Remember that one of the main goals for the hot pass is to not screw up the root.
IF you go too slow or too hot or both, you can melt thru and sometimes that results in something called "suck back" which usually fails you on a 6g test.
Move fairly quickly across the middle and step on out.
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WELD PROCESS = TIG, GTAW, GAS TUNGSTEN ARC WELDING,
METAL TYPE = carbon steel PIPE
THICKNESS = 6 inch schedule 80 pipe wall thickness .430"
WELD TYPE = groove
JOINT TYPE = BUTT WELD OPEN ROOT WITH 1/8” GAP AND ZERO LAND
LAYWIRE TECHNIQUE USING FORWARD AND BACK MOTION
AMPERAGE = 130 AMPS
TUNGSTEN = 2% LANTHANATED, 3/32"
FILLER WIRE = 1/8” ER70S2
POLARITY = DCEN
GAS FLOW = 20 CFH argon
CUP SIZE = 8
PRE FLOW = MANUAL
POST FLOW = 10
ADDITIONAL SETTINGS =
TIPS: EXTEND ELECTRODE ENOUGH TO GET A DECENT ANGLE SO THAT WALKING THE CUP OR FREEHAND WELDING BOTH WORK WELL
Aim for an arc length that is equal or less than the diameter of your tungsten electrode.
Torch angle can be forgiving provided your arc length is tight.Keep the hot tip of the filler wire shielded by the argon envelope from the tig cup
Snip oxidized tip of filler metal before a restart