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1965 portable welder model 400037 300Amps 40Volts rheostat burned out. What is there for a replacement

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  • Dave Carlberg
    Dave Carlberg Apr 06, 2015

    The welder is a Stick welder with the serial# 12CW39551 spec 4296. This is a large portable welder used at a construction site

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  • Welding Tools Master
  • 45,301 Answers

Contact the mfg only they will know .

Posted on Apr 06, 2015

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The 3 slip ring models are similar but have 2 rotor windings - take off the wire from the middle brush and measure from it to each of the ends.

If your rotor and brushes checked out OK you should next check the fuse in the exciter circuit, this will be on the block where the other end of the brush wires go.

If the fuse was good you need to do an excitation test. This is a bit dangerous so be careful. Look at the schematic pasted inside the case and figure out which brush is the positive (+) one. The wires are numbered and so is the schematic so this isn't as hard as it might seem.
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If you didn't get AC at the outlets and DC at the weld terminals above, something is wrong with the stator in your welder. If you didn't measure any DC on the wires that go to the brushes (most likely thing to happen), you've got something wrong in the exciter circuit. Check the rectifier, the capacitor, the exciter winding in the stator, and lastly the current control board. Older welders will also have the fine current control rheostat in this circuit (look for burned windings on it).

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