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PROCEDURE QUALIFICATION RECORDS (PQR) Page : 1 of 2 Applicable code : AWS D1.1-2010 POST WELD HEAT TREATMENT Company name: POSCO E&C VIET NAM Temperature N/A PQR No. PQ-FC-2G-08 Date 26 Feb. 2015 Time Range N/A Revisions None Other N/A Welding Process(es) FCAW Type(s): Manual Machine ELECTRICAL CHARACTERISTICS Semi-automatic Automatic WPS No.: WP-FC-2G-08 Transfer Mode (GMAW): ort -Circuitin Globular Spray Pulsed JOINTS Current : AC DCEP DCEN Joint design: Single V joint Other : N/A Backing: Yes No Tungsten electrode (GTAW): Backing Material (Type) Base metal Size : N/A Other Root gap : Root Face : Type: N/A GrooveAngle : Back gouging : Yes No SHIELDING Gouging method : N/A Flux : None BASE METALS Electrode-Flux(class): None Material Specification : ASTM 515 Gas (FCAW) CO2 Type or grade: 60 Percent Composition: 99.8% Thickness: Groove: 8mm (Mixture) Fillet : N/A Flow rate: 15 l/min. Pipe Diameter: plate TECHNIQUE Ceq of base metal: N/A String or Weave Bead Weave FILLER METALS Orifice or Gas Cup Size 19mm Interpass Cleaning Brushing & grinding SFA No. AWS A5.1 (Brushing, Grinding, etc. AWS Class E71T-1C Elect/Filler Dia.: Þ1.2mm Method of Back Gouging Arc Gouging Electrode/Filler trade name: ?? Oscillation N/A Electrode-Flux (class): none Contact Tube Flux -trade name none to Work Distance Non-Consumable Elect. none Multiple or Single Multiple Non-Consumable Elect. Dia. none Pass (per Side) Manufacturer: Hyundai Welding Co. (KOREA) Multiple or Single Multiple Electrodes POSITION JOINT SKETCH Position of Groove 2G Position of Fillet N/A Welding Progression: N/A Other N/A PREHEAT Preheat Temperature Interpass Temperature WELDING PARAMETERS (Table #1) Weld Layer.Pass Process Elect/Filler Current T.Speed H. Input AWS Class Dia (mm) Polarity Amp. (Kj/mm) Root 1 FCAW E71T-1C Þ1.2 DCEP 140 22 400.0 - 28 - Fill 2 FCAW E71T-1C Þ1.2 DCEP 170 25 436.4 - 42 - Cap 3.1 FCAW E71T-1C Þ1.2 DCEP 180 25 452.8 - 28 - Cap 3 FCAW E71T-1C Þ1.2 DCEP 180 25 558.1 - 28 - Cap 3.3 FCAW E71T-1C Þ1.2 DCEP 180 25 545.5 - 28 - Back Gouging Cap 1 FCAW E71T-1C Þ1.2 DCEP 180 24 369.2 - 28 - Cap 1 FCAW E71T-1C Þ1.2 DCEP 180 25 533.3 - 28 - Prepared by : Reviewed by : Approved by: Name: Name: Name: Signature: Signature: Signature: Date: Date: Date: 60 0 28 0 C (ambient) Min. (28 0 C), Max. (105 0 C) Voltage (V) Interpass Temp. Width (mm) Depth (mm) (mm/ min.) ( 0 C)

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1PROCEDURE QUALIFICATION RECORDS (PQR)Page : 1 of 2Applicable code :AWS D1.1-2010POST WELD HEAT TREATMENTCompany name:POSCO E&C VIET NAMTemperatureN/APQR No.PQ-FC-2G-08Date26 Feb. 2015Time RangeN/ARevisionsNoneOtherN/AWelding Process(es)FCAWType(s):ManualMachineELECTRICAL CHARACTERISTICSSemi-automaticAutomaticWPS No.:WP-FC-2G-08Transfer Mode (GMAW):Short -CircuitingGlobularSprayPulsedJOINTSCurrent :ACDCEPDCENJoint design:Single V jointOther :N/ABacking:YesNoTungsten electrode (GTAW):Backing Material (Type)Base metalSize :N/AOtherRoot gap :Root Face :Type:N/AGrooveAngle :600Back gouging :YesNoSHIELDINGGouging method :N/AFlux :NoneBASE METALSElectrode-Flux(class):NoneMaterial Specification :ASTM 515Gas (FCAW) :CO2Type or grade:60Percent Composition:99.8%Thickness:Groove:8mm(Mixture)Fillet :N/AFlow rate:15 l/min.Pipe Diameter:plateTECHNIQUECeq of base metal:N/AString or Weave BeadWeaveFILLER METALSOrifice or Gas Cup Size19mmInterpass CleaningBrushing & grindingSFA No.AWS A5.1(Brushing, Grinding, etc.)AWS ClassE71T-1CElect/Filler Dia.:1.2mmMethod of Back GougingArc GougingElectrode/Filler trade name:??OscillationN/AElectrode-Flux (class):noneContact TubeFlux -trade namenoneto Work DistanceNon-Consumable Elect.noneMultiple or SingleMultipleNon-Consumable Elect. Dia.nonePass (per Side)Manufacturer:Hyundai Welding Co. (KOREA)Multiple or SingleMultipleElectrodesPOSITIONJOINT SKETCHPosition of Groove2GPosition of FilletN/AWelding Progression:N/AOtherN/APREHEATPreheat Temperature280C (ambient)Interpass TemperatureMin. (280C), Max. (1050C)WELDING PARAMETERS (Table #1)Weld Layer.PassProcessElect/FillerCurrentVoltage (V)T.SpeedH. InputInterpass Temp.Width (mm)Depth (mm)AWS ClassDia (mm)PolarityAmp.(mm/min.)(Kj/mm)(0C)Root1FCAWE71T-1C1.2DCEP14022400.0-28-60Fill2FCAWE71T-1C1.2DCEP17025436.4-42-5524.2039.6Cap3.1FCAWE71T-1C1.2DCEP18025452.8-28-53Cap3.2FCAWE71T-1C1.2DCEP18025558.1-28-43Cap3.3FCAWE71T-1C1.2DCEP18025545.5-28-44Back GougingCap1.1FCAWE71T-1C1.2DCEP18024369.2-28-65Cap1.2FCAWE71T-1C1.2DCEP18025533.3-28-45Prepared by :Reviewed by :Approved by:Name:Name:Name:Signature:Signature:Signature:Date:Date:Date:

2PROCEDURE QUALIFICATION RECORD (PQR) (PQR No.: PQ-FC-2G-08 )Page : 2 of 2Applicable code :AWS D1.1 - 2010TENSILE TEST (Test report No: KT3-00738CK5/1)Specimen No.Width(mm)Thickness(mm)Area(mm2)Ultimate Total Load(kN)Ultimate unit stress, MpaCharacter of Failure and LocationTS120.007.99159.8074.9469Base metalTS220.008.02160.4077.1481Base metalGUIDE BEND TEST (Test report No: KT3-00738CK5/1)Specimen No.Type of bendResultRemarkRB1Root bendPassRB2Root bendPassFB1Face bendPassFB2Face bendPassVISUAL INSPECTIONRADIOGRAPHIC-ULTRASONIC EXAMINATIONAppearance:AcceptanceRT report No.:GTC/POS/PQR/RT-005Result:AcceptanceUndercut:AcceptanceUT report No.:N/AResult:N/APiping porosity:NoneConvexity:AcceptanceFILLET WELD TEST RESULTTest date:18-Dec-14Minimum size multiple passMinimum size single passWitnessed by:Luu Tri PhuMacroetchMacroetchOther test:As below1.N/A1.N/AMACROETCH TEST2.N/A2.N/ATest report No.:N/AResult.:N/A3.N/A3.N/AHARDNESS TESTAll -weld - metal tension test:Test report No.:N/ATensile strength, Mpa:N/ATest LocationAcceptance criteria (Vicker)ResultYield point/strength, Mpa:N/AWeld metalN/AN/AElongation in 2 in., %:N/AHAZN/AN/ALaboratory test No.:N/ABase metalN/AN/AIMPACT TESTTest report No.:N/ATest locationTemp. (0C)Acceptance criteria for weld metal & HAZTest valueTest resultMinimum average (J)Minimum Single (J)average (J)Minimum Single (J)N/AN/AN/AN/AN/AN/AN/A56585857.3333333333Welder Name:HOANG VAN LUONGClock No.:N/AStamp No.:W-POS-210Tests conducted by:QUATEST 3LaboraryTest number :PQ-FC-2G-08Per:Luu Tri PhuWe, the undersigned, certify that the statements in this record are correct and that the test welds were prepared, welded, and tested in conformancewith the requirements of clause 4 of AWS D1.1/D1.1M, (2010)Structural Welding Code-Steel.yearSigned:POSCO E &C VIET NAM(Manufacturer or contractor)By:Title:Date:


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