Which ONE or MORE of the following welds can be performed through resistance welding method?
Show Hint
- Seam
- Spot
- Fillet
- Groove
The Correct Option is A, B
Solution and Explanation
Resistance welding joins metal by passing a heavy current through the parts held under pressure, using their own electrical resistance to melt a small spot or line of metal. It only makes sense for specific weld types that match how the electrodes contact the plates, not for every joint geometry.
- Seam: correct. Resistance seam welding uses rotating wheel electrodes that roll along overlapping sheets, making a continuous line of overlapping resistance spot welds, which is exactly a resistance welding process.
- Spot: correct. Resistance spot welding is the most common resistance process, two pointed electrodes squeeze overlapping sheets at a single point and pass current through to fuse a nugget there.
- Fillet: wrong. A fillet weld is a triangular weld along the corner where two plates meet at an angle (like a T or lap joint edge); it needs an arc or gas flame to deposit filler along that joint, which resistance electrodes cannot reach or shape.
- Groove: wrong. A groove weld fills a machined groove between two plate edges placed end to end, which needs deep penetration filler metal from an arc process, not a resistance current path.
Seam and spot are the two weld types that describe how resistance electrodes actually contact and fuse the plates, so A and B are correct.
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