problems with my 251??

[Jim]

Glad to hear you got it running right.

[question]

Its fixed !!!

tightened up the tension rolls to 2.5 and it is welding awesome now. Thanks for the tips. Glad this board is here

Agree with previous post, check the drive rollers & make sure you have them tensioned correctly. The wire to floor test to insure the feed is constant.
Keep us in the loop on your status.

[Jim]

Let us now what the problem was. I have a mm251 also. I guess you are using a new roll of .035 wire...? Double check the drive rolls to make sure they both are turned for .035 and make sure you have a .035 tip. I use about 2.5 on the wire tension knob for a 45lb roll. You might bump the volts up to 17.5 and see what the meter reads after the arc goes out. I always double check these things because I'll surely mess something up if I don't.

[Blackplague]

a simple little trick.

Remove the nozzle, with the contact tip {where the wire comes out} still on the gun, put the contact tip in a vice and tweek {bend ever so slightly} the contact tip. This will insure that the wire {due to the cast and twist of the wire} is always in constant contact with the contact tip so you don't loose the arc. Other than that, check the ground lead.

[question]

i have a new millermatic 251 and for the most part it has worked flawlessly. I was welding on some .134 mild steel tubing the other night and as i was welding, at times it seemed like it would lose it's arc and then start arcing again.. while the are was out i could still hear the gas coming from the nozzle.

my settings were 17.0 volts & 245 wire speed (1/8th inch tubing) also using 75/25 argon/co2 gas. Tank has plenty of gas and is regulator is set to 25.

power is being supplied through a 50amp breaker. I verified that the wire is feeding ok and gas doesn't seem to be a problem.

out of ideas... help?