Welder Repair Adjusting the High Frequency Contacts. Does the ARC on your TIG Welder sometimes not start or maybe when you press the trigger all you hear is a buzzing sound from inside the welder. It could be a very simple and easy fix! Today I'm going to show you how I inspect, clean and adjust the high frequency contacts inside a high frequency TIG Welder and get it running new again.
This video is for entertainment purposes only. There are capacitors inside the case that store energy when the unit is unplugged. You can be electrocuted and die even if the unit is unplugged. Do not open the case. Take it to a professional.
Always read and follow the manufacturer’s safety guidelines before handling tools. Seek professional advice and training before using any welding equipment. Never operate any tool without wearing the proper personal protective equipment. Final warning, Do not attempt to do any of the things you see me doing!
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Disclaimer: These videos are intended for entertainment purposes only and as such, you should not attempt to do any of the things you see me doing. Always read and follow the manufacturer’s safety guidelines before handling tools. Seek professional advice and training before using any welding equipment. Never operate any tool without wearing the proper personal protective equipment. Final warning, Do not attempt to do any of the things you see me doing!
Two questions: why is there a gap and (most importantly) There Are Energized Components In There??? I thought I was safe when changing wire rolls on a mig machine, with the unit unplugged .
Or is this just a TIG thing?
+Gordon Reiher Anytime buddy! I wanted to be an electrician ever since I was a little kid so right after High School I went to school for it and had to take a lot of electrical theory and electronics classes. I worked as an electrician for several years but soon realized it was not what I wanted to do. If I can help someone, it makes me feel like my education didn't completely go to waste LOL. Cheers brother
Gordon, You will find capacitors in a lot of welders (and plasma cutters) that are NOT transformer based machines. Think of a capacitor as a high pressure tank. It stores normal current at very high voltages until it is needed. An example is a start capacitor in a motor. When the switch to the motor is turned on, the capacitor dumps it's energy giving the motor the extra grunt needed to start. My mig welder is transformer based so it relies on the transformer winding rather than a capacitor. The selector switch or "taps" at the transformer are how it varies the output. This is only a theory, but I believe the high frequency contacts are to limit / protect the current to the capacitors. I haven't experimented with them but I bet closing the gap would make for a very crisp start, but would probably load the capacitor higher than it's rated voltage (shortening it's life), while increasing it would lover the voltage at the capacitors making the arc less crisp or possibly even having to make contact with the tungsten. Your mig machine should not have any exposed line voltage lugs in the cabinet where the user would change reels. You may have exposed DC terminals however that should not be energized when the machine is off. If your mig welder is very heavy, it's probably transformer based, if it's light, it's probably an inverter machine with capacitors. To my knowledge, the gap setting contacts are exclusive to high frequency tig and high frequency plasma cutters. I believe some of the more modern and more expensive machines use relays and resistors in place of the contacts.
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