一种基于亚射流的PMIG焊电弧电压控制方法  

Method of pulsed-MIG welding arc voltage control based on sub-spraying transfer

作　　者：林放[1] 魏仲华[2] 陈小峰[2] 崔龙彬[2] 薛家祥[2] 

机构地区：[1]江门职业技术学院机电技术系,江门529000 [2]华南理工大学机械与汽车工程学院,广州510640

出　　处：《焊接学报》2012年第7期17-20,114,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50875088);广东省科技计划资助项目(201B010700001);番禺区科技攻关资助项目(2010-Z-22-1);黄埔区科技攻关资助项目(1021)

摘　　要：针对熔化极脉冲氩弧焊(PMIG焊)主要采用恒流控制和等速送丝的焊接方式,提出了一种基于亚射流的PMIG焊电弧电压控制方法;其控制原理是对每个脉冲周期的平均电弧电压进行检测,当平均电弧电压在亚射流区域内,则完全依靠其在亚射流区域内固有的自身调节能力进行调节,当平均电弧电压超出亚射流区域后,在其它焊接参数不变的条件下,通过改变基值时间来改变脉冲周期内的平均电流值,从而改变焊丝熔化速度,提高电弧调节能力和抗扰动能力.结果表明,采用该控制方法可以显著改善焊接电弧的动态响应特性,有效抑制电弧电压的扰动,焊缝成形均匀一致.Constant current control and constant wire feed were both used in the pulsed metal argon arc welding power source.The method of pulsed-MIG welding arc voltage control based on sub-spraying transfer was put forward.Its principle is as follows:the average arc voltage of each period of pulse was measured.If the average arc voltage was within the sub-spraying transfer range,the arc length would be adjusted only by self-adjusting of the arc.But if the average arc voltage went beyond the sub-spraying transfer range,the background current time changed so that the average current in each pulse period changed,so did the burn-off rate in the welding conditions above.It was found that the arc adjustment and anti-disturbance ability were improved.The results of the tests indicated this method obviously improved the welding dynamic characteristics and efficiently restrained disturbances.In addition,well-formed welding seams were acquired.

关 键 词：熔化极脉冲氩弧焊 亚射流 电弧电压控制 

分 类 号：TG434.4[金属学及工艺—焊接]