Cast iron repair

[Mark 2]

Mincer, still being used I think.
Pre heat and stick?

 

[pressbrake1]

I’d braze it

 

[Screwdriver]

Plusone for brazing. Because it's such a thin section, you might be able to Tig braze it if you don't have oxy kit.

 

[The_Yellow_Ardvark]

OA and braze.
Done a few similar in the past.
The best tip is get both parts equally as warm

 

[Mark 2]

Thanks gents.

 

[The_Yellow_Ardvark]

@Mark 2

If it is a common device you might find a donner on line or local.
Do we have a picture of the whole machine

 

[brightspark]

braze is best . v it out flux it .preferable to generally heat with a propane torch and use oxy acet round the repair

 

[tom2207]

and cool it slowly , even after braze a bit of post heat can do no harm ,, not sure it does much good but I feel better knowing its got the best chance it will ever get.

 

[pressbrake1]

If you’ve got Instagram check these boys out

 

[Shedendman]

Personally,i dont think brazing will hold that,not if its still being used,i'd rod it,my two bobs worth

 

[Brad93]

brazing just a strong as a cold stitched nickel weld if not stronger.

Hot welded with nickel, yeah probably a higher tensile strength in the weld metal but I still think it would fail at a similar strength in the parent material.

 

[Brad93]

I would braze that all day long.

 

[pressbrake1]

Personally,i dont think brazing will hold that,not if its still being used,i'd rod it,my two bobs worth

See post above yours, brazing not being still used!
If it bronze welded the filler is stronger than iron

 

[Shedendman]

Braze is a join of metals,not a fusion of parent metals,@Brad93 i agree may hold but under how much stress

 

[pressbrake1]

brazing just a strong as a cold stitched nickel weld if not stronger.

Hot welded with nickel, yeah probably a higher tensile strength in the weld metal but I still think it would fail at a similar strength in the parent material.

I don’t even bother with nickel anymore

 

[Brad93]

I don’t even bother with nickel anymore

It's a 50/50 process with nickel.

With brazing it's 100% guaranteed if done right.

 

[Brad93]

Braze is a join of metals,not a fusion of parent metals,@Brad93 i agree may hold but under how much stress

47ksi seems to be ringing a bell. And that's bloody strong.

 

[pressbrake1]

It's a 50/50 process with nickel.

With brazing it's 100% guaranteed if done right.

Totally agree. With nickel to work properly it’s got to be high grade iron which isn’t that often

 

[Brad93]

So for Castolin Brazing Rods

70ksi UTS = overmatching the base metal

25% elongation = at least 10% better than the base metal, less likely to crack.

47ksi adhesion = incredibly strong bond

For Castolin 224 (generally considered the best nickel rod available) = 50ksi UTS
Can't find any elongation figures for the rods but for the nickel cored endotec wire they quote 15% elongation.

So we can see, braze is stronger, less likely to crack, and causes no structural change or alloying to the base metal.

 

[Shedendman]

@Mark 2 go for the braze see how it holds up,hopefully good,let us know though