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利用自主研发的受控脉冲穿孔等离子弧焊接系统及其控制模式,进行了等厚度板和变厚度板的受控脉冲穿孔等离子弧焊接工艺实验.本文中定义小孔的热滞后时间(t_L)为尾焰电压信号达到其峰值70%时所需时间(t_(VE0.7))与焊接电流达到峰值所需时间(t_(IP))之差,并测定了不同工艺条件下小孔的热滞后时间.实验结果表明,等厚度不锈钢板焊接实验条件下,小孔的热滞后平均时间是0.36 s;变厚度不锈钢板焊接实验条件下,随着试件厚度逐渐变薄,焊接电流峰值不断降低,但各个周期内小孔的热滞后时间的波动幅度不大,其平均值为0.22 s.
The controlled pulse perforation plasma arc welding process of constant thickness plate and variable thickness plate was carried out by controlled pulse perforated plasma arc welding system developed independently and its control mode.The thermal lag time (t_L) of the small hole was defined as The difference between the time (t_ (VE0.7)) and the peak time (t_ (IP)) required for the tail flame voltage signal to reach its peak value of 70% and the thermal hysteresis of the orifice under different process conditions Time.The experimental results show that the average time of thermal hysteresis is 0.36 s under the condition of equal thickness stainless steel welding experiment.With the thickness of the specimen being thinner and the welding current peak continuously decreasing under the condition of variable thickness stainless steel welding, However, the thermal lag time of the holes in each cycle fluctuated slightly, with an average value of 0.22 s.