A Method for Controlling Residual Stress and Deformation of Welded Joint Filled on One Side of Thick Plate

Abstract

The invention discloses a method for controlling residual stress deformation of a thick plate single-face filling welding joint. The method for controlling residual stress deformation of the thick plate single-face filling welding joint comprises the following steps that 1) a groove is machined in two to-be-welded plates, the bottom of the groove is a bottoming welding bead, the thickness of the bottoming welding bead is t2, and the thickness of the two to-be-welded plates is t1; 2) the surfaces of the to-be-welded areas of the two to-be-welded plates are ground, the surfaces of the to-be-welded areas of the two to-be-welded plates are soaked into acetone for carrying out ultrasonic cleaning, and then blow-drying is carried out for later use; 3) the two plates to be welded are clamped through a clamp; and 4) stacking welding is carried out from bottom to top in the thickness direction of the two plates to be welded through a wire feeder and a welding device, vertical growth of a welding joint in the thickness direction is achieved, the residual stress deformation control of the thick plate single-side filling welding joint is finished, according to the method for controlling residual stress deformation of the thick plate single-face filling welding joint, the deformation after welding can be greatly reduced, and the residual stress of the component can be reduced.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a method for controlling residual stress deformation of welded joints filled on one side of a thick plate. Background technique [0002] The welding of thick plates is an essential key process in the construction of large-scale equipment in the fields of petrochemical, aerospace and military industries. The thickness of these facility components is generally more than 20mm, and the structural size is large, so they can only be connected and formed after segmental processing. In recent years, the application of multi-pass fusion filler wire welding in thick plate welding has received extensive attention. Thick plate multi-pass fusion filler wire welding has the advantages of high quality, high efficiency and high precision. At present, most of the research on multi-pass fusion welding of thick plates focuses on the optimization of welding parameters to reduce welding defects such...

AI Technical Summary

Problems solved by technology

However, the large deformation after welding and the high residual stress of the joint are the main problems of multi-pass fusion welding of thick plates

The residual stress in the welded joint is detrimental to the integrity of the workpiece, increases the brittle failure tendency of the workpiece, reduces the strength and fatigue life of the workpiece, and greatly reduces the service performance of the workpiece

For example, a certain type of engine uses D406A ultra-high-strength steel as its shell material. At present, the TIG welding process is mainly used. During the welding process, the residual deformation tendency of the ultra-high-strength steel solid engine shell with large-scale saddle-shaped welds is relatively large. Moreover, the deformation law is complicated, and it is difficult to correct the shape after welding, which may easily lead to out-of-tolerance dimensions or even product scrapping

Accurate prediction and reduction of welding residual stress and deformation are very important for obtaining high-quality components. In some studies, finite element calculation methods have been used to obtain numerical models for predicting joint corner deformation, but no method for controlling post-weld deformation and residual stress has been proposed so far. method

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