304L奥氏体薄壁不锈钢管列置双TIG高效焊接工艺

单TIG(Tungsten inert gas)焊是目前薄壁不锈钢管的主要生产工艺,但其存在生产效率较低的问题。在304L薄壁不锈钢管的焊接生产过程中,提高焊接速度易出现咬边及驼峰焊道等焊缝表面成形缺陷。将列置双TIG高效节能焊接新工艺应用于304L薄壁不锈钢管的焊接生产。试验结果表明,Ф 20 mm ×1.0 mm以及Ф25.4 mm ×1.0 mm两种规格的304L薄壁不锈钢管采用列置双TIG焊接工艺可以获得表面成形良好的焊缝,焊接速度均可达到3.0 m/min,相比单TIG焊,焊接速度均提高约66.7%,焊接能耗分别降低约17.5%和23.3%。钢管水胀成形结果表明,两种规格的不锈钢管膨胀率分别可以达到33.9%和41.0%,同时表面无裂纹产生,均符合304L不锈钢管的生产要求。

High efficiency tandem TIG welding of 304L austenite thin-walled stainless steel pipe

Single TIG welding is the key manufacturing technology of thin-walled stainless steel pipe for industrial application, but its production efficiency is lower. During the high speed welding production of thin-walled stainless steel pipe, undercut and humping weld appear easily. In this paper, the tandem TIG welding was applied to the production of 304L thin-walled stainless steel pipe, and the welding process was developed through experiments. The experimental results indicate that the welding speed of 304L austenite stainless steel pipe with two specifications of Ф20 mm×1.0 mm and Ф25.4 mm×1.0 mm can both reach up to 3.0 m/min under the condition of good weld appearance. Compared with single TIG welding production, tandem TIG welding can improve the production efficiency by about 66.7%, reduces energy consumption by about 17.5% and 23.3%, respectively. The expansion ratios of the 304L austenite stainless steel pipe with these two specifications reach 33.9% and 41.0%, which satisfy the requirement of production.