TIG Welding Stainless Exhaust | Twin Turbo Mustang

TIG Welding Stainless Exhaust | Twin Turbo Mustang


welcome back to another episode of the
fab forums today I work on the stainless exhaust for the twin-turbo ride now this
exhaust is a combination of stainless and then it changes to luminal about
about the start of the transmission so picture kind of like a long tube header
where a long tube header would end is where the aluminum is gonna start and
run out the back I’ve had a lot of people sceptical about the aluminum
exhaust but it’s actually used pretty widely in the racing world as a matter
of fact they’ll do aluminum straight from the turbos longevity may not last
as long in the racing world but the fact that I’ve got stainless running probably
the first four feet and then turning into aluminum on the way out the back I
think it’ll I think it’ll last longer than most would think I’ve actually done
this on some previous turbo setups with no issues so now I have been fitting the
stainless tubing on this car in previous episodes but I didn’t ever I’ve never
finished welded everything was just kind of tacked together and pieced and tacked
and pieced intact this episode I finish it so we’re gonna back purge we’re gonna
weld up all the stainless get it all put back in the car for the final time or at
least I hope it doesn’t have to come back out so the first thing I did is I
just made sure that everything fit exactly the way that I wanted to fit it
all tacked up nice and clean everything was all the fitment was proper before I
took it over to the table and finish weld it when it comes to welding stainless or
any really exotic metal for that matter you have to back purge it which means
you have to replace the ambient air on the inside of the tubing with argon to
shield the backside of that weld if you don’t if you don’t basically back purge
the inside of the tubing what’s with argon what will happen is when that
stainless heats up and not weld it’s kind of penetrating through the backside
it will what they call sugar so it’ll kind of crystallize and create this
really hard crusty crystallization it is very prone to cracking and you don’t
want pieces of that chipping off or actually causing cracks within your
tubing so just like argon shields the weld on the outside of the tubing you
need argon on the inside of the tubing to do the exact same thing basically the
way that you do that is you place a tube from your argon tank and back purge that
tubing now to get the argon to stay in the tubing you’re going to cap the ends
on both both ends of the tube the way that I like to do that is just use a
little bit of tin foil fold it in half this is a piece of aluminum but it’ll
give you kind of the idea I’ll usually just tap one end very similar to that
the other end kind of do the same thing except for it
I’ll wrap the tubing around the back purge tube itself and cap it off and
then basically just free flow some argon in there for a minute or two to kind of
push out all the ambient air and that’s really why you don’t need this to be
perfectly sealed as a matter of fact sometimes I actually put holes in the
top just to kind of let the ambient air out the argon is heavier than outside
air so the argon is going to sink to the bottom and as it feels it will
discontinue Li push out any ambient air that’s left in there and then you just
let that argon flow while you’re welding your tubing and so you’ll weld up all
your joints to water by UV bands you get all that stuff done and if it’s done
properly once you’re done and you take it all apart when you look on the inside
of the tubing the weld itself should look
as nice and as clean as the outside of the tubing so post a lot of pictures on
Instagram of when I was welding these up I had a lot of questions about tin foil
so that kind of answers it for you they’re just my makeshift plugs once I had all the tubing TIG welded up
I just cleaned it up a little bit with a scotch brite and then those two lower
sections of the exhaust so the stainless portion of the exhaust is in two
sections just so I can take it apart you have the upper section the upper down
pipe that is directly connected to the turbo and goes down into the fender and
then there’s a V ban and then the second section goes from there back to the
beginning of the transmission of the bell housing so basically the entire
exhaust on both sides is basically four pieces you have the upper section in the
lower section the lower section on both sides I wanted to wrap and some kind of
heat barrier for several reasons it’s kind of close to these struts I don’t
think you get hot enough to bother the struts but just in case go ahead and
wrap all that stuff and then on the passenger side there’s a lot of
electrical that actually runs pretty close to there you have the starter wire
you have the main ground cable that comes to the back of the engine you have
some other power wires and so to keep it from kind of heating those up as well
and it’s pretty tight on that side and you want to heat the floor pan and all
that stuff I actually wrapped all that as well once I had everything entirely wrapped
and welded was ready to put back in the car because mounted a lot stuff up under
there for the last time or at least I hope it was the last time and I will
finish the aluminum section of the exhaust I’ve already got couple pieces
made I kind of how I want to do it not really concerned with it I can actually
drive the car the way it is right now it can go to Fox
tober fest the way that it is right now I can go then you shop the way that it
is right now I really want to take my time on the rest of this and make sure
that it’s nice and tucked up under the car and looks good and everything’s
parallel and nice and neat I just want to make sure that the aluminum section
of this is super nice and neat you know you don’t want to see I think kind of
hanging out from underneath the car and whatnot from the side and essentially
the turbos active as mufflers in a way kind of quite ins it down a little bit
so for the time being I can kind of move it around and drive the way it is I
don’t worry about any of those leaks that were in the tune because the cracks
hopefully I can get a good air fuel ratio reading now an accurate one and
the car should run as its supposed to all right guys that’s it for this
episode of the stainless welding on this car I hope that kind of cleared up some
of the things that you may have questions about as far as back purging
goes and I had a lot of questions about the aluminum on Instagram so there you
go that’s kind of why I use the aluminum there are probably better and more
precise ways to back purge and a lot of guys use dual regulators you have one
regulator for your back purged you have one regulator for your TIG torch I
didn’t have mine set up like that I rarely do
stainless work and need to back purge and stuff so a lot of those guys that do
that on a regular basis have dual combo setups try to save a little gas I
probably use more gas and I needed to in order to get this accomplished but this
will really be the last stainless I do until I build the manifolds and turbo
piping for the big sir so maybe by then I’ll have another regulator I don’t know
I just don’t do that much of it and the way that I have it set up works pretty
good you may have also noticed that in the footage I’m using Michael Furey
new tic cub anyway the white one that I was using is the new Fupa 12 from
Michael Furyk Furyk cups I’ll put a link in the description you go check it out
but I’m gonna do a feature on that teacup soon so I featured the first Fupa
the clear ones probably episode like five of you need this tool and I’m gonna
feature the newest one you know you need this tool video too so
you’ll get to see it there soon alright guys that’s all I got for you today
should have some footage up soon of the new shop another people been asking
about that can I actually show everything on the
channel so moving in building some of this new benches and stuff that we’re
gonna put in there organizing it all that stuff should be on the channel so
just stay tuned for that October 1st is the official date I’m still waiting on
the owner of the building to clean up a little bit and fix a couple little
things so soon should be seeing you should see some stuff as always thank
you for joining me I will see you guys some more this week go do work son

0 thoughts on “TIG Welding Stainless Exhaust | Twin Turbo Mustang

Leave a Reply

Your email address will not be published. Required fields are marked *