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Tool Talk Discussion Forum

Re: Newbie welding questions

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Author  [Modern View]

03-16-2013 19:06:38

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The problem is the cast iron. To weld Cast, it's not as simple as grabbing a rod of 6013 and going to town. You need either Ni rod or cast iron rod (Stainless would work too), but those options are expensive so not always practical. Cast iron also needs a pre-heat to bring it up to about 400, and then at the very least a slow cool by wrapping it in a welding blanket or burying it in warm sand (a post-heat step would be better). Cast can and will crack if not welded properly.

If welding a crack, it's also a good idea to drill out the end of the crack so it won't keep spreading.

Many others on here can give more advise.
The basics are, you can't weld cast iron with 6013. 7018 has given some people better results, but your milage may vary.

Donovan from Wisconsin

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William Fissell

03-16-2013 19:11:06

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 Re: Newbie welding questions in reply to Don-Wi, 03-16-2013 19:06:38  
Thanks, I had thought the problem was later stress relief and cracking, which shouldn't be a real problem for my particular part. Is the substrate metal also causing the crummy weld quality?

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03-16-2013 19:43:16

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 Re: Newbie welding questions in reply to William Fissell, 03-16-2013 19:11:06  
It depends on the cast. Some of its good and some isn't. Exhaust manifolds are always a bear to do....full of impurities and brittle.
Like was said, nickel is best for cast but spendy.

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William Fissell

03-16-2013 20:10:42

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 Re: Newbie welding questions in reply to IrvIA, 03-16-2013 19:43:16  
The repair part is a cast cap for a Dearborn 10-80 plow bearing box. I'll probably pay someone (TOH) to turn a replacement,but thought I'd fool around trying to patch it first.

On a grinder the sparks are short, orange, and burst into little sparks about 12-14 inches from the grinder, so I assume its cast iron.

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