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WPS(WELDING PROCEDUCE SPECIFICATION )

Present by : Nguyen Thi Hang

Time : 200 mins

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Training Objective

After finished lesson we can :1. Know WPS process flow

2. Understand what is WPS ?

3. Read and use WPS in Drawing

WPSPrepared by Nguyen Thi Hang Date 08.7.2008

Reviewed by Nguyen Thi Hang Date 08.7.2008

Approved by Kim Byoung IL Date 10.7.2008

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CONTENT1. WPS process flow2. WPS no character 3. Base metal ( P.no )4. Preheat5. PWHT6. Gas7. Technique8. Filler/erect. Charact9. Current/Polarity10. Welding Symbol

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1.WPS PROCESS FLOW

WPS Draft

Welding

WPSPQR

Approve

Test coupon

Test specimen prepare

Test

PQRNote

NDE

ASME ,AWS

Full Supervision & control W/D data

ResultBending ..

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1.1 WPS FORM

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2. WPS number

This is distinguished by welding process : - M (SMAW) : Shield Metal Arc Welding - F (FCAW) : Flux Core Arc Welding - G (GMAW) : Gas Metal Arc Welding - T (GTAW) : Gas Tungsten Arc Welding - A (SAW,SAC) : Submerged Arc Welding (Automative) - MA (welding process at the SMAW + SAW,SAC) : use 2 same time - TM ( GTAW + SMAW)

Base metal (P no) :- Example of joining 2 base metal (GROOVE or fillet , tag) 0303 : joining by “ P3” material on P3 material - Example of build up , buttering and cladding welding for 1 base metal 0343 : build up by “F43” inconnel electrodes on “P3” material

Application code :ASME I, ASME II, ASME VIII, ANSI/ASME B31.1, ASME IX, AWS D1.1 “A” : ASME (American Society Machanical Engineer )“ W ” : AWS ( American Welding Socieity )“ K ” : KEPIC ( Korea Electric Power Industry Code )`

It is the revised number

Ex ) - What is A- TM-4343-101 (GROOVE) ? - What is K-M-0308-102 (cladding) ?

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3. Base Metal▶Introduction for P-No briefly: P-No.1 Carbon steel (Minimum tensile strength is 40~75KSI) Ex: Pipe SA106A,B,C ;Tube SA178-A,C.SA210-A1.SA192.SA210-C ; Plate

SA36 .SA515-60,65,70.SA516-65,70 ;Forging SA105.SA668B,C P-No.2 Same P-No.1 (nearly not used.) P-No.3 Low alloy steel; below 0.75% Cr and below total 2% alloy (0.5 Mo ) SA 508 Cl.3a : 3.5Ni-1.75Cr-0.5Mo-V –Forging –Tensile min 90 ksi P-No.4 Low alloy steel; 0.75~2 % Cr and below total 2.75% alloy (1.25 Cr-

0.5 Mo) P-No.5 Alloy steel; below total 10% alloy P-No.6 High alloy steel; martensite stainless steel (13 Cr) P-No.7 High alloy steel; ferrite stainless steel (18 Cr) P-No.8 High alloy steel; austenite stainless steel (18Cr-8Ni) P-No.9 Ni alloy steel (max 5%) P-No.10 Other alloy steel ( contain 9% Ni) ,duplex Aus + Fer P-No.2X Al and Al alloy steel P-No.3X Cu and Cu alloy steel P-No.4X Ni and Ni alloy steel

Heat treatment Group no Tensile Strength

As rolled condition 1 Below 70 ksi

2 Over 70 ksi

Quenching & Tempered condition

3 Below 70 ksi

4 Over 70 ksi

▶Group –no:

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3.1 P.no (ASME code–section IX )

(Ferrus Metal)

(Non Ferrus Metal)

ASME

P-1 : C, C-Mn, C-Si, C-Mn-Si, …P-2 : Similar to P-1P-3 : C-1/2Mo, 1/2Cr-1/2Mo, 1Mn-1/2Mo, …P-4 : 1.25Cr-1/2Mo, 3/4Cr-1/2Ni-Cu, …P-5 : 2.25Cr-1Mo,3Cr-1Mo,5 9Cr-1Mo,∼ 3Cr-1Mo-1/4V-Ti-B,9Cr-1Mo-V-Cb-N, …P-6 : 12Cr, 13Cr, 15Cr, 13Cr-4Ni-MoP-7 : 12Cr-Al, 17Cr-Ti, 18Cr-2Mo-Ti, …P-8 : 18Cr-8Ni(304), 16Cr-12Ni-2Mo(316), 18Cr-10Ni-Ti or Cb(347), 23Cr-12Ni(309), 25Cr-20Ni(310), …P-9 : 2.25Ni, 3.5Ni, 4.5Ni, …P-10 : Mn-V, 26Cr-4Ni-Mo, 29Cr-4Mo, …P-11 : 9Ni, Mn-Mo-Ni, 1.25Cr-1/2Mo-Cu, …

P-21 to 25 : Aluminum & Al-base alloysP-31 to 35 : Copper & Cu-base alloysP-41 to 47 : Nickel & Ni-base alloysP-51 to 53 : Titanium & Ti-base alloysP-61 to 62 : Zircinium & Zr-base alloys

SA36,SA106,SA516,SA537Cl1

SA387Gr2,SA182F1,SA508Cl2SA387-11,SA335P11,SA423(5A)SA182F21,SA387-22(5B)SA336F91 (5C)SA542SA240-403,410SA240-405,409,410s,430SA240-304,316,321,347SA240-309,310

SA350LF5,SA352-LC3SA225C,SA612,SA790SA522TpII,SA517-B

SB209,SB234SB11,SB359SB160,SB690SB265,SB337SB493,SB523

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4. Preheat ▶ ASME I , Appendix -100 :P-No1, Gr.1,2,3 : 100 C, 0.3 %C & t >25 mm :80o C

P-No3, Gr.1,2,3 :100 C, min tensile strength 70 ksi ,

t>16 mm : 800 C

P-No3, Gr.1,2,3 : 100 C , min tensile strength 60 ksi or

t >13 mm : 1210 C

P-No. 5A ,5B , 5C : 1500 C , min tensile strength 60 ksi or

6% Cr and t >13 mm : 2040C

P-No. 6,Gr 1,2,3 : 2040 C

P-No.7 & No .8 : none

▶ Interpass Temp Max :- C/S & Low alloy steel : max 3500 C- Austenitic SUS : max 1770 C- High –Ni ,Cu- Alloy : max 1500 C

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5. PWHT

▶Purpose PWHT:

Hồi phục tính chất của vật liệu bị giảm độ mềm dẻo do thay đổi cấu tạo do ảnh hưởng nhiệt , đóng cứng lại và tồn dư ứng lực sau khi gia công uốn ,ép ,hàn ….nhằm loại bỏ hơi ẩm và loại bỏ ứng suất .

▶ ASME – section I : Power Boiler

1 hr/ in : minimum holding time at a normal Temperature for Weld thichness (mm)

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6. Gas

Flow rate of FCAW & TIG shielding gas generally :

- FCAW : CO2 gas => 15~25 L/MIN - GTAW : Ar gas => 8~17 L/MIN - GMAW: Ar + CO2 => 20~25 L/MIN (refer to WPS)

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7.Technique

Stick-out

Approximate distance (refer to WPS)-GMAW : short circuit

(6~13) ; spray/globular(12~25 )

-FCAW: 15~25 - SAW : 25~35mm -GTAW: N/A

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8. Filler/erect. Charact• Metal transfer mode GMAW/FCAW

• GTAW : EWth-2 ,OD 2.4 - EWth-2 :thorium 2% tungsten electrode (red)- EWP : pure tungsten electrode (green)- EWZr : Zicronium Tungsten electrode (brown)• Flux Type (SAW process) :- Neutral type :do not change the composition of

weld metal as produced by fusion together of base metal & electrode .They contain a little Mn , Si for multiple passes on thick plates .

- Active type :help eliminating porosity and weld cracking (Mn ,Si) it uses for single passes .

Pulsed arcGlobular arc Spray arcShort arc

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9. Current /Polarity

DCRP (DCEP) DCSP (DCEN)

• Welding process – Polarity :

- SAW : AC or DCRP

- GTAW : DCSP

- FCAW,GMAW : DCRP

- SMAW: AC or DCRP

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10. Welding symbol

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10.Welding Symbol

AWS A 2.4 -98 : Standard Symbol For Welding , Brazing

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10. Welding symbol

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10.Welding Symbol

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10.Welding Symbol

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END OF DOCUMENT