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WRC 014

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WRC 014 Welding Processes and Procedures Employed in Joining Stainless Steels

Bulletin / Circular by Welding Research Council, 1952

H. Thielsch

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A review of published and unpublished information on metal-arc welding, carbon-arc welding, gas welding, resistance welding and oxygen cutting. Discussion of welding characteristics and procedures, preparation of base steel, jigs and fixtures, welding technique, defects in welded joints, cleaning of welded joints, mechanical properties and applications.

Almost all commercial stainless-steel grades can be readily welded by any one of the common welding processes such as shielded-metal-arc, submerged-arc, oxy-acetylene, resistance, atomic-hydrogen and inert-gas welding. However, metallurgical, practical and economic considerations generally will give preference to one or several processes which produce the most satisfactory weldment. For example, stainless steel sheets up to thickness of about 1/16 to 1/8 inch are generally welded by the inert-gas tungsten-arc process. Spot and seam welding procedures are also widely used, particularly when joining thin sections where a high production rate is involved. One of the advantages of the inert-gas and spot- and seam-welding processes is that, by proper welding technique, a finished surface is obtained which rarely requires grinding. Nevertheless, the weld discoloration which appears on any fusion weld must be removed by sanding, sandblasting, electro polishing, pickling or still other cleaning and polishing methods. This final cleaning is particularly essential when good corrosion resistance is desired.

Stainless steel plates or more than 1/8 inch in thickness usually are welded by means of the shielded-metal-arc welding process. When production setups are available the medium and heavy gages are often most economically welded by means of the submerged-arc-process. In fact, even thin gages can be welded economically by submerged arc welding.