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Weld on cast iron

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Scottf

02-02-2004 11:57:54

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I just welded up a crack in a cast iron tractor frame. I've welded cast iron many times before without a problem. I know the process and took my time and did right. I used nickel rod. This is the first time the weld was exactly the same color as the cast. Usually the cast is a bit darker. All seemed to go well and it looks good but I noticed something strange. When I pickup some of the some the iron grinding dust from the floor and sprinkle it over the weld the dust attaches in a line were the weld meets the cast. You can see a perfect outline in iron dust of the weld. The dust raised and when you wipe it away you can't see any crack but I was worried that this may be like a magna-flux test showing a crack. Is it possible that the weld has pulled away from the cast?

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John

02-03-2004 12:22:15

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Re: Weld on cast iron in reply to Scottf, 02-02-2004 11:57:54

Arc welding does create a magnetic field. Since the metal is lining up as if it were a crack, I would suspect a crack. I am not a fan of nickel rod. It does work on some cast if the moon is right, and the birds are chipping in tune and there is enough dirt left to fill the post hole. That being said, find someone with a cast welding torch and cast powder similar in properties to the piece you are welding and spray weld it with cast powder. Preheat then bury in the sand after welding or wrap in ceramic blanket. You may never have a problem with that weld, but get someone to check it with magniflux just to make sure. The normal place to crack is beside the weld where the two metals meet. The torches for cast powder are not real expensive and do a wonderfull job if you follow all the rules for cast. The weld will be the same color and equally as machinable as the origianal material.

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Harrison

02-02-2004 20:36:24

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Re: Weld on cast iron in reply to Scottf, 02-02-2004 11:57:54

Sounds like a T-bone Question to me.

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RAB

02-02-2004 15:32:36

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Re: Weld on cast iron in reply to Scottf, 02-02-2004 11:57:54

No, it just means the welding material is magnetic.
Regards, RAB

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Mark

02-03-2004 06:10:37

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Re: Re: Weld on cast iron in reply to RAB, 02-02-2004 15:32:36

Very interesting observation. My brain is saying, how did the ground off iron, become magnetized?

Only 2 ways I can see: 1. It was rubbed on a magnet or 2 it passed through a magnetic field.

If we are talking about residue from grinding off the weld, the "sparks" could have flown past the body of the grinder. With very small particles (which they normally are) and a big grinder (1 to 2 hp) this is highly possible. Apparently the magnetic field, generated as the grinder motor turned, must have been strong enough to extend well outside the body of the grinder such that it could influence the sparks as they went by.

Hmmmmm mmmmm mmm....very interesting.

Course, the softer the ferrous material the more easily it is magnetized and I usually grind steel, not Iron, which is much softer and more easily influenced.

Mark

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