- Chris McQuay here on
Unobtainium Welding. Did you just get your Everlast Welder and you already have a buddy ask you to help with his exhaust project. Or we're going to show you a quick and dirty way to do
a good job on some stainless or just a simple purge
set up with some tin foil and an extra bottle of gas. (upbeat music) So in order to get the gas
inside here and have it stay, we need to make some purge plugs. Basically a way to dam the gas in that we're going to provide
with the second bottle. So at one end you're going to have to roll it around your gas supply. Just undo it from the machine, if you have another machine. We just need an end to
get that gas in the tube. This'll hold it in. And the other end, you
just need to make a plug. We've got this one almost done. It doesn't have to be fancy, fold it up, (upbeat music) Jamming in there. A little bit of leakage is okay, you want a tiny bit. Because as we're purging, we actually want to
push the atmosphere out and fill it with argon. So some of the gas needs to get out as we're putting more in. So after you've cut your
piece, whether that's in a saw or with a zip disk. You want to get it as flat as possible. You can use a file going across the face. You also want to debug it by filing inside and out. And in a perfect world you'd have something just to prep
the outside lightly. Here we use this ScotchBrite. So now we've got our purge caps in. You want something to help
you make sure it's straight. Piece of channel, angle
iron vise on the table just to keep the alignment decent while you're purging until you get tacked. Okay, so as that purge,
we have our hose here hooked up to a second bottle where we can turn it on. And we want to stay down
around under 10 CFH. We don't want too much. So now that we've got our purge on, we're going to leave
that for a few minutes. Try and evacuate as much of that atmosphere as possible,
fill it up with argon. Well, we can do some
tacking while we're waiting. We want some purge in there for tacking, but it doesn't have to be perfect. So it's been purging for a little bit. So now we'll tack it. In a perfect world,
we'll tack in autogenous, which means no filler. If the fit up is good enough and you can get it zapped
together with no filler, it makes it easier cause you can keep some pressure on with your hands. So as we're tacking, we just want to use the
pedal to give us a puddle. Once they melt together,
you get out of the pedal. Now you can see here these pieces weren't perfectly flat so and now we have to deal
with the fitment issues. So we're going to want
to grab some filler, to get the rest of these tacks. So while you're talking this up, if you have a small gap like this, you just have to watch your purge flow. You don't want it to be too high or the gas is actually trying to blow your main shielding gas away. And you'll notice that because the tacks will go either
gray or dark blue, whereas the other ones
will be silver or gold. So we got all our basic tax on there. You want minimum of four. When the fit up isn't perfect like this, it's not quite flat. You're going to want to go more and I'll show you that in order to improve this Fitbit a little bit, once we have it all secured, we could use the tacks to
actually shrink the gap. you can see we've tacked at all up here. I used the beauty of weld shrinkage to close up that gap to almost zero. So you can see when you have about a 64th of an inch left there, which is fine we can weld over that. So we're just going to
brush all the tacks now before we start our weld. The other thing I like to do is we've got tacks in there so we can pull this purge plug and just have a quick look to make sure our purge is
actually working at this stage before we go and weld the whole thing and discover the purge isn't working. So if we look inside here, there's some color, but it's not completely sugared. So we have some argon in there, which is a lot better than none. Check and make sure that you don't need to seal up your tinfoil
a little bit better and we'll get ready to weld. So now that we've looked inside, we've got to plug it all back up and give it a few more minutes to purge out before we get back to welding because of course we've just let all that Argon out into the atmosphere. So now that we've waited for our purge for a few minutes to make sure we're mostly Argon in there, I have my 035308 filler to weld this 304 stainless tube and I have my gas lens on there and we're set at about 22 CFH. So when you're welding around a tube, we want to pay attention to trying to point to the center line of that tube. Nice and relaxed. Roll your wrist as you come around. Make sure you wait for that post flow. So when you reinitiate that arc, start back into your last dip, then get the pedal and the
puddle where you want it start dipping and moving forward. (upbeat music ) Now that we've got this
roughly half welded, we're going to remove these purge plugs and then we'll weld the
other half with no purge so we can show you the
difference between the two. Okay, so now we're welding
without purge inside. So you'll see inside where glow and red and without the argon we're going to get what they call sugaring. Basically chromiumoxide. So another thing you'll notice is that the weld wants to be concave when the sugaring has happened. So you're going to have to jam more filler rod in there
if you're not using purge. Okay, so from the outside
that's not super obvious, but it does want to be concave. And because it's oxidizing inside, because I'm getting full penetration, the puddle is wandering
around a little bit too. So you're not going to get
as nice of an outside ... A nice of a weld on the
outside as you will with purge because of all the detrimental stuff that's happening inside the tube. So now that we're all done, let's cut this apart. We'll take a look at the inside and the purge and the non purged and we'll show you the difference (upbeat music) Here's our demonstration. You can see here we have some purge. It's not perfect, it's not silver. So we had some leakage in our tinfoil, but you can still
definitely see the ripples and you can see some good colors in there. Golds and pinks. On this side, we have
very obvious oxidation and you can see because of the oxidation, that line between the
two tubes stays behind. It doesn't actually
fuse on the bottom side because the oxide don't want
to join with each other. So this is what we don't want. No purge. This is some purge, not perfect, but way better than this. So that's how you get
a decent quality purge with just some tinfoil and an extra bottle of argon when you're doing your
buddies exhaust jobs. I'm Chris McQuay Unobtainium Welding Weld Mean, Weld Green. (upbeat music)
