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Was given an Airco welder-- have a few questions

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Darren in TN

04-04-2005 20:03:53




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Howdy, all.

I've learned a lot from reading welding threads here and I really appreciate all the info you guys have shared. My gradfather gave me an Airco MSM Stinger II 225amp AC welder. I plan on using it in my garage for some light welding-- making a linkage for my plow, repairing my mower's deck, etc. Have any of y'all had any experience with Airco or this specific welder? I've been told it's about 30 years old.

Also, I wasn't given a manual, so I read Lincoln's AC-225 manual since it is similar. That manual says I should use a 230v, 50amp fused circuit. Is there a reason not to use breakers in the place of fuses? (The Airco's case lists a short-circuit current of 75amps... that has me wondering if I don't need to run a heavier-duty circuit.)

Thanks in advance, folks.
Darren

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Bus Driver

04-05-2005 15:36:08




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 Re: Was given an Airco welder-- have a few questio in reply to Darren in TN, 04-04-2005 20:03:53  
Unless the welder specifically states differently on the data plate, assume that it is 20% duty cycle.



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dr.sportster

04-05-2005 14:39:17




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 Re: Was given an Airco welder-- have a few questio in reply to Darren in TN, 04-04-2005 20:03:53  
Fuses are much more protective of a circuits wiring than circuit breakers.Short curcuit amps is not the spec you need.It would probably work with a 2pole 50 amp breaker.If you want to do it their way you need a two pole 60 amp fused disconnect with 50 amp fuses.There is no 50 amp disconnect switch in fused or non fused.



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Coloken

04-05-2005 06:03:02




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 Re: Was given an Airco welder-- have a few questio in reply to Darren in TN, 04-04-2005 20:03:53  
"Short circuit current 75 amps" You want breakers or fuses that WILL blow befor this if short circuited. If you used 75 amp ones, it might just sit and smoke. Good example of older books not knowing about newer technoligy. Use breakers.



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Big Jim

04-06-2005 03:20:50




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 Re: Was given an Airco welder-- have a few questio in reply to Coloken, 04-05-2005 06:03:02  
A short circuit condition is absolutely normal with a welder. It happend every time you strike an arc or stick an electrode.
75 amps is the maximum load the welder will ever place on the line in normal operating conditions. I've run a 225 buzz box on a 50 amp breaker for years and never had an issue. Breakers are inverse time-current devices. They will take large currents breifly or slightly over their rated capacity for a long time. They are perfectly happy in ordinary welding operations.
Many instructions specify a XX amp fused circuit when they really mean a circuit with XX amp overcurrent protection.

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Darren in TN

04-05-2005 06:24:23




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 Re: Was given an Airco welder-- have a few questio in reply to Coloken, 04-05-2005 06:03:02  

Good info, guys. Keep it coming!

Thanks,
Darren



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old

04-04-2005 21:12:32




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 Re: Was given an Airco welder-- have a few questio in reply to Darren in TN, 04-04-2005 20:03:53  
50 amp brakers work as well as fuses do.



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