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Unraveling the Mystery of Heat Treatment

05 October, 20 11:19 am · Leave a comment · reddarc
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This article originally appeared in Connector Magazine, Fall 2020 Edition

Erectors can save cost and time by taking this welding technique in-house

welding technique

Large steel erection projects commonly require heat treatment for welding because of the thick materials used in structural steel construction. Proper implementation is critical; so often this work is outsourced. The perceived level of expertise to perform this work can make the prospect of using in-house personnel daunting. However, most welding contractors are actually fully capable of performing on-site heat treatment operations.

The two primary methods for heat treating metal are preheating and post-weld heat treatment (PWHT). Preheating is the process of heating the base metal to a specific temperature prior to welding to minimize the temperature difference between the welding arc and the base metal. This process helps to reduce internal stresses that occur as substantial temperature differences between the weld and the base metal normalize, which can cause cracking and distortion. Slowing the cooling rate also allows hydrogen to escape from the weld, which minimizes the potential for cracking.

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Stud Welders

27 February, 19 4:43 am · Leave a comment · reddarc
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Some of the most difficult welds to make are those that require the welding of a small diameter to a plate. Gas tungsten arc welding or gas metal arc welding joints such as these require a high degree of operator skill, take a great deal of time, and can be a quality nightmare.  These factors become even more troublesome when the material with the small radius being welded is in the vertical or overhead position. Fortunately, Red-D-Arc provides stud welding equipment that increases productivity, decreases the required operator skill immensely relative to other welding processes, and allows for consistent, repeatable weld quality on materials with small radii.

What is Stud Welding?

Stud welding is a fusion welding process that is commonly used for the joining of small round stock to plate.  The process requires a power source, a stud welding gun, a ground clamp, and the materials that are to be welded.  To carry out the stud welding process, a solid, round piece of metal, also known as a stud, is placed into the stud welding gun.
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Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.