I need to repair a crack in a cast iron wood stove. I have tried to preheat the welding area and it cracked again. What is the best way to weld a flat piece of steel over the cast iron section? Would this work or is there a better way to weld the crack closed? I have used 99Ni rod on it but I cant seem to stop the crack.
2007-09-05 00:50:12 · 7 answers · asked by rmatc4 2 in Home & Garden ➔ Maintenance & Repairs
Alumiweld company use to offer a product to fix cast iron with just a propane torch--not sure if they do anymore---check them out
http://www.alumiweld.com/h2uaw.html
Otherwise, this site has lots of info on fixing cast iron
http://www.locknstitch.com/CastIronWelding.htm
And this one
http://www.muggyweld.com/castiron.html?OVRAW=cast%20iron%20welding&OVKEY=cast%20iron%20welding&OVMTC=standard&OVADID=2628359012&OVKWID=28004062512
2007-09-05 02:35:26 · answer #1 · answered by paul h 7 · 0⤊ 0⤋
I agree that welding will add a lot of heat to an area of cast iron. It would need to be preheated pretty hot to prevent a large amount of differential expansion. Would help if you can evenly heat the entire stove. Might also try drilling a small hole at the end of the crack to keep it from continuing to run.
2007-09-05 12:53:22 · answer #2 · answered by Jeffrey S 6 · 0⤊ 0⤋
Try Cronatron.com they have cast iron rods. I would drill holes at the ends of the crack to relieve the stress prior to welding.
2007-09-05 11:20:00 · answer #3 · answered by Anonymous · 0⤊ 0⤋
i use to work in a foundry, we had to put the cast iron into a oven and heat it to cherry red before we could weld it then slowly reduce the heat to keep it from cracking, There is a low temp brazing rod now on the market, but unless you can heat the whole stove , expect it to crack again,
try drilling small holes Thu the patch and stove to bolt it on, using a high heat sealant to fill the crack,
2007-09-05 08:42:51 · answer #4 · answered by William B 7 · 0⤊ 0⤋
To properly weld cast iron you use a carbon arc welder. Not too many people do this but you may be ale to find a good welding shop in the yellow pages that can do it for you.
2007-09-05 23:27:19 · answer #5 · answered by Charles C 7 · 0⤊ 0⤋
Try using JB Weld. It's a two-part epoxy. I am not sure if it will stand up to the heat of a stove, but it does work patching metal pots and pans.
2007-09-05 12:02:54 · answer #6 · answered by big_mustache 6 · 0⤊ 0⤋
you have to Braze cast Iron. Regular welding doesn't work too well (as you've found out).
2007-09-05 08:22:34 · answer #7 · answered by mdlbldrmatt135 4 · 1⤊ 1⤋