双TIG活性电弧焊接工艺  

Two-TIG activating arc welding process

作　　者：张佳[1,2] 郭超 邵沛泽 王新鑫 樊丁 Zhang Jia;Guo Chao;Shao Peize;Wang Xinxin;Fan Ding(Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Engineering Research Center of Higher Education Institutions for Special Welding Materials and Technology,Chongqing 400054,China;Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]重庆理工大学,重庆400054 [2]重庆市特种焊接材料与技术高校工程研究中心,重庆400054 [3]兰州理工大学,兰州730050

出　　处：《焊接》2022年第7期1-5,27,共6页Welding & Joining

基　　金：国家自然科学基金资助项目(51705054);重庆市教委科学技术研究项目(KJQN202101135)。

摘　　要：提出双TIG活性电弧焊接方法,采用2支TIG焊枪前后排布,前置焊枪的焊接电流小于后置焊枪,且在前置焊枪保护气中混入少量O_(2),使电弧具有活性。对5 mm厚SUS304奥氏体不锈钢板进行焊接工艺试验。结果表明,与相同条件下的TIG焊接相比,双TIG活性电弧焊接焊缝熔深明显增加,焊缝表面成形良好;随着O_(2)流量的增加,焊缝熔深先增加后减小,焊缝熔宽先减小后增加;在保持总电流不变的情形下,随着后置焊枪电流增加(前置焊枪电流减小),焊缝熔深先增加后减小,焊缝熔宽持续增加;随着弧长的增加,焊缝熔深先增加后减小,焊缝熔宽逐渐增加;当钨极间距从3 mm开始增加时,焊缝熔深逐渐减小,熔宽逐渐增加;而随着焊接速度的增加,焊缝熔深和熔宽都减小。O的混入对焊缝组织无明显影响。相比母材而言,焊缝冲击韧性有所下降。该方法能在高于普通TIG焊接速度的条件下实现深熔焊接。Two-TIG activating arc welding process was proposed.Two TIG welding guns were used in a front-to-back arrangement,current of the front welding gun was less than that of the back welding gun and the front welding gun made the arc activating by being mixed with minor O_(2).Welding procedure test of 5 mm thick SUS304 austenitic stainless steel plate was carried out.The results showed that compared to traditional TIG welding under the same conditions,penetration of two-TIG activating arc welding significantly increased,and surface of the weld was well formed.With the increase of O_(2)flow,penetration first increased and then decreased,while weld width first decreased and then increased.At the same welding current,as the back welding gun’s current increased and the front welding gun’s current decreased,penetration first increased and then decreased,and weld width continued to increase.With the increase of arc length,penetration first increased and then decreased,and weld width gradually increased.When the tungsten electrode spacing increased from 3 mm,penetration gradually decreased,while weld width increased.However,with the increase of welding speed,both penetration and weld width decreased.The mixing of O_(2)had no significant effect on microstructure of the weld.Compared to the parent,impact toughness of the weld slightly decreased.This method could realize deep penetration welding at higher welding speed than the common TIG welding.

关 键 词：双TIG 活性电弧 焊接工艺 焊缝成形 

分 类 号：TG444[金属学及工艺—焊接]