TFS: Why You Need to Back Purge

When it comes time to decide whether or not to back purge your piece, it may help if you have this information in your brain. In this quick tip episode, Justin the Fabricator explains why you should back purge stainless used in the Automotive Performance Fabrication Industry.
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[@michaelcostello6991]

Thank you. the info is just brilliant.

[@scod3908]

For a novice welding a stainless exhaust for a diesel - is solar flux going to be adequate or would you recommend investing in the extra gear to back purge?

[@Fosgen]

For small components you can make simple gas enclosure with gloves and TIG inside. For titanium, nickel and SS small parts it is best. You save a lot of gas too. Zero flow from TIG.

[@andreiv8186]

Why do i watch all your videos all over again everyday? :)) guess i love your videos!

[@TheFabricatorSeries]

Andrei V Always appreciated!

[@baldcreations8044]

I assume the one thumbs down is the guy who welded this in the first place, lol, just saying,

[@deejay4837]

This man knows a lot of his game! :)

[@rickparker4887]

To get my D1.1 stainless steel tig unlimited thickness The coupons were back purged. And doing food grade fabrication all the stainless pipe and tubes were purged

[@bubblef8073]

I have to weld tube and my boss is to cheap to buy an extra tank with valve and stuff to actually back purge Handrails.

[@rickparker4887]

And for great penetration on pipe or tube always key hole weld

[@TheFabricatorSeries]

Rick Parker Not necessary on this thin stuff, but I'm sure it's required on bigger.

[@john.bmethe3887]

if the part was welded in an argon chamber that would protect the inside of pipe/weld is that correct?

[@TheFabricatorSeries]

John. b Methe It would. I'd consider it a bit over kill for a single wastegate tube, but it would take care of it.

[@teamEP789]

you'd waste a lot of gas to fill the chamber

[@aidanbegaud5238]

I’m planning on welding a 60 litre (15 gallon) stainless water tank in a cuboid shape. My question is when do I start purging? Do I need to purge the tank once all tac welds have been done? Any advise would be greatly appreciated! Cheers

[@mpeugeot]

Thoughts on Solar Flux B vs purge in preventing sugaring and promoting weld strength? I think that it's doing a good job, but I don't have enough data to support that conclusion yet.

[@TheFabricatorSeries]

mpeugeot I use it. It works for me. Check out the Back Purge Video when you get a chance. I go over it.

[@jaredg8854]

Any recommendations on purge plugs for poor/cheap people?

[@carbonfiber492]

Jeff lutz said a couple weeks ago on a stainless works video he doesn't and doesn't see the point

[@TheFabricatorSeries]

carbonfiber492 I guess it's all up to the person doing it. I don't risk it because of pieces like this.

[@CrAzYDr1veR]

i would like to know why my exhaust pipe does not crack, it's welded with no purge and no penetration to avoid sugaring but has supports to avoid too much stress.

[@TheFabricatorSeries]

CrAzYDr1veR This is where it gets interesting actually. It gets further in depth than a yes/no/black/white explanation. Just because you didn't do it doesn't mean it will automatically fail. It just increases probability. The really tricky part is based on use. If you beat the smash out of it, you may or may not reach or mimick the same situation that causes stainless welds to fail. There's nothing that says "it will happen" - but you can be rest assured it won't be nearly as likely with proper practices in the same situation. If you need further explanation, I'll do my best.

[@CrAzYDr1veR]

no need i know that purged is better, it's just as strong as the original material with no cuts and welds

[@industrialpalletworx3548]

Do you need to back purge nonstainless tubing? Aluminum or regular exhaust tubing? Haven't done any of this but was asked and didn't have an answer

[@TheFabricatorSeries]

High Oktane Kustoms No. It is not reactive.

[@User15837]

Do you need to purge thin aluminum pipe ?

[@rickbrown7596]

what about fluxecore 308L for a mig to do an exhaust system out of 409 stainless? will the fluxecore provide enough protection or do you still need to back purge?

[@aesca151]

Do you need to back purge cold rolled steel?

[@wadehearn6230]

In the food industry, you better purge weld SS pipe/tubing.

[@MickeyWu7r5]

Their are ways around purging and still get good tig welds not everything can be purged.

[@TheFabricatorSeries]

Dominic Lamanteer I'm ultimately curious where you're going with this... Open mic - exclude qualifications.

[@hellagraphic3892]

I know this is a bit random but does anyone know anything about welding brass? Or anything antique like chandeliers primarily brass and cast iron?

[@Irishluckily]

Brew Master thinking the term you're looking for is brazing.

[@twwtb]

Keith Caron, Artist has some videos about tig brazing copper using ordinary electrical wire for filler. Weldingtipsandtricks probably has something too. Youll have to do some searching and experimentation.

[@DomsE36Garage]

No offence intended at all, however I think you need a slightly better quality camera for filming. Your videos are just that little bit blurry that its hard to see fine detail (yep, watching in 1080p). Just for example, I personally couldn't even make out the crack in the pipe and was hard to see the sugaring inside the pipe. Not sure if it's lost quality post production but just sometimes difficult to watch. Keep up the good work though, love the vids and will watch every new one you put out.

[@btrswt35]

I think he needs to lay off the caffeine.

[@TheFabricatorSeries]

David Mm "He" responds to comments. And "He" is not on a bunch of caffeine, but I get the joke.

[@TravisAndrew1]

Back purge isnt needed

[@TheFabricatorSeries]

Rusty Shackleford It would have helped this piece survive if it was.

[@DomsE36Garage]

No offence intended at all, however I think you need a slightly better quality camera for filming. Your videos are just that little bit blurry that its hard to see fine detail (yep, watching in 1080p). Just for example, I personally couldn't even make out the crack in the pipe and was hard to see the sugaring inside the pipe. Not sure if it's lost quality post production but just sometimes difficult to watch. Keep up the good work though, love the vids and will watch every new one you put out.

[@TheFabricatorSeries]

dominator293 I shot this with my front facing camera on my phone. I mentioned in the vid that I'm right in the middle of a job and not using the full production stuff.

[@DomsE36Garage]

Fair enough mate :)