State four advantages of seam welding over spot welding.
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Advantages of seam welding over spot welding:- 1. Due to seam welding we get continuous weld which is air-tight 2. Gas tight as well as liquid tight joints can be made. 3. The Overlap is less than spot or projection welding. 4. The production of single seam weld and parallel seams can be got simultaneously. 5. Efficient energy use.

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