Study on All-position Automatic TIG Welding Technology for Dissimilar Joints of Nickel-based Alloy and Stainless Steel

LI Yang; XU Muzhong; LIU Zigang; DAI Fengxian; LI Xinhua; XING Li

doi:10.7512/j.issn.1001-2303.2025.03.11

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Study on All-position Automatic TIG Welding Technology for Dissimilar Joints of Nickel-based Alloy and Stainless Steel
Vol. 55, Issue 3, Pages: 82-87(2025)
Received：05 March 2024，

Revised：2024-04-11，

Published：20 March 2025
DOI： 10.7512/j.issn.1001-2303.2025.03.11
稿件说明：

移动端阅览

李洋，徐睦忠，刘自刚，等.镍基合金与不锈钢异种焊接接头全位置自动TIG焊接工艺研究［J］.电焊机，2025，55（3）：82-87. DOI： 10.7512/j.issn.1001-2303.2025.03.11.

LI Yang, XU Muzhong, LIU Zigang, et al.Study on All-position Automatic TIG Welding Technology for Dissimilar Joints of Nickel-based Alloy and Stainless Steel[J].Electric Welding Machine, 2025, 55(3): 82-87. DOI： 10.7512/j.issn.1001-2303.2025.03.11.

摘要

针对核反应堆压力容器与主管道安全端异种金属（SA508 Gr.3 Cl.1/SA182 Gr.F316LN）对接焊缝的制造需求，系统研究全位置自动TIG焊接工艺特性。通过对比多层单道焊（钨极摆动）与多层多道焊（钨极不摆动）的工艺效果发现：多层多道焊制备的焊缝未检出失塑裂纹（DDC），无损检测合格率达100%，室温拉伸强度达665 MPa，350 ℃高温拉伸强度为547 MPa，冲击功最高达245 J（V型缺口），8件弯曲试样均无缺陷；而多层单道焊试样焊缝中呈现多处100~200 μm级DDC裂纹。试验表明，多层多道焊通过控制热输入（峰值电流180~230 A，送丝速度70~130 cm/min）和焊道排布优化，可显著降低镍基焊缝的裂纹敏感性，接头硬度分布均匀（180~211 HV），晶间腐蚀测试无开裂倾向，综合性能优于核电标准要求，为大厚度异种金属结构工程化焊接提供了技术支撑。

Abstract

To address the manufacturing requirements of dissimilar steel (SA508 Gr.3 Cl.1/SA182 Gr.F316LN) butt welds between reactor pressure vessels and main pipeline safe-ends

this study systematically investigates the characteristics of all-position automatic TIG welding processes. Comparative analysis of multi-layer single-pass welding (with tungsten oscillation) and multi-layer multi-pass welding (without tungsten oscillation) reveals that: The multi-layer multi-pass welded joints exhibit no detectable ductility-dip cracking (DDC)

achieve 100% nondestructive testing compliance

demonstrate room-temperature tensile strength of 665 MPa and high-temperature tensile strength of 547 MPa at 350 °C

with maximum impact energy reaching 245 J (V-notch). All eight bending specimens show defect-free performance. In contrast

multiple 100~200 μm-scale DDC cracks were observed in multi-layer single-pass welded specimens. Experimental results confirm that multi-layer multi-pass welding effectively reduces crack susceptibility in nickel-based welds through controlled heat input (peak current 180-230 A

wire feed speed 70~130 cm/min) and optimized bead arrangement

producing uniform hardness distribution (180~211 HV) and no intergranular corrosion cracking tendency. The comprehensive performance exceeds nuclear power standards

providing critical data support for engineering applications of thick-walled dissimilar steel structures.

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references

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