Spot welding can be divided into hard specification and soft specification according to welding current and power on time. The specification with large current in a short time is called hard specification. It has the advantages of high productivity, long electrode life and small weldment deformation. It is suitable for welding metals with good thermal conductivity. The specification with small current for a long time is called soft specification, which has low productivity and is suitable for welding metals with hardening tendency.

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