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高速发展的四化建设,对产品焊接质量的要求越来越高。目前氩弧焊已为国内外大量采用,本文将对直流钨极氩弧封底焊工艺作一介绍。一、手工直流钨极氩弧封底焊最容易出现的缺陷1.焊缝根部的内凹、透瘤、未熔合及未焊透;2.引弧方法不当导致的焊缝夹钨;3.送丝方法不当导致的焊缝根部有未熔焊丝和内凹;4.收弧处的弧坑缩孔;5.焊接不锈钢、合金钢时,焊缝根部氧化。二、避免产生缺陷的方法1.对口要求:坡口处不得有油、锈等杂质,否则必须处理干净;坡口预留1～1.5mm 钝边;焊缝对口间隙为所用焊丝直径的1.2倍。若间隙过小,再由于焊接时受热间隙收缩,
The rapid development of the four modernizations, the product of the welding quality requirements are getting higher and higher. At present, argon arc welding has been widely used at home and abroad, this article will make a brief introduction of the DC TIG welding process. First, the manual DC TIG welding the most prone to defects 1 weld root concave, tumorous, unfused and incomplete penetration; 2 arc improper lead welding tungsten; 3 4, arc crater shrinkage hole at the arc; 5, when welding stainless steel, alloy steel, the root of the weld is oxidized. Second, to avoid defects in the method 1 counterparts requirements: no groove at the mouth of oil, rust and other impurities, or must be treated clean; bevel reserved 1 ~ 1.5mm blunt edge; weld gap is used for the wire diameter of 1.2 times . If the gap is too small, then shrinkage due to welding heat gap,