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Thursday, September 2, 2010

Welding Procedure Specification:- Example

Welding Procedure Specification:- Example

Weld Procedure Number 30 P1 TIG 01 Issue A
Qualifying Welding Procedure (WPAR) WP T17/A
 Manufacturer: National Fabs Ltd
25 Lane End
Birkenshaw
Leeds
 Location:  Workshop


 Welding Process: Manual TIG
 Joint Type: Single Sided Butt Weld
Method Of Preparation 
and Cleaning:
Machine and Degrease
Parent Metal Specification: Grade 304L Stainless Steel
Parent Metal Thickness  3 to 8mm Wall
Pipe Outside Diameter  25 to 100mm
Welding Position: All Positions 
Welding Progression: Upwards

 
Joint Design Welding Sequences

 
Run Process Size Of
Filler Metal
Current
A
Voltage
V
Type Of
Current/Polarity
Wire Feed
Speed
Travel
Speed
Heat Input
1
2 And Subs
TIG
TIG
1.2mm
1.6mm
70 - 90
80 - 140
N/A DC-
DC-
N/A N/A N/A

 
 Welding Consumables:-
 Type, Designation Trade Name:
 Any Special Baking or Drying:  Gas Flux:
 Gas Flow Rate - Shield:
                         - Backing:
 Tungsten Electrode Type/ Size:
 Details of Back Gouging/Backing:
 Preheat Temperature:
 Interpass temperature:
 Post Weld Heat Treatment
 Time, temperature, method:
 Heating and Cooling Rates*:

 BS 2901 Part 2 : 308S92
 No  Argon 99.99% Purity
 8 - 12 LPM
 5 LPM
 2% Thoriated 2.4mm Dia
 Gas Backing
 5°C Min
 200°C Max
 Not Required
Production Sequence
 
1. Clean weld and 25mm borders to bright metal using approved solvent.
2. Position items to be welded ensuring good fit up and apply purge
3. Tack weld parts together using TIG, tacks to at least 5mm min length
4. Deposit root run using 1.2mm dia. wire.
5. Inspect root run internally
6. Complete weld using 1.6mm dia wire using stringer beads as required.
7. 100% Visual inspection of completed weld

Revision History
Date Issue Changes Authorization
26/11/2000 A First Issue Jack Straw    Jack Straw

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