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The goal of controlling welding stress is to reduce its peak value and make it evenly distributed. The main measures for professional welding processing to control welding stress are as follows:
1. Reduce the welding restraint: Try to weld the welds under a relatively small restraint. Avoid using the method of rigid fixation to control deformation as much as possible to prevent increasing the welding restraint.
2. Adopt a reasonable welding sequence: In the assembly condition with many welds, the welds with larger shrinkage should be welded first, and then the welds with smaller shrinkage. Weld the welds with larger restraint that cannot shrink freely first, and then weld the welds with smaller restraint that can shrink freely.
3. Reduce the weld size: Under the condition of meeting the design requirements, the weld size and layer height should not be increased. The concept that the larger the weld, the safer should be changed.
4. Use the hammering method to reduce the welding residual stress: Immediately after each welding pass is completed, use a round - headed slag - knocking hammer or an electric hammering tool to evenly tap the weld metal to make it produce plastic extension deformation and offset the local tensile stress borne after the weld cools.
5. Use a shot blasting machine for rust removal: Offset the welding stress of the component through the uniform knocking of steel shots.
6. Reduce the stiffness of the welded part and create conditions for free shrinkage.
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