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Stainless steel composite steel part end welding process

A welding process and technology for steel parts, applied in manufacturing tools, welding equipment, laser welding equipment, etc., can solve problems such as large expansion coefficient, overheating cracks, stress corrosion, etc., and achieve improved mechanical properties, plastic deformation, and improved melting. deep effect

Active Publication Date: 2021-12-10
江苏众信绿色管业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large expansion coefficient, poor thermal conductivity, and variability in the welding process, problems such as intergranular corrosion, stress corrosion, and overheating cracks are prone to occur. In order to improve the weldability and corrosion resistance of 18-8 austenitic stainless steel and prevent cracks generation, control welding deformation, this application proposes a welding process for stainless steel composite steel parts, which greatly improves the quality of welds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A welding process for the end of a stainless steel composite steel part, comprising the following welding steps:

[0025] 1) Clean the steel parts to be welded, open the groove at the end, the opening distance at the bottom of the groove is 2mm, the equidistant depth of the bottom opening is 2mm, and the angle of the groove is 60°. After cleaning, activate the groove;

[0026] 2) Select welding rods and use all-position multi-layer and multi-pass welding;

[0027] 3) YAG-MAG laser arc hybrid welding is adopted, and bottom welding is performed first, using YJ502CrNiCu(Q) as the welding core, the mass ratio of welding core and coating is 65:35, the welding parameters are, laser power 1600W, arc current 110A, The inclination angle of welding wire is 45°;

[0028] Then carry out transition layer welding, using DY-YA309 (Q) as the welding core, the mass ratio of welding core and coating is 65:35, the welding parameters are, laser power 1400W, arc current 100A, welding wire ...

Embodiment 2

[0037] A welding process for the end of a stainless steel composite steel part, comprising the following welding steps:

[0038] 1) Clean the steel parts to be welded, open the groove at the end, the opening distance at the bottom of the groove is 2mm, the equidistant depth of the bottom opening is 3mm, and the angle of the groove is 60°. After cleaning, activate the groove;

[0039] 2) Select welding rods and use all-position multi-layer and multi-pass welding;

[0040] 3) YAG-MAG laser arc hybrid welding is adopted, and bottom welding is performed first, using YJ502CrNiCu(Q) as the welding core, the mass ratio of welding core and coating is 65:35, the welding parameters are, laser power 1500W, arc current 120A, The inclination angle of welding wire is 50°;

[0041] Then carry out transition layer welding, using DY-YA309 (Q) as the welding core, the mass ratio of welding core and coating is 65:35, welding parameters are, laser power 1400W, arc current 120A, welding wire incl...

Embodiment 3

[0050] A welding process for the end of a stainless steel composite steel part, comprising the following welding steps:

[0051] 1) Clean the steel parts to be welded, open the groove at the end, the opening distance at the bottom of the groove is 2mm, the equidistant depth of the bottom opening is 2mm, and the angle of the groove is 50°. After cleaning, activate the groove;

[0052] 2) Select welding rods and use all-position multi-layer and multi-pass welding;

[0053] 3) YAG-MAG laser arc hybrid welding is adopted, and bottom welding is performed first. YJ502CrNiCu(Q) is used as the welding core, the mass ratio of welding core and coating is 65:38, and the welding parameters are: laser power 1400W, arc current 100A, The inclination angle of welding wire is 50°;

[0054] Then carry out transition layer welding, using DY-YA309 (Q) as the welding core, the mass ratio of welding core and coating is 65:35, welding parameters are, laser power 1300W, arc current 120A, welding wir...

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Abstract

The invention provides a stainless steel composite steel part end welding process. The process comprises the following welding steps of cleaning a steel part to be welded, beveling the end, and activating the beveled edge after cleaning; selecting welding rods, and adopting all-position multi-layer and multi-pass welding; adopting YAG-MAG laser arc hybrid welding, and sequentially conducting backing welding, transition layer welding and outer layer welding; and conducting annealing treatment and acid pickling on welded products to obtain finished products. According to the process, the welding process steps and parameter setting are reasonably optimized, welding seams are compact and smooth, the defects of air holes, undercuts and the like are avoided, the formed welding seam metal structure is uniform and stable, the mechanical property of a welding head is remarkably improved, and the process is efficient and practical.

Description

technical field [0001] The invention relates to the technical field of production and processing of stainless steel composite steel parts, in particular to an end welding process of stainless steel composite steel parts. Background technique [0002] Stainless steel is based on ordinary carbon steel, adding more than 12% Cr, it can maintain metallic luster under the action of air, that is, it has the characteristics of not rusting, and the steel that can resist corrosion in air or weak medium is ordinary Stainless steel, and the steel that can resist corrosion in some strong corrosive media is corrosion-resistant steel. [0003] Austenitic stainless steel is the most important steel type in stainless steel, and its production and usage account for about 70% of the total production and usage of stainless steel. This type of steel is a very good material with excellent corrosion resistance and biophase Capacitance, so it is widely used in chemical industry, coastal, food, bio...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K26/60B23K26/70C21D1/26C21D9/50
CPCB23K26/348B23K26/60B23K26/70C21D9/50C21D1/26
Inventor 孟宪虎贺忠臣周永刚
Owner 江苏众信绿色管业科技有限公司
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