摘要
采用非熔化极惰性气体保护焊(Tungsten Inert Gas,TIG)工艺,在焊接电流为90~120 A条件下,分别选用直径为Φ2. 0 mm的ER309焊丝和Ni317焊丝对0Cr18Ni9奥氏体不锈钢和Q235碳钢进行双面焊。对各个参数条件下焊后的接头分别进行金相组织观察、拉伸性能测试及断口形貌分析,分析焊丝和焊接电流对焊接接头的组织与性能的影响。实验表明,采用高镍焊丝Ni317时,焊缝组织中奥氏体成分大大增加;采用同种焊丝,当焊接电流在90~120 A区间变化时,随着电流增加,接头的抗拉强度增大,拉伸断口均出现韧窝,且ER309焊丝得到的韧窝尺寸大而深;采用同种电流时,采用ER309焊丝的接头的抗拉强度要高于采用Ni317焊丝接头。
The tungsten inert gas shielded(TIG)welding process was used to weld the joint of 0Cr18Ni9 austenitic stainless steel and Q235 carbon steel withΦ2.0 mm diameter ER309 wire and Ni317 wire respectively under the welding current of 90-120 A from both sides.The metallographic structure observation,tensile test and fracture morphology analysis of the joints welded under different parameters were carried out.The effects of welding wires and welding currents on the microstructure and properties of welded joints were analyzed.The experiments show that when high nickel welding wire Ni317 is used,austenite content in the weld line structure is greathy increased;with the same welding wire,when the welding current changes from 90 to 120 A,the tensile strength of the joint increases with the increase of welding current,dimples appear on the tensile fracture surface,and ER309 welding wire is easier to get large and deep dimples;with the same welding current,tensile property of the joints welded by ER309 welding wire is better than that of the joints welded by Ni317 welding wire.
作者
陈今良
CHEN Jin-liang(College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第3期179-184,共6页
Journal of Plasticity Engineering
基金
攀枝花学院校级项目(2013YB029)
攀枝花学院创新训练资助项目(2018cxcy004)
关键词
TIG焊接
拉伸测试
异种金属
断口形貌
TIG welding
tensile test
dissimilar metal
fracture morphology
