Method for mitigating residual stresses in welded metal componen

Details Method for mitigating residual stresses in welded metal componen Method for mitigating residual stresses in welded metal componen

1994-06-15

1997-11-18

Shaw, Clifford C.

Electric heating

Metal heating

By arc

228231, B23K 900

Patent

active

056884192

ABSTRACT:
A process for providing a significant improvement in the detrimental tensile residual stress condition on the root side of welds, especially on the inside wall of piping welds. The method uses a high welding torch travel speed (>10 inches/min), especially on the last one or two cap passes. The process relies on the limited thermal heat sink capability of the pipe wall and nearly completed weld joint itself to generate a significant through-wall temperature gradient, and therefore a sufficient through-wall stress gradient during the welding. This stress gradient results in metal plasticity and permanent strains, and therefore a reduction in the magnitude of the final residual stress or, preferably as conditions allow, a reversal in the direction of the stresses from tensile to compressive. The method can be used as a welding process or as a heat treatment. In the case of heat treatment, the far surface of the weld joint is heated without fusion of the material making up the far surface.

REFERENCES:
patent: 4095085 (1978-06-01), Tomita et al.
patent: 4302658 (1981-11-01), Beigay
patent: 4588869 (1986-05-01), Yoshida et al.
patent: 5022936 (1991-06-01), Tsujimura et al.
Krause, "Stress Improvement of GTAW-P-ME Welds in Austenitic Stainless Steel Pipe", Welding Journal, vol. 65, No. 5, May 1986, pp. 21-29.

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