不锈钢超高频直流脉冲GTAW焊缝成形行为  

Weld appearance behavior in welding pool of stainless steel by ultrahigh frequency pulse GTAW process

作　　者：杨明轩[1] 齐铂金[1] 从保强[1] 李伟[1,2] 杨舟[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191 [2]北京石油化工学院电气工程系,北京102617

出　　处：《焊接学报》2012年第11期31-34,114,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50975015)

摘　　要：基于超高频直流脉冲钨极氩弧焊技术(UHF-GTAW,ultrahigh frequency pulse-gas tungsten arc welding),完成了0Cr18Ni9Ti奥氏体不锈钢焊缝熔透特性试验,研究分析了超高频脉冲方波电流对焊缝成形及熔池金属流动的影响规律.结果表明,在高频脉冲电流作用下,熔透率随频率增加而增大,在同等平均电流条件下,当脉冲频率达到80 kHz时,熔宽减小,熔深最大增加了88.7%,熔透率显著提升,至少增大了24.6%以上.结合试验数据对熔池流动行为进行了理论分析,讨论了熔池内部电磁力对焊缝成形的作用及对流体的驱动效果.Based on ultrahigh frequency pulse gas tungsten arc welding process for stainless steel,appearance of weld and the influence of pulse current to flow in welding pool were carried out.The experimental results show that the welds penetration increased with the increasing of pulse frequency.When the pulse frequency f=80 kHz,the weld penetration rose by 24.6% at least with the depth increased by 88.7% at most.It could also be found that the width and depth of weld had the similar trend with the changed pulse frequency.Based on the data from experiments,the flow movement in the pool was investigated with effect of electromagnetic force to weld appearance and forced flow as the main purpose.

关 键 词：超高频直流脉冲GTAW 焊缝成形 熔池流动行为 

分 类 号：TG403[金属学及工艺—焊接]