焊管2024，Vol.47Issue(4)：25-31,7.DOI:10.19291/j.cnki.1001-3938.2024.04.004
焊接热输入量和保护气体成分对S32205双相不锈钢低温冲击韧性的影响
Effect of Welding Heat Input and Shielding Gas Composition on Low Temperature Impact Toughness of S32205 Duplex Stainless Steel
摘要
Abstract
The plasma arc welding(PAW)+ gas tungsten arc welding(GTAW)technology is used to weld 2205 duplex stainless steel.During GTAW welding process,the effects of heat input and shielding gas on the low-temperature impact toughness of the material welding site are studied,and through metallographic and SEM analysis the microstructure are analyzed.The results show that the heat input can affect the morphology and the proportion of austenitic and ferrite grains during GTAW welding.When the heat input is 1.76 kJ/cm,the low temperature(-46℃)impact performance of the welding part is the best.The addition of N2 in the protective gas will affect the proportion of austenite and ferrite and the precipitation amount of CrN/Cr2N in the ferrite.It may lead to the formation of microvoids.When the addition amount of N2 is 1%,the low temperature(-46℃)impact performance of the welding site is the best.关键词
2205双相不锈钢/钨极惰性气体保护焊/低温冲击韧性/金相分析Key words
2205 duplex stainless steel/gas tungsten arc welding(GTAW)/low temperature impact toughness/metallographic analysis分类
金属材料引用本文复制引用
徐阿敏,吉海,许全光,吕越,沈强..焊接热输入量和保护气体成分对S32205双相不锈钢低温冲击韧性的影响[J].焊管,2024,47(4):25-31,7.基金项目
湖州市公益性应用研究项目"S32750超级双相不锈钢管低温韧性的影响因素研究及加工工艺优化"(项目编号2021GZ03). （项目编号2021GZ03）
