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Hi Dieselrider, Hard to beat Bills comments. From your last two comments Bill, I see school has paid off very well for you :) Frying bacon is that perfect sound were looking for on a Mig. Dials are for remembering where too set a "pictular" machine as a refferance mark. What setting works on one machine may not work on all machines. On a simple Mig machine with two dials, voltage adjustment and a wire speed adjustment, you want to set the voltage first. Depending on plate thickness 18v to 26v for 16ga to 1/4" material for a single pass weld. Next set the wire speed. The best way I found is to use a piece of scrap metal. Place the torch cup on edge of the cup lip on the base metal at a angle that will give a approx. wire arc length while your welding. Set the wire speed in the middle of the range adjustment to start with. If you have 0 to 10 adjustment dial then start on 5. Start a arc then adjust the wire speed until it's very smooth or sounds like bacon frying. This has to be done fairly quickly as the moulten puddle will build up thus changing arc length. If the molten puddle becomes too high, restart another arc in a clean area. This will be the correct wire speed for a given voltage at a given arc length. Change the arc length too much from the orginal adjustment, then you will need to readjust wire speed or voltage to compensate for the different arc length. Arc length is very important to control no matter what welding process your using. That is one reason why a machine weld is so uniform vs a free hand weld. NEVER adjust volatage or amperage while the machine is under a load or anotherwords while welding. This will burn the adjustment control or arc the reostat fins closed to where amperage can no longer be controlled. T_Bone
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