Which welding process uses electrical pulses through rollers for seam creation?

Resistance seam welding is a process that employs electrical resistance to generate heat, which is used to create seams by fusing the edges of two sheets of metal together. This method utilizes a series of rollers to maintain continuous contact and apply pressure to the workpieces while passing electrical current through them. The key feature of this technique is the application of pulsed electrical currents, which create localized heating at the interface of the metal pieces being joined.

This process is particularly effective for joining thin metal sheets, as it helps to minimize distortion and allows for a strong weld that can be applied to continuous seams, such as those seen in automotive or other large manufacturing applications. The use of rollers ensures consistent pressure and alignment throughout the welding process, contributing to the strength and quality of the weld seam.

In contrast, the other welding processes mentioned do not specifically employ the same method of electrical pulses through rollers. Electroslag welding typically involves a molten slag to conduct the current, while arc welding uses an electric arc for heating. Spot welding, on the other hand, involves placing two metal surfaces together and applying current to create localized spots of weld, without the continuous seam feature that resistance seam welding offers.