Welcome to the X3M TIG channel.
Today I will show you, how I'm welding root and hot pass on 12" carbon pipe.
For this root pass, I'm running 120 Amps and 70S-6, 1/8 Tig filler wire.
The gap opening is 1/4 on this side
Another side we got a gap of 1/8
For this kind of gap, I will use the dipping technique
For the root part, I'm using cup size #8
I like to do a little modification to my cup
The manufactured shape of the cup,
is preventing me to manipulate with that cup as I would like to
So I will give you a little TIP on how I like to use it with little modification to it
Use Flap disc and round edges
A rounded edge of your cup will give you more control over your torch,
when you wiggle your cup on your root pass.
As you can see here,
you can slide that cup more easily inside that bevel.
Keep the filler wire on the upper edge of the bevel
and with your Tungsten manipulate that puddle from the top,
by moving it down to the bottom edge.
Very important to be consistent with your lay wire technique.
Keep the filler wire inside the puddle all the time.
For this part
I will run 140 Amps
With dipping technique
or keyhole-dip
dipping, you just push faster and then a short pause
equaling the same amount of filler.
Dipping will leave more distinct ripples in the weld.
With the lay wire technique, you will get a more uniform root appearance
Always clean after each pass
Root on Horizontal butt weld joint – is a little more difficult to master.
This is due to the tendency of molten metal
to flow to the lower side of the joint.
2nd pass 160 Amps
Hold the rod at the upper side of the bevel
The torch should move with a slight oscillation up and down
to distribute the heat equally to both sides of the joint.
Quick up and down steps
Will prevent excessive flow of the metal to the lower side of the joint.
so your second pass could be nice and shiny.
and ready for fill & cap
Hope you like this video
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