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在电站锅炉安装中,膜式水冷壁管、省煤器和高温段过热器等的管子间距都很窄,不利于操作,给打底焊带来很大困难。采用氩弧焊打底工艺取代气焊和手工电弧焊,取得了较好的效果。氩弧焊打底工艺这种工艺对坡口钝边要求较严,具体尺寸因大小管各异。对口问隙一般为3毫米,要求大于焊丝直径,不能因间隙的收缩使焊接无法进行。引弧时,要在坡口面上慢慢擦燃,不允许用大动作,以免气体发生紊流破坏保护,或破坏钨极,造成焊缝夹钨。焊丝由坡口处送
In the power plant boiler installation, membrane tube wall water heater, economizer and high temperature superheater pipe spacing is very narrow, is not conducive to operation, to bring the backing welding is very difficult. TIG welding process instead of gas welding and manual arc welding, and achieved good results. TIG welding primer process This process on the blunt edge of the more stringent requirements, the specific size due to the size of different tubes. The gap between the mouth is generally 3 mm, the requirement is greater than the wire diameter, the gap can not shrink so that welding can not be carried out. When starting the arc, it is necessary to burn the fuel slowly on the bevel surface, disallow the big action to prevent the gas from damaging and destroying the protection or destroying the tungsten electrode, resulting in the tungsten-containing weld. Wire sent by the bevel