Wall thickness bundle of snakes exhaust?

[Dave Grispen]

Hello Fellow members,

I want to make my own bundle of snakes in stainless steel, but would like to know what wall thickness to use for the exhaust. Maybe someone on here made some them self.
I need to know in milimeters.

Thanks in advance

 

[Fred W Ballinger]

When fabricating headers it comes down to what tube you can source. And bend, if you have faciltites to do that. If you can't bend then you have to cut and weld pre bent elbows. I would use 1.2 mm wall thickness. It's the default in the food industry.





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[Jerry Irwin]

Hello Dave,

I am just in the process of making my own 'snakes'
I have mocked up with 3 d printed shapes ( 22.5 deg sections that clip together ) and intend to start cutting up a load of 90 degree bends in stainless and tack weld before seam tig welding...
Its not an easy task and i suspect will take a few weeks to complete.
my wall thickness is 1.5 mm

Regards

Jerry

 

[Adam C.]

It depends on the material.

With 304 stainless you can go as thin as 0.048” (18 ga). Weld with 309 rod

With 321 stainless the min thickness is 0.035” (20 ga). Weld with 347 rod.

In either case, back purge the pipe. If not, go up one thickness to help compensate for the degraded weld joint.

 

[Brian]

If you can't backgas, there's a product called "solarflux". It's a powder you mix into a paste with lacquer thinner or acetone and brush onto the backside of the area you're going to weld. It makes a glass like coating when the metal gets hot and protects it from contamination. Not NASA grade or food grade, but OK for an exhaust if there's no turbo downstream. (the glass will flake off and blow out damaging a turbine)

Harris S0FB01Type B Solar Welding Flux 1 lb. Can Free Shipping | eBay

Solar Flux has been producing X-Ray quality welds in Stainless Steel for over 60 years. It can be used with any gas or arc welding process, ie; TIG, MIG, SMAW. As a result I began to take on stainless steel welding jobs that I otherwise could not have successfully repaired.

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[Jerry Irwin]

Don't forget that the wall thickness 'thins' on the outside of the bend...so might drop to as low as .75 mm

Regards

Jerry