低能量焊接工艺控制参数对熔滴尺寸的影响

Effect of control parameters of LET welding process on the droplet size

低能量过渡焊接技术(Low Energy Transfer Welding Technology,简称LET)是一种新型焊接方法,它采用推拉送丝的方式完成熔滴过渡,焊接过程无飞溅,并能有效降低焊接热输入。LET焊接系统通过电流输出和焊丝运动相互匹配,两者协同工作实现稳定焊接。由于熔滴尺寸直接影响熔敷速度,通过焊接工艺试验,深入研究燃弧峰值电流I_(ap)、保持时间T_(ap)、送丝速度v_(z2)、焊丝送进延时时间T_1、焊丝回抽速度v_(f1)及焊丝回抽延时时间T_3等控制参数对熔滴尺寸的影响规律。结果表明:随着I_(ap)、T_(ap)、v_(f1)、T_1和T_3的增大,熔滴尺寸增大,而v_(z2)对熔滴尺寸的影响不明显,适当调节焊接工艺参数能够有效控制熔滴尺寸。本研究为深入了解LET焊接工艺过程,有效调节焊接熔敷速度奠定了良好的实验基础。

Low energy transfer welding technology is a new method of welding,It completes droplet transition by push-pull wire feeding, there is no splash during the welding process, and it can reduce the heat input effectively.The current output and the wire movement match each in order to achieve a stable welding process. Due to the size of the drop size affect the welding deposition rate directly,so this article studied the influence of the peak arc current Iap,retention time Tap,wire feeding speed Vz2,the delay time of welding wire feeding T1,wire withdrawing speed Vf1 and the delay time of withdrawing welding wire T3 by LET welding system. The Results prove that with the Iap,Tap,Vf1,T1 and T3 increasing the droplet diameter increases,with the increasing of Vz2,the droplet diameters have a little change, so It is possible to adjust the welding parameters appropriately to control the size of the droplet size. This work laid a good experimental basis for understanding of LET welding process and the regulation of weld deposition rate.