Gas Welding: How To Gas Weld & Cut Steel, Aluminum & Cast with a Cobra Torch – Eastwood


if you’re looking for a complete welding
and cutting system and one great kit that you need to check out this
promaster gas welding torch kit from eastwood it is everything you need to
cut and weld steel stainless aluminum cast iron and cast aluminum and it all
comes in one convenient carrying case you get the pistol grip torch gun that
will allow you to cut everything from thin sheet metal 21 inch thick plate you
get nine welding tips from 13,000 up to a heavy 38 cut you also get curved and straight
extensions to help you get into tight areas it comes with over and under cutters the
undercover will allow you to do find sheet metal work and the over cutter is
for heavy plate you also get guide wheels for long
straight cuts it also comes with an air acetylene tip for body letting and
soldering you get cobalt blue glasses to reduce sodium flare as well as a wrench
and tip cleaner plus the instructions you need now let’s
see this kid in action as we cud well different types of metal ok and now let’s go on to some cutting
and welding with our DAC 2000 ok now we’re going to show you how to set your
pressure on our low pressure regulators for the oxygen and settling we always
won it four pounds of oxygen settling so we’re going to take our knob and
being that it’s four pounds our regular runs from 0 to 30 and now we
can go ahead and turn this right up to I put it at five pounds allow for one
pound of line loss and you want to set your gauge inflow not static positions
are going to pull my trigger and i’m going to pull that right into a bar
around five pounds and then I know I’ll get for at the gun when i turn the the
regulators on now let’s set up the settling and again i’m going to write to
about 25 mark and that’s going to allow me for at the gun so there we go now that was a flow
position don’t worry about where returns when you turn it off it’s consistent flow at five pounds what
you need all ready to go ok now I’m going to show you some
aluminum welding using the dhc-2 thousand we’re going to some thin body
aluminum here its own 35 and also going to show you some cast aluminum how we
repair a cast water pump might be a water jacket we can do it all with the torch so let’s
go here and do the body aluminum first I’m running at four pounds of oxygen and
settling let’s go ahead and do this well i’m going to use a nice soft neutral
flame this torch is very good at low pressure allows us to do the real thin
aluminum i use a little Harris high temp on our flux that allows me to get rid of
the oxidation on our aluminum and let’s go ahead and weld this up we’re going to
preheat and we’re dip it and dip out like we’re taking welding the side right here gives you a nice
clean weld hundred percent penetration to the backside a nice part about it has
a kneeling effect actually softens the metal not English wheel asana can hammer
it hammer weld it bend it shape it anyway we need to go so now let’s go on to the cast iron and
now we’re going to go ahead and weld some aluminum cast here we have an old
water pump this has a crack in the neck right here I’ve gone ahead and already bubbled this
out so now i’m going to go ahead and preheat the aluminum and then i’m going
to use a tick rod aluminum to Grodd 4043 to go ahead and weld this up so let’s
get going I’ve gone to my number two welding tip
on my torch allow me to get the extra heat and we’re
going to preheat a little bit before we start the aluminum absorbs the heat real
quick so i gotta knock the chill out of it and then we’re going to go ahead and
we’ll be right up let’s get a good and warm the aluminum
has to flow first before we can weld it same thing i’m going to use a little bit
of flux on my ride just allows me to clean the oxidation off park or a piece
we’re going too well all right you’ll actually start to see the
aluminum flow yeah it takes a little bit to get a little
hot enough but it has to be flowing before you add your rod yeah she’s starting to flow right now real
nice give your nice clean weld and this piece
is ready to go back on your card be used ok now we’re going to show you how to
set your oxy acetylene flame on the dhc-2 thousand what you want to do is do
about a quarter of a turn on your knob of your oxygen and settling and you can
let your flame up now you wanna bring this flame down to a neutral flame and
the neutral flame is when you get this real small cone at the beginning at
their very beginning the tip your torch you can see as I’m going in it’s still got a little feather on it
there we go now we’re into a neutral flame this if you go extremely on the
action inside you have what they call an oxidized flame that’s extremely hot and
that will burn your metal up real fast you do not want to operate this torch at
that flame I want to be right off feathers you see
me grow this feather i’m actually going to go ahead and add a
little bit of oxygen and now we have our Neutral flame and this is where i’m
going to well that so let’s get it starts go ahead and do
some welding on steel right now i’m going to use the tick why is my filler
nice thing about to Grodd is easy to get your local Welding store and it’s a
great clean rod to use for your sheet metal work now I want to attack the
beginning of my metal so it doesn’t move on me still has a lot of movement so we’re
going to attack it and then we’re going to go ahead and weld it up all right here we’re going to a nice
beat across the surface small precise flame gives you great penetration we’re keeping the heat down so we can
keep the distortion down also on our panels are welding now we’re going to show you how to cut
some thin sheet metal will be your body panel i will use are under cutter the
under cutter is good for ten thousands up to three sixteenth of an inch and
that is four pounds of oxygen and four pounds of settling so let’s go ahead and make a nice cut on
this old 35 sheet metal this would be about your 20 gauge again I’m going to
get a neutral flame but a very soft flame just to get me started because what we do is we actually use
oxygen only in the bottom to allow for a nice clean cut across our panel so let’s give this a shot here so it
looks like i’m going to preheat the front edge bring the bottom in and i’m
going to drag it right through the panel going to give you a nice plasma light
cut with a nice clean edge very little slag on the back side let’s do one more
cut and we’ll do one cut halfway and show you the cut now let’s take a look at that cut real
close here as you can see we’ve got this nice clean cut right through there it’s a nice part about it only removes
one third the material of a conventional torch your conventional torch will never
be able to make that cut in the first place but here’s a nice clean cut in the back
side almost a hundred percent slag free now we’re going to cut some quarter inch
sheet played here and i’m going to use the over cutter this is good for quarter inch up to one
inch i’m going to use the copper on top number two on the bottom which is going
to be my heating tip oxygen only on the copper tip we’re going to fire it up go to that neutral flame and allow us to
give a nice clean cut on this plate and I’m actually going to bump the surface
with that copper pieces i’m cutting it and actually get it right along there this is good 40 sixteenth of an inch in
height so let’s go ahead and cut this yeah yeah 15 pounds of oxygen four pounds of
settling gives you a nice clean cut and now i’m going to give you just one more
cut on here and we’ll be all set let’s take a look at this cut now it
gives you a plasma like style cut its almost slag free hundred percent
penetration and that and that cut goes all the way through and gives you that
nice clean cut ok now we’re going to cut some half-inch
steel it’s a mild steel bar here and we’re going to use the over cutter again copper on top number two on the bottom
and we’re going to go ahead and lightly bump it straight up and down not like our convention are under cutter
cutter we pushed now we’re going to pull this kind of
cross piece so let’s get going again i’m going to make sure I’ve got that neutral
flame go from that feather right down to that
neutral and let’s go ahead and warm the steel up and then we’re going to go
ahead and let me bump this tip right across the surface we don’t worry about any puddle being on
the surface yeah we can shave a nice clean piece off our
conventional torch would melt that piece right away that’s great control that’s 15 pounds of
oxygen four pounds of settling let’s make another cut here let’s take a look at the back side
before we cut a nice zigzag there’s almost slag free in the back of
that cut whatever is on there actually bumps right off that’s 15 pounds of oxygen four pounds
of settling gives you a nice clean plasma like cut now we’re going to do
one more cut for you if I need the hand cut some gears on a
plate just grab your torch out and go ahead
and cut it whatever is on the backside bumps right off again there’s 15 and 4
we have a nice sharp edges on there again we’re using oxygen only that
allows us to get that nice clean cut ok now we’re going to show you how to
repair some cast iron a lot of your exhaust manifolds intake manifolds on
your older model a Model T’s all use a cast-iron to it good forecast scales we’re going to go
ahead and preheat the cast iron i’m going to use a number 2 tip on my
torch right here and this is going to be enough to give me a nice warm a nice big
flame to actually warm up this cast iron and then we’re going to turn it down and
make the world and i’m actually going to get the cast to start to flow and we
will blend that right in with a natural cast right now this is a foundry rod
this is actually just like the cast iron so i’ll have an annealing in fact it’s
actually going to soften the world and now i can well this write-up I can drill
it tap and I can machine it let’s go ahead and do a welder i’m going to just warm the area i’m
going to weld so let’s just knock the chill out of
this cast iron we use a little red borax flux for our cleaning of the casting it’s very porous and dirty so let’s go
ahead and get this warmed up it is actually going to turn red and get
nice and hot it’s gonna start to flow when the cast
itself starts to flow i’m going to add the filler rod into the
cast-iron so you can see it now it’s starting to turn to get red I’m just starting to flow right now what
I’m going to do is warm up my rod and get some flux on it so just take your ride later your puddle
area eat her up and just Dipper right down in the jar here now i’m going to bring that flux back
and melt it right in the area i’m going to weld now what’s going to happen this will
start to flow real nice you’ll start to see it yeah yeah yeah and again I’m dipping and dipping out
making a nice clean public sure it flows in a nice controlled flame plenty of
heat ok now we’re going to go ahead and just
post heated a little bit and we’ll take a look at it and all i want to do is I’m having a
nearly effect i’m actually softening this weld up we won’t have a problem of expansion or
contraction cutting and welding we can do both on this we do what they call a
melt cut you will cut your cast iron right with it all right we’re all set ok now we’re going to quarter-inch mild steel here and we’re
going to use a number 2 tip on our torch we’re still at four pounds of oxygen and
suddenly and let’s go ahead and get this weld it up we’re going to use some take
rod I got a sixteenth inch e70 – 6:00 – Grodd again available at your local well
II store and I’m gonna depend about you like I’m
TIG welding will get a nice puddle started yeah yeah yeah now we’re going to go ahead and do the steel i’m going to put the number
one tip on currently use the number to do the cast iron so let’s just go ahead and replace this
snug the tip on just take it off and I’ve got the number one has one square
ring on it I’m gonna put this one on right here and
again because it’s brass the brass with the machine finish I just need to Snug the tip on and
that’s all we’re ready to go so let’s go ahead and get this weld it
up back to my neutral flame for right now but in cat oven in the stainless
steel repair we’re actually going to carburized the
flame so I’m going to use a 308 big stainless steel rod and now i’m going to
go from my neutral flame which is right here and I’m actually going to add some
settling to it which is going to carburized the flame I want to go one and a half times this
length this allows the stainless steel to flow real clean so here we go start the water right up
was turned down actually a little bit too hot we can soften that up a little
bit all right this is also great for your
stainless steel exhaust work good penetration with that little bit of
carburetors flame allows that stainless steel to start to flow it will give you
a real nice bead when we’re done all right we’ve got someone 16 square up here along with a piece of
rectangular to be going well the two of them together I’m gonna do a little uh but joint and
i’m going to do a nice vertical joint here let’s go ahead and weld this up yeah ok now we’re show you our air settling tip this is
our low temperature tip runs on a settling owe me and you get about four
and 52 900 degrees would be your body letting and soldering might be your
copper to copper sweating 95 5 50 50 let’s put on a show you how it looks i’m
going to remove the shank out of art torch this is our tip shank and you’re
going to screw your arrow settling tip right into the same location so let’s get this one out again you’re
settling tip don’t forget running on a settling only
and we not want to add oxygen to it so we’re going to tighten this right up
in here just and again just snug them all right we’re going to add a settling
only this one we can take right down nice and
soft to be able to the panels on your car body letting a soldering connecting
your rough line to your A or B pillars back to your quarter panel and then we
can turn it right up and again it’s a settling only use the
atmosphere atmosphere air here ok now we’re going to show you a thin
cut on some sheet metal and actually do the repair on it this is an old model a grill cover it’s a 28 29 range I’m gonna actually
put a cut in here and i’m going to weld it back up again just to show you how
easy it is to cut and weld your thin applications in the older cars so let’s go ahead and put the undercut
Iran I’m going to a nice little soft flame in here and again we got the
oxygen on the bottom here is my oxygen trigger right here here’s my heating tip to get me started
and we’re going to go ahead and make a nice thin cut right in this metal so let’s get started here we’re going to
warm that steel right up now let’s well that right back up again
just to show you the ease of the torch I’m gonna go back to my straight welding
tip little filling rod we’re going to go ahead and use a steel
tube ride to fill it in i’m going to put one spot in the middle
because it still likes to move around a lot let’s come back and let’s just start
welding it up again I’m using a dip in depth motion just like I would do with a
TIG weld them from doing with the torch will have an annealing effect actually
soften the world now I can hammer this well doubt shape
it all right there we go then cut and
repaired already the hammered out grind it down
and painter ok now we’re going to show you how your
over and under cutter both accept the guide wheels we actually have a hole in here and same
thing in our over cutter we attach the wheels i’m going to show you how to do a nice
straight cut using our over cutter so here we go again i’m going to run the
same 15 and 4 on my oxygen and settling but we’re going to now use the guide
wheels make it easy for me to get a nice clean cut all right turn the heat up a little bit
i’m just going to knock the chill out of the plate makes it easier to go ahead
and cut it all right we’ll get a nice and hot you start to
flow and then we’re going to pull the trigger yeah ok now we’re going to show you cutting
aluminum if you have to get some non ferrous material you need to make a cut we do what they call a melt cut we’re
going to use our . 5 tip I’ve got some old 35 here we’re going to use a a
heating and chopping motion to actually cut through this aluminum so here we go now this is where I want to use a little
more of an oxidized flame I’m going to actually make that nice and
sharp it’ll be able to just heat that aluminum real quick and we’ll be the
pressure the torch like to chop right through it so let’s just knock the chill out of it there we go that’s good up to about an
eighth of an inch now you know what the torch can do click
the button and get yours today yeah yeah yeah yeah yeah yeah yeah yeah

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