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the welder Claudinei Lima Santos
is that will make this weld
Here we have the joint that will be welded
in the 5G welding position
without opening, and without root face
Stainless steels and especially stainless steels
duplex are very sensitive to oxidation
when they are warm, by temperature of weld bead
and therefore we will use
this diffuser "Gas Lens".
This diffuser "Gas lens" and this largest ceramic cup
better will distribute the shielding gas
in the weld pool still hot
We plugged the ends of the pipe
and put a purge gas, in this case
the argon
inside of the pipe to protect the side internal root
of oxidation by oxygen in the atmospheric air
As a rule of thumb, do three (3) small holes
about 2.5 mm or 3/32"
and check with the skin of part of back of our hand
If the gas is going softly in our skin
because if it has too much pressure.
The root will be concave internally and will be reproved.
This is the hardest time
The welder must understand well the pool fusion
to know whether the inside was molten,
if it does not penetrate into this initial time,
All internal weld bead will not have penetration.
Note here that the welder moves the cup
until the weld pool to penetrate in the root,
on the inside
note here that the welder moves only your hand
the wrist
it almost does not move, his hand,
his arm
and this will give a weld pool more concentrate
Note that the filler rod remains stopped in the groove
and the welder, moves forward with the weld pool
melting the filler rod, filling the groove
if, lack filler metal, the welder feeds the weld pool
pushing the filler rod
see now, with a clearer lens
See now, from another point
Note that at the end of the weld bead
The welder lifts the filler rod and keeps it under of the cup
to protect
the tip of the filler rod of contamination for the oxygen
of the atmospheric air.
see now, with a clearer lens
after we finish this side of the pipe
and before starting the weld on the other side
checked the temperature of interpass
which should be below 150ºC (302ºF)
Now let's finish the weld on the other side
Note that the welder supports
his hand
all the time in the pipe
this will facilitate the feeding of the filler rod
in the weld pool
the filler rod is all the time.
in contact with the weld pool
see now, without the dark lens of the helmet welding
Also note the positioning of the welder
The end of the weld bead is the time most important
of welding of pipes
Note that the welder when complete the final amendment, it lifts
the filler rod and keeps it under of the cup
to not be contaminated by oxygen atmospheric air
and also Hold down the trigger and the activates slope down
the amperage decreases gradually
and he continues walking, not to be failure to amendment
and nor that little hole at the end
Next he gets stopped, with the cup so
the shielding gas, set at 10 seconds, by the timer
of post flow
protect the end of the weld bead
the tip of the filler rod, and the tungsten electrode from contamination
by atmospheric air
see now, with a clearer lens, notice how the amperage
is decreasing
See now
without the dark lens, of helmet welding
See now, as was the weld bead externally
See now the inside
of root in the pipe
thank you for watching