Method and apparatus for joining metal components with mitigatio

Details Method and apparatus for joining metal components with mitigatio Method and apparatus for joining metal components with mitigatio

1994-04-22

1997-09-23

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219 75, 219136, 21914521, B23K 9167

Patent

active

056700725

ABSTRACT:
A welding process and an apparatus used therein 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 combines an extremely thin weld joint design with a non-circular cylindrical, thin welding electrode having an elongated cross-sectional shape. During welding, the elongated dimension is aligned parallel with the length of the weld joint. This combination enables joining of piping and other residual stress-sensitive components with both the initial weld joint preparation and the completed weld having a uniquely thin width and with a high aspect ratio of depth to width. Use of this high-aspect-ratio weld joint process substantially mitigates welding-induced residual stresses, without the normally required internal water cooling. The process is considered to be effective in mitigating residual stresses and the associated welding strains (distortion) in joints having any path shape, whether welded from one or more sides of the material.

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