Uses of spot welder

Most of the manufacturers consider spot welding as the most economical way to join two pieces of sheet metal. Even though welding sheet metal is the most common use of spot welding, the welder can be used for a large variety of joining and heat treating projects of which some are not so famous.

Usually annealing of production components is required during industrial process. It is generally done by sending the parts through an annealing oven which is economical. However, heating entire components often leads to undesirable distortion. Also oven annealing is not always a practical solution if production volumes are limited. The best practical solution is to pass a current through the joint. The resistance welding control uses and integrated infrared temperature as feedback device. During the process a fully controlled temperature rise and hold curve was achieved to anneal the entire joint without altering the metallurgy of the remaining part.

Resistance welding process is commonly regarded as a way to join round wire to make store displays or dishwasher racks. But this is not the only use of spot welders. These cross wire welding can be used to join other components from light bulb filament to automotive seating. There is yet another common example which is the bread toaster. One look inside the toaster would surprise you with the large number of cross wire joints used to form the bread guides and also to connect the heating grids to electrical power.

To securely fuse the cut ends of round or flat wire cable, the RW process is successfully used. This would reduce production cost and increase reliability as the fusing of stranded wire ends replace crimp connectors. The strand wire feeds continuously from a reel and is cut on the fly in normal production situations. This process is also used to produce wire pigtails and also carbon brushes for brush motors.

There is yet another usage of resistance welding which is little known. The welder is used to join greatly dissimilar metals like components used in a switch gear device that consists of two silver contacts joined to a solid copper bar. A specialized RW machine that creates a high temperature arc between the parts is used for the percussion welding process. The heat caused by high temperature rapidly merges the parts together. The actual heating and forging time is relatively very less. RW process is also used to join rolls of nails in pneumatic nail gun magazines.