Profile: Jinan Huaao Electric Welding Machine Co., Ltd. specializes in producing high-power inverter welding machines. ZX7 series welders are general MMA arc welder which adopts the latest pulse width modulation (PWM) technology and the insulated gate bipolar transistor (IGBT) power module. It can change work frequency to medium frequency so as to replace the traditional hulking work frequency transformer with the cabinet medium frequency transformer. Thus, it is characterized with portable, small size, and low consumption. TIG welding machine adopts the advanced soft switching inverter based on the core fitting of IGBT and microcrystal magnetic cores with the 20KHZ inverter frequency. The product owns high load duty cycle with arc igniting current and current thrust control function. It owns the advantages of automatic compensation function for voltage fluctuation, stable arc, even weld crater, little splash and good weld formation. The way of arc striking is the HF arc striking. It adopts one kind of new electric HF arc igniter with strong HF discharge. The unique property improves the adaptability of welding machine, and even connecting long cable, it can keep good arcing performance. Its top inverting frequency of 20KHZ reduces the current fluctuation influence for arc much, which makes arcing and arc static current very low (20A).