Microstructure and Properties of SUS301L/Q450NQR1 Dissimilar Joints Welded by Laser-MIG Hybrid Welding with Different Welding Wires

QIU Peixian; DENG Hongjian; CHEN Beiping; ZHANG Wenyuan; SUN Zhongwen; ZHU Zongtao; HE Shaoxiong

doi:10.7512/j.issn.1001-2303.2025.01.14

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Microstructure and Properties of SUS301L/Q450NQR1 Dissimilar Joints Welded by Laser-MIG Hybrid Welding with Different Welding Wires
Vol. 55, Issue 1, Pages: 101-107(2025)
Received：25 February 2024，

Revised：2024-10-11，

Published：20 January 2025
DOI： 10.7512/j.issn.1001-2303.2025.01.14
稿件说明：

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邱培现，邓鸿剑，陈北平，等.不同焊丝激光-MIG复合焊接SUS301L/Q450NQR1异种钢接头的组织及性能［J］.电焊机，2025，55（1）：101-107. DOI： 10.7512/j.issn.1001-2303.2025.01.14.

QIU Peixian, DENG Hongjian, CHEN Beiping, et al.Microstructure and Properties of SUS301L/Q450NQR1 Dissimilar Joints Welded by Laser-MIG Hybrid Welding with Different Welding Wires[J].Electric Welding Machine, 2025, 55(1): 101-107. DOI： 10.7512/j.issn.1001-2303.2025.01.14.

摘要

为了降低成本，采用ER309LSi和CHW-55CNH两种不同焊丝，利用激光-MIG复合焊对Q450NQR1和SUS301L钢板进行对接焊，对比研究了两种焊丝接头的组织与性能。结果表明：两种焊丝接头均无未焊透、未熔合等缺陷，焊缝表面呈明显的鱼鳞纹；ER309LSi焊丝接头焊缝中心区主要为树枝状结晶的奥氏体以及少量铁素体组成；CHW-55CNH焊丝接头焊缝中心区主要由先共析铁素体以和珠光体组成；CHW-55CNH焊丝接头焊缝硬度（374 HV）大于ER309LSi焊丝接头（217 HV）；ER309LSi焊丝接头平均抗拉强度（632.3 MPa）略大于CHW-55CNH焊丝接头（608.6 MPa）；两种焊丝接头的中性盐雾腐蚀试验结果相差不大，电化学分析试验结果表明ER309LSi焊丝接头的耐蚀性优于CHW-55CNH焊丝接头。综上，当构件受力或耐蚀性要求不严格的时候，可以用价格较低的CHW-55CNH焊丝替代ER309LSi焊丝。

Abstract

In order to reduce the cost

two different welding wires

ER309LSi and CHW-55CNH

were used to weld Q450NQR1/SUS301L dissimilar steel plate by laser-MIG hybrid welding. The microstructure and properties of the weld joints obtained by the two different welding wires were compared. The results show that the weld seams obtained by the two welding wires have no defects such as incomplete penetration and fusion

and the surface of the weld seams has obvious fish scale patterns; the center area of the weld seam obtained by ER309LSi welding wire is mainly composed of dendritic austenite and a small amount of ferrite

while the central area of the weld seam obtained by CHW-55CNH welding wire is mainly composed of proeutectoid ferrite and pearlite; the hardness value of the weld seam obtained by CHW-55CNH welding wire (374 HV) is greater than that of the weld seam obtained by ER309LSi welding wire (217 HV); the average tensile strength of the weld joint obtained by ER309LSi welding wire (632.3 MPa) is slightly larger than that of the weld joint obtained by CHW-55CNH welding wire (608.6 MPa); the neutral salt spray corrosion test of the two welding wire joints are not much different; the electrochemical analysis test shows that the corrosion resistance of ER309LSi welding wire joint is better than that of CHW-55CNH welding wire joint. In conclusion

the CHW-55CNH welding wire with lower price can replace the ER309LSi welding wire when the stress or the corrosion resistance requirements of components are not strict.

关键词

Keywords

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