welding question
 

i have a ihi mazda turb, what is the best way to weld or braze an exhaust pipe to the cast iron outlet on my turbo?

Re:welding question
 

just lay a fat bead on there with your welder

Re:welding question
 

i have always been told that cast will crack

Re:welding question
 

well...thats what everyone says, but it never happened to me. i think you'll be fine, especially since that weld wont have to be of much structural importance

Re:welding question
 

i will try it..... :o

Re:welding question
 

Go to the welding supply place. they will recomend a wire/stick for you. Don't braze it.

-David

Re:welding question
 

i heard (somewhere) that the IHI o2 was cast steel...
in that case... weld away

Re:welding question
 

most turbine housings are cast steel

Beau

Re:welding question
 

i'm just going to avoid this one..



wouldn't touch it with a ten foot pole, unless you paid me to, in which case, it's your money and you'll spend it how you want.

Re:welding question
 

Welding to cast can be done.Using the right rod it will hold.I've done one on a friends car and it holds.He's had it running for about 3 months and no leaks or cracks whatsoever.I even beat it with a 5 pound hammer after I welded it.Like 4sillypwr said go to a welding supply shop and tell them what your welding and the'll get you the stuff you need.Hope this helps.

Re:welding question
 

id like to hear your opinion

Beau

Re:welding question
 

ok....i had a scrap o2 housing here and took it to work, and guess what...i welded the ---- out of that thing....it did not break. i even had it cherry red. but after i was finished, i stuck it in a bucket of sand that way it would hold the heat and cool down slowly. it worked. i will post pics when i get my pipe welded on.
i stuck it in a bucket of sand that way it would hold the heat and cool down slowly.

Re:welding question
 

beau: welding to cast is one thing, welding to cast exhaust parts is a whole different ballgame, the chance of it cracking out is far too high to even justify it. it'd end up being cheaper in the long run for him to go to a machine shop and have them cut out the flanges for him and he can make whatever kind of manifold he wants.

yes i know it can be done, but there's just too much risk involved.

Re:welding question
 

risk of what?....that youd have to fix a crack?...these arent high stress parts really

Re:welding question
 

I was reading up on repairing cracks in cast manifolds. The best way to weld it, is to use a grinder and slightly grind off the sharp edges of the crack to make a triangle shaped indent for the weldling filler to pool in. But before you start welding you should use a acelatane torch and heat up the cast to a dim redish glow ( around 600 degrees C). Once its hot weld it with the appropriate rod/wire. Then let the whole thing cool down slowly. I guess you could put it in ur oven and set it on broil and slowly decrease the temp untill its cool. This is supposed to help the molecules of the metal to form the correct lattice structure with less fatigue. Knocking the weld while still hot with a ball peen hammer will also strengthen the weld.

So i guess you could apply this method to welding mild steel to cast....but i'm no welder, just a guy reading a book trying not to look like a dumbass ::)

Re:welding question
 

that's very true, but the timeline for cooling it is upwards of 24 hours.
not sure you want to be that patient. or know someone who has the facilities to do such a thing