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A method for controlling reheat cracks in welding heat-affected zone of structural components with large restraint degree

A technology for welding heat-affected zones and structural components, which is applied to welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of aggravating the tendency of reheat cracks in welded joints, so as to eliminate reheat cracks, reduce the tendency of reheat cracks, The effect of improving quality

Active Publication Date: 2021-07-09
DONGFANG TURBINE CO LTD
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Problems solved by technology

[0006] Finally, the structural weld with large wall thickness has extremely strong shrinkage and tensile stress on the two sides of the body. After welding, the body has a certain degree of anti-gravity deformation. state, gravity will be superimposed on the upper part of the near-surface welded joint, further aggravating the reheat crack tendency of the upper near-surface coarse-grained heat-affected zone of the welded joint

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  • A method for controlling reheat cracks in welding heat-affected zone of structural components with large restraint degree
  • A method for controlling reheat cracks in welding heat-affected zone of structural components with large restraint degree
  • A method for controlling reheat cracks in welding heat-affected zone of structural components with large restraint degree

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Embodiment Construction

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0023] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0024] Such as Figure 2 to Figure 5 As shown, a method for controlling reheat cracks in the welding heat-affected zone of a structural component with a large degree of restraint in this embodiment includes the following steps:

[0025] Step 1. Welding the first structural part 1 and the second structural part 2, so that they are connected through the welding joint 3 to form a structural assembly with a large degree of restraint;

[0026] Step 2, welding and remelting the weld bead 4 on the surface ...

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Abstract

The invention discloses a method for controlling reheating cracks in a welding heat-affected zone of structural components with a large degree of restraint, and belongs to the technical field of welding of structural components with a major degree of restraint. A method for controlling reheat cracks in the welding heat-affected zone of structural components with a large degree of restraint according to the present invention includes the following steps: Step 1. Welding the first structural part and the second structural part to connect them through welded joints to form a large restraint degree structure Components; step 2, welding and remelting the weld bead on the surface of the welding heat-affected zone of the welding joint in step 1. The invention can reduce the tendency of reheating cracks in the welding heat-affected zone of the large-constraint structural components, avoid or even eliminate the occurrence of reheat cracks in the welding heat-affected zones of the large-constraint structural components, and improve the quality of welded joints.

Description

technical field [0001] The invention relates to a method for controlling reheating cracks in a welding heat-affected zone of structural components with a large degree of restraint, and belongs to the technical field of welding of structural components with a major degree of restraint. Background technique [0002] The thermal power steam turbine valve manufactured by welding has a welded joint of a large thick-walled pipe butt welded structure. At the same time, the welded joint is constrained by the super gravity of the two sides of the body, and the heat-affected zone of the weld is prone to reheat cracks7, such as figure 1 shown. [0003] After welding, the near surface of welded structural components with certain constraints presents large welding residual stress. During post-weld heat treatment or high-temperature service, intergranular cracking is prone to occur in the position of the heat-affected zone of coarse grains. Although the microscopic mechanism of this crack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02
CPCB23K31/02B23K31/027
Inventor 熊建坤徐健杨林毛桂军杨建平张海波许德星黄丽赵鹏飞何芬周艳兵王大勇王喆刘友东郑亮亮吴博杨东
Owner DONGFANG TURBINE CO LTD
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