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How is welding residual stress generated? how to control,q345b steel pipe,erw steel pipe factory,seamless pipe china
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How is welding residual stress generated? how to control

Date:2023-05-10View:246Tags:a335 p91 pipe,pipe fittings factory,drill collar suppliers

Welding residual stress is an important problem in the field of welding engineering research. In the engineering application involving welding, we should pay attention to the influence of residual stress. For example, in the field of civil engineering, for the welding connection of steel structure, the residual stress has an impact on the fatigue performance and stable bearing capacity of the structure. Today, we will systematically understand the relevant knowledge of residual stress.


Residual stress refers to the macro stress that exists in the component or material and keeps itself balanced without external force or torque.

According to the scope of action can be divided into internal stress, also known as macro stress, throughout the whole body, internal stress exists in a single grain, when this balance is broken, the grain size will change, internal stress refers to the interaction between atoms.

On the micro level, different atoms or different arrangements of the same kind of atoms cause the uneven composition or structure of the material, which leads to the macro performance of the changes in the interaction force between atoms. Casting, forging, welding, spraying and machining process will lead to residual stress in the material.

Welding residual stress is the main cause of welding defects, such as deformation and cracking. Welding deformation endangers the shape and dimensional tolerance, joint installation deviation, increases the groove gap in the manufacturing process, and makes the manufacturing process more difficult. Welding residual stress can make the weld, especially the positioning weld, partially or completely broken, and the residual stress released in the processing process can also lead to the workpiece not to be welded At the same time, welding residual stress may lead to brittle fracture, tensile residual stress will reduce the fatigue strength and corrosion resistance, compressive residual stress will reduce the stability limit. Therefore, welding residual stress has always been one of the key problems in the field of welding.

Control method of welding residual stress

The process parameters with small linear energy, welding method and forced cooling measures are adopted. The reasonable welding sequence and direction are adopted to adjust the distribution of residual stress. The weld with large shrinkage and the weld with large stress are welded first. When the weld is crossed, the short weld is welded first, and then the straight long weld is welded. The process measures of reducing the weld restraint are adopted to compensate the weld shrinkage and hammer the middle layer of multi-layer weld It can be extended to reduce stress and restraint, pre stretch to compensate weld shrinkage, and local heating to form deformation in the corresponding part of the component that can compensate weld shrinkage.

Removal method of welding residual stress

According to the mechanical force or impact energy, it can be divided into weld rolling method, mechanical stretching method, hammering method, vibration method, explosion method, heat treatment whole high temperature annealing method, local high temperature annealing method, temperature difference stretching method (low temperature stress removal method) and quasi welding heating method.