What is the welding Process?
Welding is the technique used in joining metallic parts usually through the use of heat. Resistance welding was invented in 1877 by Elihu Thomson, an electrical engineer and inventor whose discoveries in the field of alternating-current led to the development of successful alternating -current motors. The earlier type of resistance welding was accepted long before arc welding for the spot and seam joining of sheets. Spot, seam, and projection welding are resistance welding processes where the required heat for joining of metals is created at the interface by the electrical resistance of the joint. Welds are typically made in a short time of approximately 0.2 seconds using a low-voltage, high current power source with force applied to the joint through two electrodes, one on each side. Spot welds are made at systematic intervals on sheet metal that has an overlap. The strength of the joint depends on the number and size of the welds. Seam welding is a continuous process where the electr
