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Re: millermatic 200 won't weld
First check on the plate that tells imfo of unit ,there is what is called duty cycle.If the duty cycle says per say 30%,that means you can weld full power for 3 minuets before unit will shut down to cool.if it says 100% duty cycle there is no limit on weld time.this is the first thing to understand,if that is not the case check the main contactor where the power imput wires go,pull the gun trigger see if the contactor is pulling in , it should if not no welding amperage.
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Presumably the wire feed motor is running and driving the wire feed roller?
If this is correct there are a few things to check - when welding it isn't unusual for the wire to become welded to the tip. When this happens a powerful wire feed tends to keep feeding until the wire becomes impossibly tangled and knotted. Low powered wire feed units usually just begin to slip on the wire especially when 0.8 mm or larger wire is being used.
Try removing the welding tip and check if clean new wire will feed smoothly; ensure the correct roller groove is being used for the size of wire.
A welder that is used infrequently often becomes troublesome for a while. Micro-rust forms on the outer layers of wire and some of it is removed as it travels through the torch liner, sometime the liner becomes damaged and should be replaced.
Removing the tip and wire and blowing trough both ends with compressed air should remove any accumulation of dirt and dust. Cut off and discard the outer layers of wire if they have become dull. I spray a little WD-40 on the wire to keep rust at bay and help the wire feed through the liner. Ensure the wire end is neat and straight and with the torch laid straight along the floor allow fresh, clean wire to feed through the liner.
Once a few inches of wire is protruding fit a new tip of the correct size, fit the gas shroud and you are good to go.
If the burn-back rate is adjustable on your machine it should be turned to minimum.
Various things can cause the wire to weld to the tip apart from the burn-back rate - dirty or corroded substrate, holding the welding torch too close to the work, incorrect adjustment of the power/current and wire speed and welding continuously so the tip becomes overheated and if gas is being used, a gas pressure/volume that is too low or perhaps attempting to weld in a draught...
Welding with CO2 gas produces a coarser operation with more spatter and suit some machines more than others. Some machines perform better and more consistently with Argoshield, a mix of CO2 and either 5% or 10% Argon. The added expense might be worth paying.
I think your problem has something to do with your on/off switch. Remove the cover that houses this switch and take a look. You may need to change the switch or possibly just hook up a wire that happened to fall off the switch. Good Luck Friend.
You bought this brand ne from a merchant?
Take it back.
The over heat light is when you have welded too long and it shuts down to cool off; were you welding?No wire feed is too vauge; you looked at feed motor and the wheels aren't moving?
Been welding for a while, open side, check for proper tension on the feed wheel inside side panel, hit the trigger, if feed motor continues to spin tensioner needs tightened or mig wire may be getting hung up inside main cable lead. If motor is off on off on then its probbably the switch on the trigger getting a bad good connection, hope this helps o and check welding tip on gun end, may need replaced if worn or melted, unscrews.
I have welded countless hours with Linde & Lincoln & even a few Hobarts & the only time that I ever had the same problem was when the ground connection either to the object I was welding, or the welding cable ground wasn't good & clean & tight. Same on stick welders also. I did develop the habit of grinding not only where I was preparing to weld, but where I was placing my ground clamp & that always provided a better "frying bacon" sound as I went along the business of pushing a bead. In a welder, the only other thing than that is involved is the step-up transformer and your wire. Hope this helps.
What is it doing? stabbing the wire into the work? The voltage is too low for the speed of the wire feed.. Turn up your voltage and slow down the wire. then increase your wire according to the speed of travel of weld. That is an awesome machine but it is still up to you to get the settings dialed in. Good Luck, Ned.