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Cast iron welding


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Anyone here done much cast iron ARC welding? I want to weld up this, 700mm x1000mm 45kgs, i got some of those high nickel rods witch recommend no pree heating and just peen the weld.

I was going to drill the ends of the cracks and work my way to the middle with a stich with a long cool down time, and possibly de stress the whole thing after? I have a cast iron plate I was going to make a patch from.

 

Sound like an ok plan? 

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Yeah just try a small bit, it will become obvious whether its working or not. Those rods go mean on the tig just scrape the flux off and wire wheel the rod. Use as your filler rod for all the dodgy repairs. Used them recently to weld up some holes between the vanes on a triumph 2000 water pump for old barry mate. Apparantly its still going mint, he refuses to replace it as reckons its a long term repair. 

Was quite a good repair to do as was the gunkiest place to repair, super grot super shit casting but still welded good.

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51 minutes ago, JustHarry said:

What are these rods you speak of? 

I've got to fix a crack in the top plate of my coal range just at the thin part that goes around the flu . I dont want to recast is as it's a big piece 

Does brazing work? Maybe with a gusset

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https://www.globalweldingsupplies.co.nz/range-page.php?sku=R_WEIP2KG

They are very expensive but seem to stick shit together, i dont know about nice looking welds.

Brazing would work.

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I've done quite a bit of repair brazing on CI. Replacing broken fins, broken flanges on cylinders and similar. There's a specialised flux available for this work - and it works. I've used Manganese Bronze rod and Nickel Bronze - no noticeable difference. If you've got the gas welding gear, a pot of the flux is worth getting.  

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4 hours ago, GregT said:

I've done quite a bit of repair brazing on CI. Replacing broken fins, broken flanges on cylinders and similar. There's a specialised flux available for this work - and it works. I've used Manganese Bronze rod and Nickel Bronze - no noticeable difference. If you've got the gas welding gear, a pot of the flux is worth getting.  

Welding fins on is easy, I mist have done 100s of them.

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