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Low carbon steel is one of the most readily spot welded materials, as well as being the most commonly used material for stampings and fabrications. It can be spot welded to many ferrous and non-ferrous alloys with varying success, depending on the combination of metals joined. Higher carbon and low-alloy steels can also be spot welded, although with reservations, because of a tendency to form harder welds, which may degrade weld performance. As carbon content increases, so does brittleness, with an associated propensity for cracking and weld separation.

Position the welding torch with the wire in the center of the hole contacting the back sheet of metal. It is important to arc against this back sheet rather than on the edge of the hole, otherwise the weld might not penetrate into the back sheet. The torch should ideally be pointing directly into the hole rather than at the angle in the photograph. Start welding in this position and don’t move the welder until the hole is almost full of weld. Then move the welder outwards in ever increasing circles until the weld is completed.

Spot welding is a resistance welding process that is used primarily for welding two or more metal sheets together by applying pressure and heat to the weld area. It works by contacting copper alloy electrodes to the sheet surfaces, whereby pressure and electric current are applied and heat is generated by the passage of current through resistive materials such as low carbon steels. Read extra details on Tecna Spot Welder.

Portable spot welders are compact, lightweight and handy for difficult-to-access joints. As such, they are most commonly used in coachbuilding. They have an average welding capacity of 2 + 2mm and are relatively inefficient due to the fact that the electrodes aren’t cooled between cycles. Automatic adjustment makes it easier to adjust the spot parameters according to the thickness of sheet and welding head used.