WELDING PROCEDURE SPECIFICATION Summary: GTAW / 6G / A 312 / φ ≥ 25.4mm OD
Applicable Codes: ASME SEC IX 2010
DOC. REF WPS NO: Rev:00 Page No.:
POSITIONS(QW-405): Position of Groove 6G & ALL Welding Progression UPHIL Position of Fillet All Others
POST WELD HEAT TREATMENT(QW-407): Heating Rate NA Holding Temperature Range NA Holding Time Range NA Cooling Rate NA Others -
PREHEAT(QW-406):
GAS(QW-408):
Preheat Temperature(Min.) -100 C Min Interpass Temperature(Max.) Preheat Maintenance Yes
Gas(es) ARGON
Shielding Trailing Backing Gas : Single
1500C Max
Percent composition %Comp. of Flow Rate 99.995 % 8 to 15 LPM
NA
NA
NA
ARGON
99.995 %
8 to 15 LPM
75 - 120 Amps
Voltage Range:
09 - 15 Volts
ELECTRICAL CHARACTERISTICS(QW-409): Current AC or DC: DC
Polarity :
Tungeston Electrode Size and Type Mode of Metal transfer for GMAW Electrode/Wire feed speed range -
Straight for GTAW (NegativeDCEN) 2.4 mm and 2% Thoriated NA NA
Ampere Range:
TECHNIQUE(QW-410): String / Weaving shall not exceed 2.5 times of electrode dia. Stringe or Weave Bead Orifice or Gas Cup Size 5 -8 mm OD Initial and Interpass Cleaning(Brushing,Grinding,etc.) Grinding & Brushing (Use Stainless steel special tools) Method of Back Gouging NA Oscillation NA Contact Tube to Work Distance NA Multiple or Single Pass(per side): Multiple Multiple or Single Electrode Single Travel Speed Range 0.8 - 1.5 mm/sec Peening NA Closed to out chamber : NA Use of thermal Process : NIL Others Filler Metal Current Weld Voltage Travel Speed Weld Layer Diameter Type & Ampere Process Range(V) Range Class mm Polarity Range(A) Root+ Hot