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本文对铝MiG焊接电弧固有自身调节作用及其物理本质,形成机理及影响因素进行了研究。用自制的电弧演示装置及平特性(CV)电源和垂直下降特性(CC)电源及垂直陡降带短路补偿的等电弧电流(CAC)电源,测出了不同送丝速度下不同弧长的熔化特性曲线,并对曲线的各部走向进行了分析,得出最强的电弧固有自身调节作用是在上部短路过渡区。这是由于过渡型式的变化和接触型过渡熔滴尺寸(即短路频率)的变化引起的。
In this paper, the inherent self-regulation of aluminum MiG welding arc and its physical nature, formation mechanism and influencing factors were studied. The arc current (CAC) power supply with self-made arc demo device and CV (CV) power supply and vertical drop characteristic (CC) power supply and vertical steep drop with short circuit compensation were used to measure the melting of different arc lengths at different wire feed speeds Characteristic curve, and analyzes the trend of each part of the curve, it is concluded that the strongest self-regulation function of the arc is in the upper short-circuit transition zone. This is due to the change of the transition type and the change of contact droplet size (ie short-circuit frequency).