Not logged inAmerican Welding Society Forum
Forum AWS Website Help Search Login
Up Topic Welding Industry / General Welding Discussion / No arc in Mig welder!
- - By nivram Date 05-08-2003 01:52
I purchased a used Ck Systematics MP250 Mig welder. If you read my previous post I did not have a gun for it.

Today I received the gun for it and was happy to finally be able to start welding. It feeds ok, but i cant get any kind of an arc. With the spool gun connected i was able to get an arc. How ever the arc didnt seem so strong. I figured the spool gun was not made for welding steel. Is there anything i can check before sending my maching to a welder mechanic?

If I do end up taking my machine to a mechanic, what is the average rate I should expect to pay to have my machine looked at??

Any info is appreciated.

Marvin

Parent - - By kam (**) Date 05-08-2003 13:05
I would check your ground. Make sure the surface where you are grounding to is clean (free of rust, ect). Grind surface or wire brush it if you have to.

Good Luck

kam
Parent - - By nivram Date 05-09-2003 00:01
I tried that. Also tried cleaning the surface of where the gun plugs in. Can the wrong gun cause this condition? Any other suggestions out there?
Parent - - By dee (***) Date 05-12-2003 02:02
First, you might try a volt-ohm meter... even an inexpensive one at a ten dollar price range will tell you anything you need to know. It works better than the old tongue test, which, at weld current levlels, might be a bit excessive of a tingle and could tend to curl or even smoke your hair.

Second, without sounding heartless, rude or cruel I would like t comunicate to you the need for me/us to evaluate your level of training, experience and your capability to perform a safe, dependable repair on your equipment... If you dont own the test equipment it's not a big issue, but it's certainly an indication, if you don't know how to use it either, that you should perhaps send it out for repair...
...this site does indeed provide a lot of information, but it might be necessary to get a level of formal training in the basics first. Take it under advisement and think of safety above saving a couple of bucks.

I have never seen the wire feed unit you describe but a generality or two might help. First, I'd try to find SOME point on the power supply that does read weld voltage (on a VOM[meter]), tracing back from the contact tip of the gun through the wire feed system right on back to the inside of the power supply itself if need be, bearing in mind that the ground side of the circuit is as critical as the "hot" side. Somewhere you should find a connector or point that does show power, or it would suggest the welder is bad. Check your power at the outlet first before going any kind of nuts... read the voltage on the VOM to be sure. A continuity test of the gun from the contact tip to the machine connector may be confusing if there is a contactor or relay as I would expect. Work systematically and use logic; don't guess and jump around haphazardly.
It would be unwise to begin replacing parts without knowing howto test them first; just because power may stop at a relay does not necessarily mean the relay is bad... post any new questions

Finally, I have no idea of hourly rate or hours involved to fix your machine, so I am unable to comment on the second part of your question.

Good luck and regards,
d
Parent - - By nivram Date 05-14-2003 01:03
Thank you for your informative reply. Yes i do own a volt meter and have a basic understanding of it. I consider myself mechanicly inclined however i've never worked on a welder before. I've used my voltmeter to trouble shoot and set sensors in my cars. But as you mentioned i'd rather spend a few dollars than risk injuring myself. I'm currently trying to get a schematic of my machine from the mfg company. If i fail at that the machine will be headed to a repair shop.

I'm told their fee is $45.00/hr plus parts. I just want to make sure i'm not getting ripped off as i dont know what going rates are like.

Again thanks for your reply and this board is great.
Parent - By jwright650 (*****) Date 05-14-2003 11:04
I think the rate you stated is in line for most repair shops. Dee has given good advice as to systematically checking the components before condeming any parts as a bad part and replacing. It's a lot cheaper to get the correct part the first time around and less confusing if replacing that part doesn't do the trick. Good luck with your welder and post your findings when you get it figured out, it'll help the rest of us if we run into similar problems.
John Wright
Up Topic Welding Industry / General Welding Discussion / No arc in Mig welder!

Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill