20钢管A-TIG大钝边打底焊法  

Largeblunt edge root welding method for A-TIG of 20 steel pipe

作　　者：张丹丹 张治国 庞启 ZHANG Dandan;ZHANG Zhiguo;PANG Qi(Mechanical and Electrical Engineering,Longnan Teachers College,Longnan 742500,Gansu,China)

机构地区：[1]陇南师范高等专科学校机电工程学院,甘肃省陇南市742500

出　　处：《四川冶金》2024年第4期25-29,共5页Sichuan Metallurgy

基　　金：2023年甘肃省高校教师创新基金项目(2023B-415);甘肃省陇南市2022年科技计划项目(2022-S·JH-09);2021年陇南师范高等专科学校校级教学改革重点项目(JXGG2021009)。

摘　　要：利用手工A-TIG焊对20钢管进行了大钝边打底焊研究。钝边尺寸及装配间隙合理时,在适当工艺参数支持下,可实现活性TIG焊全位置大钝边打底焊接。活性剂作用下熔池表面张力方向的改变是影响A-TIG全位置大钝边打底焊成型的重要因素。平焊位置,内表面张力σ_(2)是平衡向下的重力G与电弧力F_(a)的重要作用力;立焊位置,内表面张力σ_(2)是平衡水平电弧力Fa主要作用力;仰焊位置,外表面张力σ_(1)与内表面张力σ_(2)是克服重力G的重要作用力。A study was conducted on the large blunt edge root welding of 20 steel pipes using manual A-TIG welding.When the size of the blunt edge and the assembly gap are reasonable,with the support of appropriate process parameters,A-TIG welding with full position large blunt edge root can be achieved.The change in surface tension direction of the molten pool under the action of an activator is an important factor affecting the formation of A-TIG full position large blunt edge root welding.In the flat welding position,the inner surface tensiono σ_(2) is the important force that balances the downward gravity G and the arc force F_(a);At the vertical welding position,the inner surface tensiono σ_(2) is the main force that balances the horizontal arc force Fa;At the overhead welding position,the outer surface tension σ_(1),Internal surface tension σ_(2) is an important force to overcome gravity G.

关 键 词：活性TIG焊 大钝边 打底焊 全位置 

分 类 号：TG444[金属学及工艺—焊接]