开发了变极性TIG焊电源的微机控制系统，通过调节输出电流的正负半波时间、幅值获得不对称方波。
The controlling system of the variable polarity power source for TIG welding by microprocessor-80C552 is developed with flexible setting time and scope of the DCEP and DCEN.
脉冲电流幅值和EP半波时间对铝合金表面氧化膜的清理有重要影响，在焊接薄板铝合金时应采用较低的脉冲频率。
The pulsed current peak value and EP time have a important effect on removal of the surface oxide, the lower frequency should be adopted for thin sheet of aluminium alloy.
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