welder pulsing?

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Old 06-11-07, 09:36 PM
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Red face welder pulsing?

Here lately my welder seems to want to pulse all the time. Its a Powerarc 125 turbo. I don't know anything about the workings of a welder even though I have been welding on and off for most of my life. Never had a problem like this until now. I've had it for a couple years and only use it on occasion. I think I might have gone through maybe five lbs. of wire with it. Anyone here know what may be causing this? I have tried every setting in every direction imaginable and it does'nt seem to make much difference. Although it does seem to weld better on thicker material, I think. Its been a while sense I welded anything but thinwall tubing as in exhaust. Kind of stumped on this. any help would be appreciated. thanks.
 
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Old 06-11-07, 10:05 PM
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when you say "pulsing", what seems to be pulsing.

with a wire fed welder, the wire can bind in the liner of the feed cable from dirt and/or deterioration and give you a jerky wire feed.

I have also had the wire weld to the tip adn then snap free and have it repeat which would give a pulsing or jerky feed as well.
to fix the liner, you would intall a new one. To remedy the tip situation, I would install a new tip and be sure to use tip dip or some other brand of tip lube.

also, the feed rollers, if maladjusted can slip when feeding the wire as well as if they are worn out will cause jerky feeds.

I have has wire that has rusted or had other contaminants that also cause it to bind in the liner.

many of these items will show up more on a slower feed speed more so than a fast feed.
 
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Old 06-12-07, 11:00 PM
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if you pull the trigger and just feed the wire it comes out fine, but when u strike your ark its like weld stop weld stop in fast succession. u can't get a solid bead. I have checked the feed rollers and pretty much everything else but as far as the internal workings I haven't a clue as what to look for or check. I guess its what I get for buying a off brand, but I'm sure its made by one of the better brand names and just put someone elses name on it. I am going to have to see if I can find out who that is and see if I can't have some kind of contact with the makers.
 
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Old 06-13-07, 03:04 PM
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that sounds like you have the machine cranked up too hot. in that case what would be happening is as the wire touches the base metal, since it is so hot, it burns the wire back to the tip. So, since it loses contact with the base metal, it quits welding until the wire is long enough to reach the base metal again, initiating an arc, then it burns of and on and on.

try various temps from one end of the range to the other to see if you get any change

dirty or corroded wire will do this too since the wire has to be in good contact with the part that passes the power to the wire. If this contact is not good, you will not get good current flow and what is happening can happen.

replace the wire with some brand new good clean stuff to check.
 
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Old 06-13-07, 03:29 PM
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Red face

Yeah, I had just put on a new roll cause I thought it may have something to do with it because the end of the last roll had been on it for a long time. But it didn't change. But I think I'll try to either adjust the temp range down or either turn the wire feed speed up some to see if that helps. Thanks for the help. I'll be back if it don't change though. Later, Grumpy
 
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