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为焊接铝、镁及其合金0.3～1毫米的薄壁结构,必须使焊接电流降到10～30安培。这在一般的不熔化极交流氩弧焊时,电弧难以稳定。目前较常用的 NSA—300型焊机,当焊接电流降到50安培以下时,电弧即不稳定。当采用无反馈饱和电抗器,获得梯形波交流电流,并加入稳弧脉冲时,能得到满意的效果。我室制造 NSA—120型焊机,在10～120安培范围内,电弧能稳定燃烧。本文着重分析:饱和电抗器产生梯形波的原理、影响梯形波的因素、不同铁芯材料的影响以及设计时注意之点;脉冲稳弧器的作用,脉冲的相位关系及主要参数的确定。
For the welding of aluminum, magnesium and its alloys 0.3 ~ 1 mm thin-walled structure, the welding current must be reduced to 10 to 30 amperes. This is not common in the melting arc AC welding, the arc is difficult to stabilize. Currently more commonly used NSA-300 welder, when the welding current dropped below 50 amps, the arc is unstable. When using non-feedback saturable reactor to obtain trapezoidal wave AC current, and adding a stable arc pulse, can get satisfactory results. NSA-120 welder is made in our room, and the arc can stably burn in the range of 10 ~ 120 amperes. This paper focuses on the analysis of the principle of the trapezoidal wave generated by the saturable reactor, the factors affecting the trapezoidal wave, the influence of different core materials and points of attention in the design; the function of the pulse arcing device, the phase relationship of the pulse and the determination of the main parameters.