粉末熔池耦合活性TIG焊接方法

发布时间：2018-04-01 22:25

本文选题：SiO　切入点：粉末熔池耦合活性TIG焊　出处：《材料导报》2017年22期

【摘要】：提出了一种新型活性焊接方法——粉末熔池耦合活性TIG焊(Powder pool coupled activating TIG welding,PPCATIG)。该方法采用双层气体进行焊接,内层利用惰性气体保护钨极,外层通过自动送粉装置将活性剂粉末随保护气体送入电弧-熔池区域,增加熔深,提高焊接效率,实现机械化自动化焊接。针对SUS304不锈钢进行了直流正接PPCA-TIG表面熔深,通过与传统TIG焊对比,研究了SiO_2活性剂对电弧形态、焊缝成形、组织和力学性能的影响。结果表明:SiO_2能使电弧等离子体收缩、熔池金属流态改变,并且焊缝熔深能达到传统TIG焊的3倍以上,焊接效率明显提高。焊缝组织主要为奥氏体和铁素体,铁素体形态以骨架状为主。焊缝抗拉强度略低于母材,但相比传统TIG焊,焊缝屈服强度略有提高,其焊缝低温冲击韧性达到了传统TIG焊的96.8%,表现出了良好的力学性能。同时,采用该方法可有效避免活性剂粉末对钨极的污染。
[Abstract]:A new active welding method, powder pool coupled activating TIG welding, is proposed.In this method, double layer gas is used for welding, the inner layer uses inert gas to protect tungsten electrode, and the outer layer sends the active agent powder along with the protective gas into the arc molten pool area through the automatic powder feeding device, which increases the penetration depth and improves the welding efficiency.Realize mechanized automatic welding.The surface penetration of SUS304 stainless steel was studied by direct direct direct connection PPCA-TIG. The effect of SiO_2 active agent on arc shape, weld formation, microstructure and mechanical properties was studied by comparing with traditional TIG welding.The results show that the arc plasma shrinks and the flow state of molten pool metal changes. The weld penetration is more than three times that of conventional TIG welding, and the welding efficiency is improved obviously.The microstructure of weld is mainly austenite and ferrite, and the shape of ferrite is skeleton.The tensile strength of the weld is slightly lower than that of the base metal, but the yield strength of the weld is slightly higher than that of the conventional TIG welding, and the low temperature impact toughness of the weld is up to 96.8 of the conventional TIG welding, showing good mechanical properties.At the same time, this method can effectively avoid the pollution of tungsten electrode caused by active agent powder.
【作者单位】：兰州理工大学材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室;
【分类号】：TG444.74

【相似文献】