machine like inverter welding machine (IGBT welding).

Arc welding in its present form appeared on industrial scene in 1880’s. Through there are conflicting claims about the inventor of this process but very often it is attributed to a Russian named Slavianoff who is claimed to have patented it in 1881. Arc welding machine, however, was not accepted for fabrication of critical components till about 1920 by which time coating for electrodes had been well developed. However, the demand for large scale production of heavy items like ships, pressure vessels, construction of bridges and the like provided the necessary impetus for welding to come of age and the Second World War firmly established it as the major fabrication process.

Welding which is a process of joining two or more parts of material (s) through provides a permanent join but does normally affect the metallurgy of the components. It is therefore usually accompanied by post weld heat treatment (PWHT) for most of the critical components.

Most materials can be welded by one process or the other. However, some are easier to weld than others. To compare this ease in Welding a term “Weldability” is often used. Weldability of a material depends upon various factors like the metallurgical changes that occur due to welding, changes in hardness in and around the weld, gas evolution and absorption, extent of oxidation, and the effect on cracking tendency of the joint. Depending upon these factors plain low carbon steels have the best weldability amongst metals. Quite often materials with high castability usually have low weldability.

Welding process widely used in the industry include oxy-acetylene, manual metal arc or shield metal arc (SMAW), submerged arc welding (SAW), metal inert gas (MIG), tungsten inert gas (TIG), thermit welding and cold pressure welding. Most of these processes have special fields of influence like resistance welding is popular with the automobile industry, thermit welding for joining rails in situ, MIG welding is particularly suited for welding of low carbon steel structures as also welding of stainless steels and aluminium, TIG welding is more popular with aeronautical and nuclear industries, SAW welding for ship building, cold pressure welding by food processing industry, and the like. However, SMAW or stick electrode welding and oxy-acetylene welding processes are the general purpose processes with a wide range of applications.

Some of the typical applications of welding include the fabrication of ships, pressure vessels, automobile bodies, off-shore platforms, bridges, welded pipes, sealing of nuclear fuel and explosives etc.

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Quality Standards For Industrial and Architectural Specialty Welding

Quality Standards For Industrial and Architectural Specialty Welding

High quality, specialty welding is essential for the building and maintenance of heating and cooling (HVAC) systems, as well as industrial and architectural structures. Educated, skilled welders are needed to complete projects so the appropriate quality standards are strictly enforced and maintained. Quality standards have been created locally and nationally to ensure quality welding, but nothing takes the place of hiring an experienced company with a respected reputation. Quality standards in the metal fabrication and specialty welding industry affect a wide array of business including restaurants, hotels, manufacturing plants, food plants, commercial offices and more.

Certified welding is an extremely specialized field. This interview with Brian Harkins, a Certified Welding Inspector (CWI) and 10-hour/30-hour OSHA trainer, helps explain the importance of quality welding standards. Mr. Harkins is Shop Superintendent at R.F. Knox Company, Inc. in Symrna, Georgia, and oversees all metal fabrication, welding certifications, welding procedures and the R.F. Knox Company welding program. Mr. Harkins also currently attends the National Labor College in Maryland and will graduate in 2009 with his B.A. in Labor Education.

Q. What are the quality standards of certified welding and how do you meet them?

A. The beauty and integrity in the welds of architectural fabrication are very important. Architectural projects often require that the weld be ground smooth and hidden. Industrial projects require good, penetrating welds that maintain their integrity over the long term. The heat of the weld is also an important consideration since heat can cause metal to distort and buckle.

Our expert metal fabricators and skilled welders have to know when, where and what type of weld to implement so distortion is minimal. Smooth, clean welds also minimize the risk of bacterial contamination for customers who work in the food or hospitality industries. Industrial welding requires durability and strength, as well as safety and cleanliness. At R.F. Knox Company, Inc. we employ educated, experienced skilled welders who utilize state of the art technology and can ensure every weld is finished with perfect precision.

Q. How are quality welding standards related to welding safety standards?

A. Quality welding standards run hand in hand with welding safety standards. For example, if we provide the customer with poor quality welds on an exhaust system this can potentially lead to exhaust system leaks, which can be very hazardous. We carefully test our welds on all pipes that carry hazardous material and condensation to ensure it meets both quality and safety standards. This eliminates the possibility of leaks that may jeopardize the safety of employees and public. I also visually inspect structural welds for any discontinuities that may create the risk of failure and to avoid any problems in the future.

Q. What kind of companies are most in need of high quality, sheet metal welding and architectural specialty welding?

A. Industrial food plants, restaurants, hotels and commercial offices are just a few of our clients. The hospitality, commercial real estate and manufacturing industries are in need of a variety of architectural and metal welding services. Commercial and food businesses also require exceptional quality welding in order to meet their own safety and quality standards.

We fabricate and install blowpipe systems, lab exhaust systems, wind tunnels and more based on the needs of the client. We provide many customized architectural and specialty services in order to provide our customers with architectural systems and features that will perform well and achieve their goals.

Q. When a company is in need of commercial, architectural or certified welding how can they identify skilled welders who are up to date an the latest quality standards? What are the most important things they should look for?

A. On request we certify welders for a specific job at R.F Knox Company, Inc. This way we ensure they are qualified for the job they are about to complete. We also have certified welders that maintain their certifications, so you can ask for their credentials, however you must remember that their particular certification may not apply to your application.

When it comes to welding there are certain details to watch out for to make sure a certified welder knows the business. If you see “shotty” welds, which are welds that don’t have a uniform appearance or are bulky and pitted, you may want to question the quality of the work. Welds should flow evenly over the metal and appear to not have any cracks or holes.

If possible, you should also take a look at the underside, opposite the side welded and see if any weld is coming through. If you can see the weld this means good, strong, penetrating welds have been completed. On architectural applications, where the weld has been ground smooth, watch out for gouges in the metal from grinding. Welds should be ground smooth and flush with the base metal. Only trained, skilled welders know the tricks for this type of specialty welding and grinding.

Sarah Benoit is a professional writer and specializes in technical, educational, health care, arts and music writing. To learn more about industrial and architectural welding, sheet metal fabrication or HVAC installation visit

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