Welding For Steel. As for shielding gas a higher argon-based gas is recommended. Welded steel pipe refers to a steel pipe with a seam on the surface which is formed by bending and deforming a steel belt or a steel plate into a circular or square shape.
The best one to use is a mixture of 75 argon25 carbon dioxide. Up to ½ 50-100F. The filler metal to be used depends on the following.
Use an AWS classification ER70S-3 for all-purpose welding.
Ad High Performance Wide Range Structural Adhesives Bonding Plastic and Metal. Welding-steel is not applicable for free machining steels by any process including friction welding except when mechanical properties and especially fatigue strength are not important at all. Electrostatic Precipitators Disposable Media and Reverse Jet Cartridge Dust Collectors. The reason is that free machining steels contain in their composition sulfur lead or selenium for breaking the machining chips.