Welcome to the X3M TIG channel.
Hello everyone
Today I will do a weld test
On A333 Gr.6, 3 Inch XXH wall pipe in 6G or 45-degree position.
ASTM A333 Grade 6 pipe is common to use the material for low-temperature services in above -45℃
Wall thickness is 15 mm
The bevel is around a 35-degree angle
Minimum 1/2 inch to be cleaned inside the pipe from the edge.
I like to use feather edge for TIG root.
Angle iron is the best tool to fit up your pipe and is easy to detect any hi-Lo if you got it.
The gap will be around, loose 1/8 up to 5/32 max.
I will put 3 tacks on 3,12, and 9 o'clock.
As long as we got enough room for 1/8 TIG rod should be fine
Usually, I like to have a 5/32 gap, but for a test, I prefer loose 1/8.
With Tungsten stick out, I usually go to the edge of the inside bevel
Now I will put the tack on 12 o'clock first
It will be a bridge tack
1/2 inch weld deposit on both sides
One side always pulls a little bit so you can make it even by tacking a wider side.
In this case, I will do the opposite as I like bigger gap on the bottom
Ok, now we got 3 tacks on 9,12, and 3 o'clock
Now, I will tack pipe at a 45-degree angle or 6G
Once you tack in that position it is permanent, with no moving, no rolling, or any adjustment.
Most of the people like to feed wire from the top,
I do that sometimes as well, but I also change technique, depending on the pipe diameter.
I use Freehand on the root pass, especially on the bottom part.
NOW
I will show you something different
The pipe is still at 45 degrees, but we change the tacks position.
I will do the hard side first, as I am right-handed.
I reposition tacks to be at 7, 10, and 2 o'clock
I will start this side first
Once I get to the first tack I will grind it out and continue to 12 o'clock
After that, I will move on to the left side
I will freehand my root, with constant feed wire from 6-5 section part
Pay attention to my TIG rod placement
At the bottom part, keep the rod halfway inside the root
Feeding rod from 8 o'clock
That way, you will not start too thick as you wanna keep the same profile all the way around
You can cut the rod in half, it helps to keep your rod steady, if it's too long it might wiggle on you.
I don't know if you can see it, but I'm feeding wire from 8 o'clock
Not from the top
At 8 o'clock I'll start pulling it out and keep the rod on the inside part of the bevel
As I'm progressing up to 9 o'clock I will switch to the dipping technique,
and will continue with that technique all the way up to 12 o'clock
I will cut this tack, and continue welding on the same side
Root look's good
Ok, now I will cut this tack and continue up to 12 o'clock
Grind your stop-start
Half of the root is done, and I am happy with it
Now, I will switch to the left or (easy side) if you are right-handed.
Walking the cup technique on the left side
TIG rod placement same as for the other side
Halfway in, feeding wire from 10 o'clock.
As you progress up
start slowly pulling your wire out and continue with the dipping sides technique
So far I am happy with the root
You can notice here on the left side, the root look's uneven compared to another side, but
It's a shadow from my camera angle, I will show you HERE
OK, I will grind stop-start here, and remove that tack.
I will weld all the way up to connect at the top,
OK let's go...
Pay attention to what technique I am using here and HOW.
Always pause on connection, with side to side tungsten motion, adding some wire
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When you tie in, go over 1/2 inch up to 1 inch and stop
The root is in,
Looks even all the way around, good enough for the test :)
Now, I'm going to do a hot pass
Run wire wheel before a hot pass
I'm using cup size #8 here and will switch later on to a bigger size
For hot pass size, 8 is good enough
I am working on the right side first.
Left side.
The hot pass is done.
In the second part video, I will be showing, fill to cap passes.
For the next passes, I will use a bigger cup, probably size #10.
and start filling up until flush, and capping probably two or three passes.
Hope you like this video or even better if you learn something new.
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