Workshop Technology
The current in electric resistance welding can be regulated by

Varying the input supply
Any one of the listed here
Changing the secondary turns of the transformer
Changing the primary turns of the transformer

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having thickness above 3 mm
Butt joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having 0.025 mm to 1.25 mm thickness

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