耦合电弧钨极GPCA-TIG焊工艺

将耦合电弧钨极和GPCA焊方法结合,形成了耦合电弧钨极GPCA-TIG焊方法,该方法可实现深熔深高速度焊接.对比分析了在较高焊接速度时常规TIG焊、耦合电弧钨极TIG焊和耦合电弧钨极GPCA-TIG焊的焊缝表面成形和截面形貌,发现耦合电弧钨极GPCA-TIG焊可避免咬边和驼峰焊道的产生,并且焊缝熔深有所增加.耦合电弧钨极GPCA-TIG焊工艺试验表明,焊缝熔深和熔宽随焊接速度的减小和外喷嘴位置的升高而增大,随着弧长和外层氧气流量的增加先增加后略有减小;随着焊接速度的减小,弧长和外层氧气流量的增大,焊缝咬边减轻,外喷嘴相对高度变化时焊缝均未出现咬边.

Investigation on coupling arc electrode GPCA-TIG welding process

A new method named coupling arc electrode GPCA-TIG welding is proposed,which combines coupling arc electrode and GPCA welding method,and with which deep penetration and high-speed welding can be achieved. In this paper, the weld surface appearances and weld cross-section shapes with traditional TIG,coupling arc electrode TIG and coupling arc electrode GPCA-TIG welding are studied. It is found that in the coupling arc electrode GPCA-TIG welding,the weld undercut and humping bead can be avoided,and meanwhile the weld depth increase. The results of the coupling arc electrode GPCATIG process shows that the weld depth and width increase with the decreasing of weld speed and the rising of outer nozzle position; with the increasing of arc length and flow rate of the outer gas O₂,the weld depth and width firstly increase and then decrease. The weld undercut is weaken with the increasing of welding speed,arc length and flow rate of the outer gas O₂. A good weld surface appearance can always be obtained with any outer nozzle position.