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Welding Shop

Does this welding transformer look bad?


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  #1  
Old 07-11-2018, 02:54:44 PM
SteveL SteveL is offline
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Default Does this welding transformer look bad?

So I have a basic 240v single phase ac dc stick welder I bought used about 10 years ago, and I figure it's about 20 years old now. Recently it has started to sort of pulse while welding. It's to the point that you cannot maintain an arc for more than few seconds at most. It seems to be pulsing around ever second or maybe a little quicker. Upon opening it up all I could find were some small bubbles on the winding of the main transformer. In pictures it looks like varnish that has dripped or run but there is no varnish on this transformer anywhere else.

So I'm wondering if this looks like the enamel breaking down?

Thanks in advance --Steve--
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Last edited by SteveL; 07-11-2018 at 03:19:12 PM.
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  #2  
Old 07-11-2018, 05:26:01 PM
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Default Re: Does this welding transformer look bad?

Those bubbles are from where the varnish cured. So far so good.
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Old 07-11-2018, 06:17:43 PM
slip knot slip knot is offline
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Default Re: Does this welding transformer look bad?

Looks normal to me. Black and crumbly is when you get nervous.
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Old 07-11-2018, 06:21:44 PM
Vanman Vanman is offline
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Default Re: Does this welding transformer look bad?

Do the symptoms occur on both AC and DC?
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Old 07-11-2018, 08:55:05 PM
SteveL SteveL is offline
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Default Re: Does this welding transformer look bad?

Yes it's on ac and dc. But does seem to be less noticable on dc, but still there. I think I could almost manage to maintain the arc on dc where as ac could not. Also I should add there is no electronic pulse or hi freq or anything like that on this machine.

---------- Post added at 08:55:05 PM ---------- Previous post was at 08:53:45 PM ----------

I would think varnish too but there is no sign of it anywhere else, which is why I thought it might be the enamel coating
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Old 07-12-2018, 01:10:32 AM
Vanman Vanman is offline
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Default Re: Does this welding transformer look bad?

Hmmm... I think I'd look for loose connections then. Both within the machine as well as in its supply circuit. Could even be a breaker with bad contacts.

If the transformer was failing, it wouldn't last long before it made itself readily apparent.
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Old 07-12-2018, 01:20:08 AM
Power Power is offline
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Default Re: Does this welding transformer look bad?

Quote:
Originally Posted by Vanman View Post
Hmmm... I think I'd look for loose connections then. Both within the machine as well as in its supply circuit. Could even be a breaker with bad contacts.

If the transformer was failing, it wouldn't last long before it made itself readily apparent.
Concur with Vanman. Also check the cables, connections at welder, and inside stinger.
I once had a corroded connection inside stinger play havoc on my welds.
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Old 07-12-2018, 01:34:15 AM
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Default Re: Does this welding transformer look bad?

We use our old Lincoln 225 a lot and am on the second set of cables, had to re do the stinger connection the other day and noticed that the copper inside the cable is black from over heating. I had noticed that it has been getting more difficult to start and maintain a good arc lately. I guess I'll have to pony up for new cables again.
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Old 07-12-2018, 02:33:55 PM
SteveL SteveL is offline
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Default Re: Does this welding transformer look bad?

Ah good point. I'll double check all connections then try again. I'll post results successful hopefully
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