以空气为舱内加压气体的钨极氩弧焊接

Gas tungsten arc welding using air as chamber gas

研究了1-700 kPa空气作用下的钨极氩弧焊接。气体爆炸试验表明,压缩空气虽然不爆炸但是显著助燃,高压焊接试验舱舱内设备需要采取防燃措施。采用较大的氩气流量,可以实现高压空气之下良好的电弧和熔池保护。自动焊机用于舱内焊接时,解决了线缆密封、摄像系统适应性等特殊问题,此外,以弧长代替电压作为控制变量消除了焊接电缆影响。16Mn钢平板焊接试验证明,虽然不同空气压力、不同位置实现单面焊自由双面成形的工艺参数明显不同,但是,采用脉冲焊接均可以获得性能优良的焊接接头。

This paper studied gas tungsten arc welding under 1-700 kPa air pressures.Explosion test indicated that hyperbaric air is not explosive but the flammability of objects within the chamber is greatly increased,so some explosion-proof measures have been taken in the hyperbaric welding test chamber.With much stronger Ar gas flow than the one in atmosphere welding,arc and weld pool were protected perfectly in hyperbaric air.To apply the automatic welding machine in the chamber,cables airproof and viewing systems adaptability have been solved specially,further more,voltage was replaced by arc length as a key control parameter to eliminate power cable effects.16Mn steel plate welding trials have shown that,although the operation parameters to realize one-side welding with back formation vary obviously in different air pressures and different positions,sound joints still can be obtained with pulsed current.