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前言熔化极气体保护焊有三种熔滴过渡形式:喷射过渡(细粒过渡)、粗粒过渡及短路过渡。后两者由于存在一定的飞溅,不宜长时间连续工作。短路过渡焊最适于薄板的焊接。目前,在自动焊接厚板方面,对混合气体保护焊及大电流粗焊丝CO_2气保护焊,有着较多的研究和报导。混合气体焊,虽在焊缝成形及降低飞溅等方面均较满意,但混合气体中须用多量氩气(通常在70～75%),
Preface There are three types of droplet transitions in MIG welding: jet transition (fine grain transition), coarse grain transition and short circuit transition. The latter two due to the existence of a certain splash, not long hours of continuous work. Short circuit transition welding is most suitable for sheet metal welding. At present, there are more researches and reports on the automatic welding thick plate for the welding of mixed gas and large current thick wire CO_2 gas welding. Mixed gas welding, although the weld formation and lower spatter are satisfied, but the mixed gas to be used in a large amount of argon (usually 70 to 75%),