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Re: Welder not welding
The contact tip is the main source of power, if the tip is bigger than the wire then you will not get a proper conection, the earth clamp is a essential part of the system make sure you have a good earth and all the conections are tight
SOunds like your ground is not connected solidly either inside the machine or at the ground clamp. Check to make sure the ground wire at the clamp is not broken then make sure the ground wire is connected solidly inside the machine.
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first unscrew the tiny tip at very end of torch (can be hot)!! then try to feed wire thru handle,gently shake cable as you do helps to feed wire thru cable , if successful you have allowed the amps to get too high for the feed rate (slow) and melted the tip closed , these tips are replaceable from miller and are not expensive
1/4" plate with a 135 amp machine is probably beyond it's duty cycle abilites. If you are using a mixed gas, and pushing the max on the settings, it will be cutting out because it is designed to.
You might want to get a higher amperage welder for consistent welding of 1/4"
The 140 Pro maxes out at 5/16" using inner shield wire. and 1/8", or 10 guage with gas.
Try to short the trigger wire back closer to the unit or better still inside the panel somewhere. There is often a relay that is operated that allows gas to flow and power to the wire feed motor. Check where the trigger wire goes it may give you some idea. If you can identify the part you can source one and see if it worthwile repairing. Cheers
Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .
i had the same problem. its probably a bad solder on the wire feed pot. not hard to fix ,but you need a solering iron .BE CAREFULL 1 unplug welder.
2 remove pot and the nut underneath.
3 remove case from welder and remove controll box.
4 run the soldering iron over the joins , then put it all back together, should work fine.
You may have the scew settint your wire tension set to tight. Try loosening the tension and if that doesnt work check the eletrical wire that supplies the power to the roller and make sure it hasnt become disconected.