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 have an annealing in fact it's actually going to soften the weld and
now i can well this write-up I can drill it tapping 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's 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 heater
up and just Dipper right down in the jar here now I'm gonna 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
and again I'm dipping and dipping out making a nice clean puncture 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 expansion or contraction cutting
and welding we can do both on this we do what they call a melt cut going to cut
your cast-iron right with it
alright we're all set
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