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Welding method for impeller locking bolt and locking pin

A technology for locking bolts and welding methods, which is applied in welding equipment, arc welding equipment, and greenhouse gas reduction, and can solve the problems of reduced impact toughness of joints, physical and mechanical properties of welded joints, and uneven chemical composition and metallographic structure. , to prevent delayed cracks, improve microstructure and mechanical properties, and eliminate welding residual stress

Active Publication Date: 2021-03-09
SHENYANG BLOWER WORKS GRP NUCLEAR PUMP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a welding method for impeller locking bolts and locking pins, to solve the problem of the impeller locking bolts made of martensitic stainless steel and the locking pins made of nickel-based alloys when welding. Large differences in physical and mechanical properties lead to uneven chemical composition and metallographic structure of welded joints, resulting in a decrease in impact toughness of the joints

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  • Welding method for impeller locking bolt and locking pin
  • Welding method for impeller locking bolt and locking pin
  • Welding method for impeller locking bolt and locking pin

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Embodiment Construction

[0022] see figure 1 The embodiment of the present invention provides a welding method for impeller locking bolts and locking pins, which is suitable for welding martensitic stainless steel and nickel-based alloy dissimilar steel when post-weld heat treatment cannot be achieved in the final assembly stage of the pump. The material of the impeller locking bolt is martensitic stainless steel, and the material of the locking pin is nickel-based alloy. The welding method includes the following steps:

[0023] Overlay the isolation layer with the same material as the locking pin on the impeller locking bolt and locking pin to be welded;

[0024] Perform post-weld heat treatment on the impeller locking bolts after the surfacing welding isolation layer;

[0025] Weld the isolation layer of the impeller locking bolts to the locking pins.

[0026] As a specific embodiment of the present invention, the impeller locking bolts are preheated at a temperature higher than 150° C. before wel...

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Abstract

The invention provides a welding method for an impeller locking bolt and a locking pin. The welding method comprises the following steps that an isolation layer with the same material as the locking pin is overlaid on the to-be-welded portion of the impeller locking bolt and the locking pin; postweld heat treatment is carried out on the impeller locking bolt after overlaying of the isolation layer; and the isolation layer of the impeller locking bolt is welded to the locking pin. The welding method for the impeller locking bolt and the locking pin can solve the problem that when the impeller locking bolt made of martensitic stainless steel and the locking pin made of nickel-based alloy are welded, chemical components and metallographic structures of a welded joint are uneven due to the fact that the physical performance and the mechanical performance of parent metal of the impeller locking bolt and the locking pin are greatly different, and therefore, the impact toughness of the jointis reduced.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a welding method for impeller locking bolts and locking pins. Background technique [0002] The impeller locking bolt of the main pump is made of martensitic stainless steel, and the locking pin is made of nickel-based alloy. The impeller locking bolt and locking pin are welded, that is, the welding of martensitic stainless steel and nickel-based alloy belongs to the metallographic structure. Welding of different dissimilar steels. Because the base metal of the impeller locking bolt and locking pin is quite different in terms of chemical composition and physical properties, the chemical composition and metallographic structure of the welded joint are not uniform, and the impact toughness of the welded joint is easily reduced. question. [0003] In addition, the weldability of martensitic stainless steel is poor, it has a strong tendency to harden, and the residual stress ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/167B23K9/20B23K9/235
CPCB23K9/167B23K9/04B23K9/20B23K9/235Y02E30/30
Inventor 田云王芳胡军谭俊哲刘亚玲孟艳玲刘文英王学宇张玉金袁林
Owner SHENYANG BLOWER WORKS GRP NUCLEAR PUMP
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