摘要
为了研究保护气体对奥氏体不锈钢焊接接头力学性能的影响,在相同线能量条件下对加保护气体与不加保护气体两种焊接方式进行了对比研究。采用Nd:YAG激光器对厚度为0.7 mm的奥氏体不锈钢进行激光焊接,用扫描电子显微镜、显微硬度计、材料试验机等仪器对焊接接头的微观组织及力学性能进行表征及测试。结果表明,在相同的激光工艺参数下,两种焊接方式均实现完全焊透,且焊缝成型良好。不加保护气体时,随着焊接速度的降低,接头抗拉强度随之降低,最多降低了20%。加入保护气体后,接头的抗拉强度变化平稳,均为母材强度的90%以上。
In order to study the effect of shielding gas on mechanical properties of austenitic stainless steel welding joint, a comparison between weld with shielding gas and weld with no shielding gas in the same line energy is studied. Austenitic stainless steel in 0.7 mm thick is welded by using Nd：YAG laser, the microstructure and mechanical properties of the welding joint are analyzed by means of scanning electron microscope （SEM）, micro-hardness tester and material testing machine. Results show that two types of welding both achieve full penetration, and have good weld-forming in the same laser processing parameters. When welding with no shielding gas, with the decrease of welding speed, the tensile strength of welded joints also decrease. The decrease rate reaches 20% at most. After adding shielding gas, the tensile strength of welded joints changes smoothly, all tensile strength are over 90% of matrix.
出处
《激光与光电子学进展》
CSCD
北大核心
2014年第5期122-127,共6页
Laser & Optoelectronics Progress
基金
吉林省科技支撑计划重点项目(20120353)
关键词
激光技术
激光焊接
奥氏体不锈钢
保护气体
抗拉强度
laser technique
laser welding
austenitic stainless steel
shielding gas
tensile strength
