Welding cast iron

[czechsonofagun]

This is a forge blower that I want to fix. It is some kind of a cast iron, never welded it in my life. I was going to use a stick welder but not sure about the rod. Nickel 99? Should I grind it to make space for the weld? I don't have the capacity to heat it up, was planning to weld it cold.

What rod would you use? Any special settings?

 

[fried1765]

This is a forge blower that I want to fix. It is some kind of a cast iron, never welded it in my life. I was going to use a stick welder but not sure about the rod. Nickel 99? Should I grind it to make space for the weld? I don't have the capacity to heat it up, was planning to weld it cold.

What rod would you use? Any special settings?

If you want that to be a lasting fix......take it to an experienced PROFESSIONAL welder!

 

[Fallon]

about the rod. Nickel 99?...

I don't have the capacity to heat it up, was planning to weld it cold.

What rod would you use? Any special settings?

Nickel 99 worked OK for me on my 1 cast iron repair.

You don't have a kitchen stove, or BBQ or camp stove, camp fire or electric space heater? They all work for pre-heating to various degrees.

 

[KWentling]

If your not going to preheat it, use the back step method of 1" long beads and wait between beads until you can hold your hand on the previous weld. The 99 will work fine.
I don't know what the latest recommendation on peening welds are now. Used to always peen them, then it wasn't recommended.

 

[czechsonofagun]

Thank you, gents.

Should I just stick it together where it broke? Or grind it to make V weld?

 

[yomax4]

It's going to move around on you when you are welding it. Sometimes it helps to bolt it to hold it close to where it goes. Slight bevel never hurts. If using 99 I like to peen it a little to relieve welding stress. I also like Nickel Silver brazing rod for things like this. Very strong and ductile. If you don't have 99 already you could also use Super 120 or Super Missile Weld 3/32. Good luck on this fun repair.

 

[hosspuller]

I would braze a gusset to the flange along with brazing the break. It's a blower so won't see brazing heat in use.

 

[yomax4]

Good idea on the gusset or gussets

 

[user.69169]

WHY???
Brass job at best, Everdur wid single carbon probably better.

(removed)'s Old School, NEVER grind cast, especially s#!t cast like dat. Guy who poured it had no idea what got melted fer dat run, you got none either. Chip or nap light and sand blast to clean up.

Bed it in pan of new kitty litter fer alignment. Better if fixtured to hold alignment. You dealing wid a flange. Gonna want to walk or kinkk, nature of flanges.

Run tackup from inside pipe, verify alignment finish job from outside.. Add couple gussets between bolt holes.

 

[void777]

I second taking it to a pro cast must be welded under controled heat.