Microstructure and performances of twin-electrode gas tungsten arc weld for dissimilar metals of stainless steel and low alloy steel

FANG Disheng; GAO Yongguang; LIU Wancun; LI Zhijie

doi:10.7512/j.issn.1001-2303.2020.03.16

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Microstructure and performances of twin-electrode gas tungsten arc weld for dissimilar metals of stainless steel and low alloy steel
Vol. 50, Issue 3, Pages: 86-91(2020)
DOI： 10.7512/j.issn.1001-2303.2020.03.16

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FANG Disheng, GAO Yongguang, LIU Wancun, et al. Microstructure and performances of twin-electrode gas tungsten arc weld for dissimilar metals of stainless steel and low alloy steel. [J]. 50(3):86-91(2020)
DOI：

FANG Disheng, GAO Yongguang, LIU Wancun, et al. Microstructure and performances of twin-electrode gas tungsten arc weld for dissimilar metals of stainless steel and low alloy steel. [J]. 50(3):86-91(2020) DOI： 10.7512/j.issn.1001-2303.2020.03.16.

摘要

采用双钨极高效焊接方法在低合金钢表面堆焊不锈钢,详细分析焊缝稀释率、微观组织、异种金属过渡区Ⅱ型边界、马氏体带等现象,并检测了堆焊层化学成分、硬度、冲击、晶间腐蚀等性能。结果表明,随着热输入的增加,双钨极焊缝稀释率增加,微观组织晶粒尺寸增大,Ⅱ型边界迁移距离更远,马氏体带局部变长。当双钨极热输入控制在一定程度时,其硬度、化学、冲击、晶间腐蚀等焊缝性能与单钨极接近;但当双钨极热输入过高时,双钨极焊缝硬度、冲击等性能明显恶化。

Abstract

Twin-electrode gas tungsten arc（TE-GTA）welding is applied to clad stainless steel on low alloy steel. The dilution rate, microstructure,type II boundary, martensite zone of the welds are analyzed. The chemical composition,hardness,impact and inter-granular corrosion of surfacing layer are tested. The results show that as the heat input increases,dilution rate and grain size increase, type II boundary migrates further,and the martensite zone grow larger. When the heat input is constrained,the mechanical performances of TE-GTA welds are similar to those of single GTA. But when the heat input is excessive,the weld performances obviously deteriorate.

关键词

双钨极不锈钢堆焊组织与性能

Keywords

twin-electrode gas tungsten arcstainless steel surfacingmicrostructure and performances

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