摘要
常规的高能束焊接方法因焊后冷速较快易导致双相不锈钢焊缝及热影响区两相比例失衡,接头性能恶化.采用激光-MIG复合焊接方法对2205双相不锈钢进行焊接,焊后对接头微观组织、力学性能和腐蚀性能分析发现,焊缝及热影响区铁素体相比例控制在40%～70%合理范围内,接头硬度和抗拉强度高于母材,焊缝、熔合线、热影响区的-40℃冲击韧度分别为73,205,190 J/cm2,焊缝临界点蚀温度为49℃,与母材相近.结果表明,2205双相不锈钢采用激光-MIG复合焊接方法可获得综合性能良好的接头.
Phase ratio in weld metal and heat affected zone of duplex stainless steel will be unbalanced and joint properties deteriorated because of fast cooling rate after welding by conventional high energy density beam,so the duplex stainless steel 2205 is welded by using laser-MIG hybrid welding method,and the microstructure,mechanical property and corrosive property of welded joint are analyzed.The results show that the phase ratio of ferrite in weld metal and heat-affected zone is controlled between 40%-70%,the microhardness and tensile strength of the joint are higher than those of base metal,the impact toughness of weld metal,fusion line and heat-affected zone at-40 ℃ is 73,205,190 J/cm2 respectively,and the critical pitting temperature(CPT) of weld bead is 49 ℃,near the same as that of base metal.So the good joint performance of duplex stainless steel 2205 can be obtained by laser-MIG hybrid welding.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第2期105-108,118,共4页
Transactions of The China Welding Institution
基金
上海市高新技术产业化基金资助项目
关键词
双相不锈钢
复合焊接
微观组织
力学性能
临界点蚀温度
duplex stainless steel
hybrid welding
microstructure
mechanical property
critical pitting temperature
