Process for reducing residual stress of butt-welding seam of dissimilar metal thick-wall barrel body

Abstract

The invention discloses a process for reducing the residual stress of a butt-welding seam of a dissimilar metal thick-wall barrel body, and belongs to the technical field of control over welding residual stress. The process for reducing the residual stress of the butt-welding seam of the dissimilar metal thick-wall barrel body comprises the following step: a pressing step of applying an axial pressure on the butt-welding seam between dissimilar metal workpieces, and enabling metal in a welding seam area to generate the plastic strain of transversal compression and radial extension, so that thewelding residual tensile stress of the welding seam and areas at the two sides of the welding seam is released. According to the process for reducing the residual stress of the butt-welding seam of the dissimilar metal thick-wall barrel body, by applying the axial pressure on the butt-welding seam of the dissimilar metal thick-wall barrel body, the residual tensile stress at the butt-welding seamof the dissimilar metal thick-wall barrel body can be effectively reduced.

Description

Technical field [0001] The invention relates to the technical field of welding residual stress control, in particular to a process for reducing the residual stress of the butt welding seam of a thick-walled cylinder of dissimilar metals. Background technique [0002] At present, with the continuous progress of material science and material processing technology, dissimilar metal welding accounts for an increasing proportion of modern industrial production, and it has been widely used in nuclear power, rail transportation, aerospace and other fields. The welding structure made of dissimilar metals can not only meet the different requirements of different working environments on the material performance, but also reduce the manufacturing cost and give play to the performance advantages of different metal materials. [0003] The special working environment usually has requirements for the size and distribution of the residual stress in the welded joints of dissimilar metals, especiall...

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Problems solved by technology

[0004] However, due to the differences in the physical and mechanical properties of different metal materials, the design of the welding groove and the specific welding process, the distribution of residual stress in dissimilar metal welded joints is more complicated, and the level of residual tensile stress is also higher.

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