Annealing of small parts can be accomplished by placing them between the terminals of an electric resistance welding machine, and turning on the current in the usual manner. Sufficient heat will quickly be generated to soften the metal.

Annealing with electric heating apparatus, correctly termed stress relieving, has been applied very successfully to welded carbon-molybdenum steel piping systems. These steels harden during the welding process and residual stresses are likely to be set up in the joint.

Stress relieving after welding will adjust these stresses. See ANNEALING, FURNACES, HEAT TREATMENT, METALLURGY, and INDUCTION HEATING.

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