【摘要】 利用自行研制的双电弧软开关脉冲GMAW装备,从弧长控制、熔滴过渡以及焊缝成形等角度对双电弧脉冲GMAW三种复合外特性进行了试验研究。结果表明,主机I-I,从机I-I复合外特性的熔滴过渡均匀,可控性好,但电弧自调节作用较差,适合薄板高速焊接;主机U-I,从机U-I复合外特性的熔滴过渡可控性欠佳,但电弧自调节作用较强,较适合大参数厚板焊接;主机I-I,从机U-I复合外特性中主机的熔滴过渡可控性好,电弧自调节能力有限,从机的电弧自调节作用较强,但熔滴过渡可控性欠佳。更多还原

【Abstract】 The twin arc pulsed GMAW(gas metam arc welding) process possesses the advantages of high efficiency and automation,and is a process with great application foreground.The matching ways between the external characteristics of the pulse output stage and that of the pilot arc stage can take great influences on the welding arc stability,metal transfer and the appearance of weld,etc.A novel twin arc soft-switching pulsed GMAW system was developed and used to explore the three kinds of typical hybrid external characteristics in depth from the aspects of arc length control,metal transfer and appearance of weld.The experimental results indicate that the master power I-I,slave power I-I hybrid external characteristic is with good controllability of the metal transfer and suitable for the high speed welding of the thin plate,except for the poor adaptability of the welding arc length;the master U-I,slave U-I hybrid external characteristic is with good adaptability of the welding arc length control and is suitable for the welding of the slab work piece,except for the poor controllability of the metal transfer;in the master I-I,slave U-I hybrid external characteristic,the master arc is with good controllability of the metal transfer and limited self-adaptability of the arc length,and the slave one is with good self-adaptability of the arc length and poor controllability of the metal transition.更多还原