WELDING, CUTTING, AND BRAZING

Resistance Welding

The third welding process covered in this module is resistance welding. Resistance welding utilizes pressure and heat that is generated in the pieces to be welded by resistance to an electric current.

When conducting resistance welding, all equipment shall be installed by a qualified electrician in conformance with Subpart S, Electrical. If spot and seam welding machines are used, the following precautions must be taken:

All doors and access panels of all resistance welding machines and control panels shall be kept locked and interlocked to prevent access to live portions of the equipment by unauthorized persons.
In all press welding operations, if there is a possibility of the operator's fingers being under the point of operation, effective guards must be used. Examples of effective guards include an electronic eye safety circuit, two hand controls, or protection similar to that prescribed for punch press operations.

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