Stainless Steel Exhaust Pipe - Circle to angle/oval in mandrel bend

[DaftAmbrose]

Hi everybody,

First post. I did some digging and couldn't find the answer I'm looking for.
I'm designing my first custom exhaust for a motorcycle. I'm using the old exhaust as somewhat of a template. It's a slipon exhaust that connects to the header.

I'm having troubles figuring out how they got a specific weld done. specifically, where a straight pipe connects to 90 degree bend midway through the bend. Picture included.

You can see where the angled mandrel bend abruptly turns into the straight. The way I see it, the straight is cut flat at the end, perpendicular to the direction it runs. The curved portion is cut at an angle, making it an oval edge.

So how do I get them to flush up?

 

[Misterg]

The way I see it, the straight is cut flat at the end, perpendicular to the direction it runs. The curved portion is cut at an angle, making it an oval edge.

Hi, and welcome.

I think I can see three joints in that picture, all pretty much cut on a radius:

Which one did you mean?

 

[DaftAmbrose]

You definitely have a more keen eyec than myself. I didn't even notice those other cuts.

I am referring to the farthest left cut.

 

[chrismac]

I would just mitre both cuts so they fit more or less even and weld up, some fettling when tacking will pull or push the thin wall pipe into place.

 

[frank horton]

I'll need to make 4 very soon for my new project....might even just pay somebody to do the whole job as I have no TIG and want it in 316 st/st....

 

[Popcorn]

There not actually cut's, it's where the pipe has deformed where it's been bent into shape when it was manufactured.

 

[chrismac]

There not actually cut's, it's where the pipe has deformed where it's been bent into shape when it was manufactured.

I was thinking this was the case..... but the OP must need to cut and shut to make his exhaust.

 

[dieselsamurai]

Its a very tight inner radius at the top most bend to have been bent by a machine is that possible ? There appears to be more metal in the outer radius and it has a sharp angle on it where it would normally be stretched thinner