脉冲TOPTIG焊熔滴过渡特性分析

TOPTIG焊是一种新型的机器人TIG填丝焊接工艺，具有不同于普通TIG填丝焊的熔滴过渡特性，文中通过搭建TOPTIG焊接试验平台，利用高速摄像和电信号采集系统,对在不同条件下的焊接过程进行高速摄像和电信号的同步采集，从而对TOPTIG焊的熔滴过渡特性进行了研究.结果表明，熔滴与熔池相接触时，由于电磁力的作用使得电弧发生偏转.熔滴过渡只能通过接触熔池的方式来实现，在过渡过程中，熔滴的重力和其与熔池之间的表面张力是促进过渡的主要作用力.电弧峰值电流和送丝速度存在一个合理的匹配区间，并且随着峰值电流的增大，匹配区间缩窄.

Study on characteristics of droplet transfer for pulsed TOPTIG

TOPTIG is a new welding technology of tungsten inert gas (TIG) with feeding wire robotic welding process. It is different from conventional TIG with filling wire in the characteristics of droplet transfer. The welding platform of TOPTIG is built to collect the high-speed photography and electric signals at the same time in the welding process under different conditions using high-speed camera and an electrical signal collecting system to study the characteristics of droplet transfer. It is found that when the droplet is in contact with the molten pool, which will cause the deflection of arc. The droplet transfer can only be realized by means of the contact with molten pool, where the gravity of droplet and the surface tension between the droplet and the molten pool are the major force to promote the transfer. A reasonable matching range exists between the peak current and the wire feeding speed, which will be narrowed with the increase of the peak current.