【摘要】 为使铜铝管焊接质量稳定,即焊接电流稳定,分析了铜铝管焊接过程,设计了可进行电压补偿的PLC控制系统。在每次焊接前,通过测量电源电压,经控制系统分析和计算,可以得到与电源电压对应的晶闸管导通角,并将其传给触发板,从而保证焊接电流不受电源电压波动影响。导通角的计算采用了试验与数学插值相结合的方法,对特定的试验数据应用三次样条插值法得到了导通角与电源电压的关系式。用铜铝管8 mm×1 mm进行焊接试验并对电流数据进行T检验。结果表明,电源电压在380 V±15%波动范围内,焊接电流较稳定,可保证铜铝管焊接质量。更多还原

【Abstract】 According to the welding process of copper pipe and aluminum pipe,a PLC control system with the function of voltage compensation was developed to stabilizing the welding electric current and welding quality.Before welding,power voltage was measured,and the angle of flow for silicon control can be calculated by control system,and then transmitted to the trigger circuit board.And the cubic spline was used to fit the relationship of the angle of flow and power voltage.When the voltage waved in the rang of 380 V±15%,8×1 copper pipe and aluminum pipe were jointed and the experimental datum of welding electric current was obtained.The result of the T-test to electric current datum shows that the welding current is stable.The welding quality is reliable.更多还原