Which method in resistance seam welding uses rollers with electrical pulses to create the weld?

The correct response is based on the unique characteristics of resistance seam welding, particularly how it employs the use of rollers. This method integrates rollers that apply pressure while simultaneously delivering electrical pulses to the workpieces. The electrical current passing through the metal creates localized heat through resistance, which is effective for forming a weld along the seam.

In the context of seam welding, the rollers play a critical role in ensuring that the weld is continuous and uniform along the length of the weld seam. This technique is especially beneficial for joining overlapping sheets of metal in a way that produces strong and durable welds with minimal distortion.

Other methods listed in the options have different applications and mechanisms. For instance, stitch welding typically involves a series of spot welds that are evenly spaced along the seam but does not involve rollers or electrical pulses in the same way. Electroslag welding is a completely different process typically used for thicker materials and involves a molten slag as a filler material rather than rollers or an electrical pulse method. Resistance spot welding focuses on creating welds at specific points rather than producing a continuous seam, thus differing fundamentally from the roller welding technique.

Ultimately, the use of rollers with electrical pulses is what clearly defines resistance seam welding, making it effectively suited for applications requiring strong