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ARGON BACKING SHIELD FOR TIGING STAINLESS

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Hey all,

 

Using argon backing shield for TIGing stainless intakes and/or exhaust, definitely worth it? or can you get away without it?

 

Cheers.

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Well you can't not use argon.. It just won't work. You can either use pure argon or a mix

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Depends if your welding stainless and penetrating all the way through or not

 

Stainless 1.6mm thick exhaust systems I don't back purge

 

Stainless steam pipe manifolds I back purge

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Well you can't not use argon.. It just won't work. You can either use pure argon or a mix

 

I meant purging argon through your pipe while TIGing to prevent oxidisation of the inside of your weld with stainless, not just using argon, i prob didnt word it quite right,

Cheers STR8E.

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If thin walled stainless I would purge if you want smooth inside for better flow, but depends how much heat your putting into it and how much weld is pulling though

 

Nitrogen is better for purging than argon but it will do the job

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If you're just fuseing 1.6mm stainless for an exhaust system ect. you dont need to purge as there isn't any pen, but whenever I get pen I always back purge. Sometimes its hard though, I generally use a wet rag wrapped around the argon hose with another wet rag blocking the other end. You can't do that when your welding over the end/rag. Or when making a v-band system I tac'd the system togeter with a mig and made up caps that fitted the v-band clamps. But thats rare as a v-band assembly cost RRP$110 odd. How do others purge stainless exhaust systems when tig'n? wet rags ect?

And whats cheaper Argon or Nitrogen and by how much, because I only use argon for purging and if Nitrogen alot cheaper, I'm going that way.

Edited by HELLBOYs80

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Thanks for the feedback guy's ;)

Nitrogen can be used as a purging gas & is cheaper, FAR CHEAPER than argon but the bottle regs are not cheap and hard to find. The price difference between an "e size" cyl of Argon and Nitrogen is $70 and a reg is around $100.

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I use cooking foil for making blocking ends If it's a small o.d pipe

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What's wrong with masking tape? Or foil tape if you can get your hands on it.

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if its a really big pipe then this is how we do it

 

IMG_1280.JPG IMG_1284.JPG

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What's wrong with masking tape? Or foil tape if you can get your hands on it.

 

like this

petes_manifold_21.jpg

 

nothing wrong with doing it like this

i just cant be bothered using welding tape ( not unless its given to me at work )

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if its a really big pipe then this is how we do it

 

IMG_1280.JPG IMG_1284.JPG

 

For that size pipe are you using tig or stt?

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We do a tig root on all our stainless stuff and alot of the time it's all tig, so much cleaner. I only use stt on carbon stuff really.

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Yeh ive only ever used STT for carbon too just wasnt sure if people were using it for stainless yet

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if its a really big pipe then this is how we do it

 

IMG_1280.JPG IMG_1284.JPG

 

For that size pipe are you using tig or stt?

If its stainless its tig from start to finish

If its mild steel its tig root run and capped of with stick

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