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Welding method of impeller locking bolt and locking pin

A technology for locking bolts and welding methods, applied in welding equipment, arc welding equipment, reducing greenhouse gases, etc., can solve the problems of reduced impact toughness of joints, uneven chemical composition and metallographic structure of welded joints in physical and mechanical properties, etc. , to prevent delayed cracks, improve microstructure and mechanical properties, and reduce hardness

Active Publication Date: 2022-07-12
SHENYANG BLOWER WORKS GRP NUCLEAR PUMP +1
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  • 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 of impeller locking bolt and locking pin
  • Welding method of impeller locking bolt and locking pin
  • Welding method of impeller locking bolt and locking pin

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Embodiment Construction

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

[0023] The isolation layer of the same material as the locking pin is surfacing on the impeller locking bolt and the locking pin to be welded;

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

[0025] Weld the spacer of the impeller lock bolt to the lock pin.

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

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Abstract

The invention provides a welding method for impeller locking bolts and locking pins. The impeller locking bolt after the layer is subjected to post-weld heat treatment; the isolation layer of the impeller locking bolt is welded with the locking pin. The welding method of the impeller locking bolt and the locking pin provided by the present invention 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, due to the physical properties of the two base metals There is a big difference between the mechanical properties and the chemical composition of the welded joints and the metallographic structure is not uniform, thereby reducing the impact toughness of the joints.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a welding method of an impeller locking bolt and a locking pin. 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. Welding the impeller locking bolt and locking pin, that is, the welding of martensitic stainless steel and nickel-based alloy, belongs to the metallographic structure. Welding of different dissimilar steels. Since the base metal of the impeller locking bolt and the locking pin are quite different in terms of chemical composition and physical properties, the chemical composition and metallographic structure of the welded joint are not uniform, which easily leads to a decrease in the impact toughness of the welded joint, etc. question. [0003] In addition, the weldability of martensitic stainless steel is poor, it has a strong tendency to harden, an...

Claims

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Application Information

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Patent Type & Authority Patents(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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