薄壁不锈钢管列置双TIG电弧高速焊接工艺

发布时间：2018-03-20 13:09

本文选题：高速焊接　切入点：双钨极惰性气体保护焊(Tungsten　出处：《机械工程学报》2015年12期 　论文类型：期刊论文

【摘要】：单钨极惰性气体保护焊(Tungsten inert gas,TIG)是目前工业用薄壁不锈钢管主要生产工艺,但其存在生产效率低的问题。针对高速TIG焊出现的驼峰焊道、咬边等焊缝表面成形缺陷产生的原因,提出列置双TIG电弧高效节能焊接新工艺。试验结果表明,采用双TIG电弧高效焊接新工艺,48 mm×1.2 mm和42 mm×1.5 mm两种规格的409L铁素体不锈钢管在获得良好焊缝成形的条件下焊接速度分别可达5.1 m/min和3.2 m/min;与单TIG焊接生产工艺相比,生产效率分别提高了240%和140%,能耗也分别降低44%和29%。两种规格铁素体不锈钢管膨胀率分别达到14.1%和33.7%,高于单TIG电弧焊的11.2%和21.4%,满足生产要求。分析表明,辅助TIG电弧加热主TIG电弧熔池后部堆积的液态金属,从热和力两方面延长熔池存在时间、促使液态金属回流填平主TIG电弧产生的熔池凹陷,从而有效抑制驼峰焊道和咬边的产生,在高速焊接条件下获得良好的焊缝成形,实现薄壁不锈钢管优质高效节能的焊接生产。
[Abstract]:Tungsten inert gas gas arc welding (Tungsten inert gas) is the main production process of industrial stainless steel tubes, but its production efficiency is low. The reason of forming defects of hump weld, edge cutting and other welds in high speed TIG welding is discussed. A new welding process with high efficiency and energy saving for column double TIG arc welding is proposed. The experimental results show that, The welding speed of 409L ferrite stainless steel pipe with 48mm 脳 1.2mm and 42mm 脳 1.5mm high efficiency welding process with double TIG arc can reach 5.1m/ min and 3.2m/ min under the condition of good weld forming, respectively, compared with single TIG welding process, the welding speed of 409L Ferritic stainless steel pipe is better than that of single TIG welding process. The production efficiency was increased by 240% and 140, and the energy consumption was reduced by 44% and 29.The expansion rate of ferrite stainless steel tubes of two specifications reached 14.1% and 33.7, respectively, which was higher than 11.2% and 21.4of single TIG arc welding, which met the requirements of production. The auxiliary TIG arc heats the liquid metal accumulated in the back of the main TIG arc pool, prolongs the existence time of the molten pool from both the thermal and the mechanical aspects, and causes the liquid metal to reflux and fill up the sag of the molten pool produced by the main TIG arc. Therefore, the production of hump welding pipe and edge cutting can be effectively restrained, and good weld forming can be obtained under the condition of high speed welding, and the high quality, high efficiency and energy saving welding production of thin-walled stainless steel tube can be realized.
【作者单位】：山东大学现代焊接技术研究所;山东朝日不锈钢有限公司;
【基金】：山东大学自主创新资助项目(2012TS034)
【分类号】：TG444.74

【参考文献】