向下向上焊联合焊接厚壁大直径管道

Vertical down and up joint welding for thick-walled large-diameter pipeline

向下焊和向上焊各有独特的焊接优点,以材质X52,规格φ526 mm×10 mm的大直径管为例,根据与热焊采用向下焊,填充盖面采用向上焊。详细讲述了该管根焊、热焊、填充焊、盖面焊时的焊条角度、运条方式、熄弧位置、接头处理等方法,以及操作中的具体注意事项。采用两种联合焊的方法,获得了良好的焊接质量,焊接速度提高了20%,焊材成本降低了30%。

Vertical down and up welding has each advantages,this paper takes the material X52 large-diameter pipeline,whose specification is Ф526mm×10mm as an example,using vertical down welding for root and heat welding,and vertical up welding for filling surface.It also relates the operation attentions and conditions in root,heat,fill and surface covered welding,such as angle and transportation methods of electrode,position of extinguishing arc and joint processing approach,etc.Jointly using two welding methods can get good welding quality,increase the welding rate by 20% and reduce the cost of material by 30%.