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Welding Procedure Specification: Company Dodsal Pte Ltd. Approved by KBRT Signature Name Date

This welding procedure specification outlines the parameters for welding a single V-groove joint using gas tungsten arc welding and shielded metal arc welding. The joint will be welded in the uphill progression using an ER 308H filler metal for the root and hot passes and an E 308H-16 filler metal for the fill and cap passes. Interpass cleaning will be done by grinding or brushing with stainless steel wire brushes. Purging with argon gas will be maintained for the root and hot passes.

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130 views1 page

Welding Procedure Specification: Company Dodsal Pte Ltd. Approved by KBRT Signature Name Date

This welding procedure specification outlines the parameters for welding a single V-groove joint using gas tungsten arc welding and shielded metal arc welding. The joint will be welded in the uphill progression using an ER 308H filler metal for the root and hot passes and an E 308H-16 filler metal for the fill and cap passes. Interpass cleaning will be done by grinding or brushing with stainless steel wire brushes. Purging with argon gas will be maintained for the root and hot passes.

Uploaded by

S Gouda
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Dodsal Pte Ltd

Q-Chem Project, Ethylene Unit,


Doha, Qatar
Job No : 7979/G2/010 WELDING PROCEDURE SPECIFICATION
1 7979/WPS/PP/21 Rev.1 Date:08.01.01 Supporting PQR : DOD-SS-03 Dated : 23.05.98
2 Joint Design Single "V" Groove Joint Design
3 Backing None 37.5° ± 2.5°
4 Joint Prep. Machining and/or Grinding
5 Base Metal Spec. P8G1 T
6 Base Metal A312 TP 304H, A182 Gr. F304H,
A403 Gr.WP 304H 2-4mm 1.6mm +0.8mm
7 Pipe Dia Range >2" NB -0.0mm
8 Thickness Range 4.7 to 25.4mm (7mm GTAW, 18.4mm SMAW) Max offset - 1.6mm
9 Process GTAW SMAW
10 Type Manual Manual
11 F.No 6 5 1.6mm +0.8mm
12 A.No 8 8 37.5°±2.5° -0.0mm
13 S.F.A No. 5.9 5.4
14 AWS No. ER 308H E 308H-16 T 2-4mm
T
15 Flux N.A. N.A.
16 Insert N.A. N.A.
17 Position Of Groove All 18 Progression Uphill
19 Pre Heat Temp Range 10°C minimum 20 Interpass Temp. 170°C Max.
21 PWHT Temp. Range N.A. 22 Time Range N.A.
23 Shielding Gas & % Comp Argon 99.99% purity 24 Flow Rate Shielding 7-12 LPM (15-25 CFH)
Purging 10-15 LPM (21-31 CFH)
25 Purging Argon 99.99% purity (note.2) 26 Trailling Gas Cup Size N.A.
27 Tungsten Type : 2% Thoriated Size Dia 2.4mm 28 Orifice or Gas Cup Size 8-13mm
29 Wire Feed Speed N.A. 30 Mode Of Metal Transfer N.A.
31 Contact Tube to Work Distance N.A. 32 Oscillations N.A.
33 No. of Electrodes/ Filler Wire Single 34 String & Weave String & Weave
35 Number of Passes (per side) Multiple 36 Peening Not Allowed
37 Initial/ interpass cleaning Grinding and or Brushing 38 Method of Gouging NA
(note.1)
39 Pre Heat Maintenance N.A. 40
41 Weave width not to exceed 10mm for GTAW & 2.5 x corewire dia for SMAW
Pass Process Polarity Weld Filler Metal Amps Volts Speed Remarks
No. Direction AWS No. Dia mm/min
Root GTAW DCEN UPHILL ER 308H 2.4 80-120 8-12 35-60
Hot GTAW DCEN UPHILL ER 308H 2.4 90-140 8-12 50-110
2.5 /
Fill SMAW DCEP UPHILL E 308H-16 70-130 20-28 50-150
3.2

2.5 /
Cap SMAW DCEP UPHILL E 308H-16 70-130 20-28 50-150
3.2
Notes 1. Aluminium Oxide or Silicon Carbide Grindng wheels and S.S. wire brushes shall be used for interpass cleaning.
2,Purging to be maintained for Root and Hot pass.
3. Bohler , Austria make filler metal will be used.

COMPANY DODSAL Pte Ltd. APPROVED BY KBRT


SIGNATURE
NAME Shrikant Ajgaonkar
DATE 08.01.2001

Format No : DOD/Q-Chem/F082 Rev 0


c:\DIR00001\wps\pp21.xls

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