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Tool Talk Discussion Forum

Re: Hobart welder/generator question

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John T

10-29-2012 10:17:14

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Carbon rubbing against copper (or silver or whatever is used) makes a pretty good low resistance electrical contact, I dont think I would like WD 40 to come between or interfere with or add resistance, or even conductivity where it may NOT be wanted.

HOWEVER (1) There is something to be said to reducing the coppers (or silver or whatever material is used) reaction with oxygen (oxidation) which some sort of temporary surface coating could reduce and THEN REMOVE IT PRIOR TO USE but

HOWEVER (2) As soon as the genny spins, the carbon brushes should quickly polish off any oxidation that may have occurred during periods of setting !!!

SO I DONT THINK I WOULD USE WD 40, maybe some sort of electrical contact cleaner if and when necessary

NO WARRANTY chemistry and material science arent my cup o tea. Hey WD 40 can provide a coating which reduces oxidation and it has cleaning properties, but I just dont like the sound of what that old timer said fer some reason ..............

Ol John T and all

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36 coupe

10-29-2012 13:32:26

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 Re: Hobart welder/generator question in reply to John T, 10-29-2012 10:17:14  
I have started many ac generators by pressing on the brushes with a pine stick while the generator is turning.Oxidation on copper insulates.Repulsion induction motors have the same problem.Works on old auto generators too.

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John T

10-29-2012 15:09:52

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 Re: Hobart welder/generator question in reply to 36 coupe, 10-29-2012 13:32:26  
Yeppers the oxidation isnt as good a conductor (as the copper or silver etc) but one would think after a few turns the brushes should have all that cleaned off. When I was a used tractor dealer I could often clean up the commutators and exercise the brush hold down springys and get the brushes back down n they would start gennin again

John T

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