Method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel

A corrosion-resistant, stainless steel technology, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problem of decreased stress corrosion resistance of welds, increased stress corrosion cracking tendency, refractory oxide precipitation tendency, oxygen content Increase and other problems, to achieve the effect of reducing ferrite content, facilitating industrial application, and increasing nitrogen content

Active Publication Date: 2021-12-21
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although O 2 or CO 2 Promote arc ionization and enhance arc stability, but these gases will decompose in the high-temperature arc column area, resulting in a large number of micropores inside the weld, and a large increase in oxygen content, resulting in a decrease in the stress corrosion resistance of the weld, and an increase Stress corrosion cracking tendency and precipitation tendency of refractory oxides such as Mn and Si during service

Method used

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  • Method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel
  • Method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel
  • Method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Grind the piece to be welded and clean it with alcohol or acetone, fix it on the workbench, and use a laser beam assisted welding torch to weld the piece to be welded in MIG welding under the atmosphere of protective gas. The composition of the protective gas is argon A mixture of gas and nitrogen, the gas flow ratio of argon and nitrogen is 22.5:2.5, the energy of the laser beam is 0.6KW, in the MIG welding process, the arc generated by the MIG welding torch is in front, and the laser beam is behind the welding method Do the welding. The material to be welded is Cr-Ni stainless steel.

Embodiment 2

[0054] Grind the piece to be welded and clean it with alcohol or acetone, fix it on the workbench, and use a laser beam assisted welding torch to weld the piece to be welded in MIG welding under the atmosphere of protective gas. The composition of the protective gas is argon A mixture of gas and nitrogen, the gas flow ratio of argon and nitrogen is 20:5, and the energy of the laser beam is 1.2KW. During the MIG welding process, the arc generated by the MIG welding torch is in the front, and the laser beam is behind the welding method Do the welding. The material to be welded is Cr-Ni stainless steel.

Embodiment 3

[0056] Grind the piece to be welded and clean it with alcohol or acetone, fix it on the workbench, and use a laser beam assisted welding torch to weld the piece to be welded in MIG welding under the atmosphere of protective gas. The composition of the protective gas is argon A mixture of gas and nitrogen, the gas flow ratio of argon and nitrogen is 17.5:7.5, the energy of the laser beam is 1.5KW, in the MIG welding process, the arc generated by the MIG welding torch is in the front, and the laser beam is behind the welding method Do the welding. The material to be welded is Cr-Ni stainless steel.

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Abstract

The invention belongs to the related technical field of Cr-Ni series stainless steel welding, and discloses a method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel. The method comprises the steps that in the protective gas atmosphere, a to-be-welded piece is welded through laser beam assisted MIG electric arcs during MIG welding, wherein the protective gas is mixed gas of inert gas and nitrogen, the gas flow ratio of the inert gas to the nitrogen is 22.5:2.5-17.5:7.5, and the energy of the laser beam is 0.6-1.5 KW, so that the laser irradiates the surface of the to-be-welded piece to generate metal steam to provide stable cathode spots for MIG electric arcs to promote MIG electric arc ionization; and meanwhile, the nitrogen is subjected to ionization reaction, so that the nitrogen content of a molten pool is increased, then the solidification temperature interval of an austenite phase is expanded, transformation from ferrite to austenite is accelerated, and the corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field related to welding of Cr-Ni series stainless steel, and more specifically relates to a method and a device for improving the corrosion resistance of Cr-Ni series stainless steel by MIG welding. Background technique [0002] Cr-Ni stainless steel has become an important material in the fields of nuclear power, ships and pipeline transportation due to its good corrosion resistance and mechanical properties. In the welding of Cr-Ni stainless steel such as nuclear power pipelines and pressure vessels, in order to avoid stress corrosion cracking in the weld and heat-affected zone and reduce the crack growth rate at the weld, it is stipulated that welding should be performed in pure argon or non-oxidizing atmosphere. . When MIG welding Cr-Ni stainless steel in pure Ar atmosphere, the stability of the arc will be affected due to the drifting back and forth of the cathode spots on the surface. [0003] In the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/12B23K26/348B23K26/60B23K26/08B23K26/70
CPCB23K26/123B23K26/348B23K26/60B23K26/08B23K26/70
Inventor 郑志镇仲杨李建军张华
Owner HUAZHONG UNIV OF SCI & TECH
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