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薄板TIG 焊时,利用脉动电流引起熔池振荡,当脉动电流与一定尺寸熔池自然振荡频率相同时,则熔池产生谐振,造成电弧长度及电弧电压有较大的往复变化。对电弧电压变动部分进行滤波,放大并用计算机采样,发现当熔池谐振时,电弧电压变动部分达到最大幅值,谐振后幅值很快衰减。本文以熔池谐振信号做为熔透信息进行熔透控制,给出了脉动电流电源,计算机检测系统。研究了熔透信号的变化规律及影响因素,在定点电弧及对接焊时,熔池尺寸与熔池谐振频率有较好的对应关系;以焊接电弧做为传感器,用熔池谐振频率控制熔透及熔池尺寸,有很好的重复性及较高的精度,这对解决熔透闭环自适应控制有很大的实际意义。
In the TIG welding, the molten pool is oscillated by the pulsating current. When the pulsating current is the same as the natural oscillation frequency of the molten pool with a certain size, the molten pool will resonate, resulting in larger reciprocal changes of arc length and arc voltage. The part of arc voltage was filtered, amplified and sampled by computer. It was found that when the meltdown tank resonated, the voltage of arc voltage reached the maximum amplitude and the amplitude attenuated quickly after the resonance. In this paper, melt pool resonance signal is used as penetration information for penetration control, pulsating current power supply and computer detection system are given. The variation law of the penetration signal and the influencing factors were studied. The size of the weld pool and the resonance frequency of the weld pool were well corresponded with the arc welding and the butt welding. The welding arc was used as the sensor, and the weld pool resonant frequency was used to control the penetration And the size of the weld pool, with good repeatability and high accuracy, which is of great practical significance to solve the problem of penetration and closed loop adaptive control.