Method for relieving residual stresses by controlling weld heat

Details Method for relieving residual stresses by controlling weld heat Method for relieving residual stresses by controlling weld heat

1984-02-24

1986-05-13

Albritton, C. L.

Electric heating

Metal heating

For deposition welding

219 761, B23K 904

Patent

active

045888698

ABSTRACT:
A welding machine is used to heat the outer surface of a butt welded joint of pipe sections such that the weld heat input condition q/t.sup.2 (where q: heat input and t: the thickness of the wall of a pipe) is higher than approximately 0.01 and the relative heat transfer coefficient ht/.lambda. (where h: the heat transfer coefficient between a coolant and the inner surface of a pipe and .lambda.: the thermal conductivity of a pipe) is higher than approximately 2, whereby the residual stresses at the inner surface of the weld can be relieved by utilizing the temperature difference between the outer and inner surfaces of the pipe.

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