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Operation: 1.Turn on the power switch. 2. Adjust the power knob. The general adjustment scale ( according to diameter of the part ) is 1 to 1.5 , ( fine ) adjustment scale is 7-8 (Can be adjusted according to scale of work requirements) 3. Hold the parts with tweezers and focus the end of the part to the tungsten needle (optimal distance is 5mm) ,the whole part can not touch the tungsten needle. 4. Stamp the foot switch. (then stepping away immediately). Welding is completed. Specifications:Voltage:110VPower:200W Maximum current:30A Weight:5KG/Set Package Includes:1 x DX-30A Welding Machine 1 x Foot Pedal 1 x Power Line 1 x Forceps Clamp 1 x Tungsten Needle 1 x Pedestal 1 x Handheld welding gunWorking Video Link:https://goo.gl/xQgXaP