低合金钢Q345的深熔TIG焊研究  

Study on the Deep Penetration TIG Welding of Q345 Steel

作　　者：樊文飞[1,2] 罗震[1,2] 冯悦峤 李洋 敖三三[1,2] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《上海交通大学学报》2016年第S1期102-105,共4页Journal of Shanghai Jiaotong University

基　　金：高等学校博士学科点专项科研基金(20130032110004);国家自然科学基金面上项目(51275342);国家自然科学基金面上项目(51275338);国家自然科学基金青年项目(51405335)

摘　　要：针对8 mm厚Q345低合金钢的深熔TIG焊中焊接电流、焊接速度、保护气体流量对Q345焊缝成型的影响进行了研究,并对成型较好的焊接接头进行了硬度测试和金相观察.试验结果表明,虽然深熔TIG焊在对低合金钢焊接时的焊接参数不稳定,焊接窗口较窄,不易形成良好的焊缝.但在适当的焊接条件下,可以实现深熔TIG焊对8mm厚Q345的一次性单面焊双面成型,焊缝性能较好并且成型良好的焊缝区组织由铁素体和少量针状贝氏体组成,焊缝熔合区和热影响区的硬度较母材上升了50%,无软化现象.具有继续研究深熔TIG焊应用于低合金钢Q345的意义.This paper studies the deep penetration TIG welding of Q345 steel plate with 8mm thickness.The effects of welding current,welding speed,gas flow rate on the weld appearance were investigated.The microstructure and mechanical properties of the weld joint made by the optimized welding parameters was studied.The results show that the parameters of the welding are not stable.The fusion zone of the weld joint with good performance consisted of low-carbon martensite and needle-like or feathery bainite.The hardness of fusion zone is increased by 50%than that of base metal.This indicated that the one-side welding with double-sided shaping of 8 mm thickness Q345 steel can be realized by the deep penetration TIG welding.

关 键 词：深熔TIG焊 低合金钢 力学性能 金相组织 

分 类 号：TG453.9[金属学及工艺—焊接]