【摘要】 比较分析了DCEPPMIG焊与DCENMIG焊的焊接现象 ,在此基础上 ,解释了研究开发ACPMIG焊的意义。ACPMIG焊克服了DCEPMIG焊时容易产生的磁偏吹现象 ,且比DCEPPMIG焊的焊丝熔化速度快、焊缝熔深浅。ACPMIG焊有多种电流模式 ,其交流电流负极性比率ACIEN %主要用于控制焊缝熔深 ,其交流电流正极性脉冲IP主要用于控制熔滴过渡 ,最理想的是 1周 1脉 1滴的熔滴过渡形式。根据有关的研究表明 ,在相同送丝速度的条件下 ,ACPMIG焊的焊缝熔深随ACIEN %增加而减小 ,焊缝表面光泽好 ,焊丝熔化金属热含量低等 ,这些特点最适宜用于焊接薄板更多还原

【Abstract】 On the basis of comparing and analyzing welding phenomenon of the DCEP P MIG welding and DCEN MIG welding, this paper explains the significance of researching and developing AC P MIG welding.The magnetic blow which is easy to generate in DCEP MIG welding is controlled in AC P MIG welding.Compared with DCEP P MIG welding,the welding wire melting rate is faster and the weld penetration isshallower.AC P MIG welding has varieties of current mode,the AC negative polarity rate AC I EN% is mainly used to control weld penetration , the AC positive polarity pulse I p is mainly used to control metal transfer. The most ideal form of metal transfer is a pulse with a droplet.The related research indicates that the weld penetration of AC P MIG welding is decreasing just as the AC I EN% is increasing in the situation same of wire feed rate.The characteristic of lustrous welding seam surface and low heat content of melting metal are available to weld thin sheet.更多还原