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推广CO_2气体保护焊是目前造船厂实施高效焊接的重点。利用CO_2气体保护单面焊工艺,配用陶质衬垫,可以达到正面焊接,反面同时成形的目的。同时也能用平对接、横对接代替船舶建造中不能翻身的分段和船台分段合拢中的仰焊,这样既减轻焊工的劳动强度,提高焊接效率,又缩短了造船周期,取得了十分显著的经济效益,现已得到广泛的应用。但是,在推广CO_2气体保护半自动单面焊工艺中,打底层焊缝出现沿焊缝柱状晶结晶方向的柱状气孔,严
The promotion of CO 2 gas shielded welding is the focus of the shipyard to implement efficient welding. The use of CO_2 gas protection single-sided welding process, with ceramic liner, can achieve the front of the welding, while the reverse forming the purpose. At the same time, it can also be used for flat butt-jointing and transverse butt-jointing instead of overturning in the ship-building in which the ship can not be turned up and in stages and collapsed, so that the workmanship of the welder is reduced, the welding efficiency is improved and the shipbuilding cycle is shortened. The economic benefits, has now been widely used. However, in the promotion of CO_2 gas protection semi-automatic single-sided welding process, the bottom seam weld appears along the columnar columnar crystal grain direction of the columnar pores, strict