A post-weld heat treatment process

Abstract

The invention belongs to the field of welding technology, specifically a post-weld heat treatment process; the heat preservation equipment used in this process includes two arc-shaped clamps, which are arranged symmetrically up and down, and the contact part is a horizontal section , the horizontal sections of the two arc-shaped clamps are fixed by bolts; in the present invention, pressure discs of the same size as the workpiece are arranged on both sides of the ceramic fiber blanket, and after the two arc-shaped clamps are covered on the welding seam of the workpiece, Then fix the arc-shaped clamping plate tightly by bolts, so that the ceramic fiber blanket covers the surface of the workpiece, and then insert two compression discs on the workpiece on both sides of the arc-shaped clamping plate, and then make the two compression discs close to each other, and then The two pressing discs push the ceramic fiber blanket on the outside of the arc-shaped clamping plate into the gap between the arc-shaped clamping plate and the workpiece, so that the ceramic fiber blanket close to the workpiece is more compact, and the contact with the smaller workpiece The combination effect is better, thereby improving the heat preservation effect on the workpiece.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a post-weld heat treatment process. Background technique [0002] The welding residual stress is caused by the uneven temperature distribution of the weldment caused by welding, the thermal expansion and contraction of the weld metal, etc. All welding construction will inevitably produce residual stress. Post-weld heat treatment is a kind of heat treatment to eliminate the residual stress of welded joints and improve the structure and performance of welded joints. The most common way to eliminate residual stress is high-temperature tempering, that is, heating the weldment to a certain temperature and holding it for a certain period of time, using the reduction of the yield limit of the material at high temperature, so that the place with high internal stress produces plastic flow, the elastic deformation gradually decreases, and the plasticity The deformation gradually increase...

AI Technical Summary

Problems solved by technology

[0003] Due to the different diameters of the existing workpieces, in order to adapt the heat preservation equipment to different workpieces, the inner diameter of the heat preservation equipment needs to be larger than the workpiece, and then when the ceramic fiber blanket contacts the workpiece and heats the workpiece, the ceramic fiber blanket and the smaller diameter The contact tightness of the workpiece is poor, and it cannot be closely attached to the workpiece, which affects the heat preservation effect of the workpiece. In view of this, the present invention provides a post-weld heat treatment process, which can make the ceramic fiber blanket In close contact with smaller workpieces to ensure the heat preservation effect on the workpiece

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