不同保护气成分对B10合金MIG/MAG焊接接头组织和性能的影响  

Effect on Microstructure and Properties of B10 Alloy MIG/MAG Welded Joints with Different Protective Gas Components

作　　者：刘甲 孙崇锋 陈利阳 雷小伟[1] 晏阳阳[1,2] 崔永杰 张浩[1] 郁炎[1,2] 韩茂盛 LIU Jia;SUN Chongfeng;CHEN Liyang;LEI Xiaowei;YAN Yangyang;CUI Yongjie;ZHANG Hao;YU Yan;HAN Maosheng(Luoyang Ship Material Research Institute,Luoyang 471023,Henan,China;National Key Laboratory of MarineCorrosion and Protection,Luoyang 471023,Henan,China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023 [2]海洋腐蚀与防护全国重点实验室,河南洛阳471023

出　　处：《焊管》2024年第12期38-43,共6页Welded Pipe and Tube

基　　金：国防基础科研项目资助(项目编号JCKY2021206B039)。

摘　　要：为了研究不同焊枪保护气对B10合金MIG/MAG焊接接头组织和性能的影响,在氩气中分别添加了氦气和二氧化碳气体,并对3种焊枪保护气体下B10合金MIG/MAG焊接试板进行了接头微观组织、力学性能、工艺性能、腐蚀性能等测试。结果表明:3种保护气体下的焊接接头的焊缝组织均为枝晶状α相,热影响区组织均为孪晶α相,无明显区别;接头抗拉强度平均值分别为344 MPa、345 MPa和339 MPa,断裂位置均发生在母材,均高于母材标准下限值;在弯心直径等于4倍试样厚度、弯曲角度为180°的条件下弯曲性能良好;焊缝及热影响区的硬度相较于母材均有所下降;3种保护气体下的焊接试样的均匀全浸腐蚀速率相近,但在海水冲刷腐蚀试验中,97.5%Ar+2.5%CO_(2)保护气体试样腐蚀量最高,99.99%Ar保护气体试样腐蚀量次之,80%Ar+20%He保护气体试样腐蚀量最小。In order to study the effects of different welding torch shielding gases on the microstructure and properties of B10 alloy MIG/MAG welded joints,helium and carbon dioxide gas were added to argon,and the microstructure,mechanical properties,technological properties and corrosion properties of B10 alloy MIG/MAG welded plates under three kinds of welding torch shielding gases were tested.The results show that the weld microstructure of the welded joints under the three shielding gases is dendriticα⁃phase,and the heat⁃affected zone microstructure is twinnedα-phase,with no obvious difference.The average tensile strength of the joint is 344 MPa,345 MPa and 339 MPa,respectively,and the fracture locations of the joint occurs in the base metal,which is higher than the standard lower limit value of the base metal.Under the condition that the bending radius is equal to 4 times the thickness of the specimen and the bending angle is 180°,the bending performance is good.The hardness of the weld and heat affected zone is lower than that of the base metal.The uniform full immersion corrosion rates of the welded specimens under the three protective gases are similar,but in the seawater erosion corrosion test,the corrosion amount of the 97.5%Ar+2.5%CO_(2)welding protective gas is the highest,the corrosion amount of the 99.99%Ar welding protective gas is the second,and the 80%Ar+20%He welding protective gas has the smallest corrosion amount.

关 键 词：MIG焊接 MAG焊接 B10合金 微观组织 力学性能 

分 类 号：TG444.2[金属学及工艺—焊接]