A WPS Is A Document That Describes How Welding Is To Be Carried Out in Production
A WPS Is A Document That Describes How Welding Is To Be Carried Out in Production
A WPS Is A Document That Describes How Welding Is To Be Carried Out in Production
production. They are recommended for all welding operations and many
application codes and standards make them mandatory
What information should they include?
Sufficient details to enable any competent person to apply the information and
produce a weld of acceptable quality. The amount of detail and level of controls
specified on a WPS is dependant on the application and criticality of the joint to be
welded.
For most applications the information required is generally similar to that recorded
on a Procedure Qualification Record (PQR) or Welding Procedure Approval
Record (WPAR), except that ranges are usually permitted on thicknesses,
diameters, welding current, materials, joint types etc.
If a WPS is used in conjunction with approved welding procedures then the ranges
stated should be in accordance with the approval ranges permitted by the welding
procedure.
However careful consideration should be given to the ranges specified to ensure
they are achievable, as the ranges given by welding procedure standards do not
always represent good welding practice. For example welding positions permitted
by the welding procedure standard may not be achievable or practical for certain
welding processes or consumables.
EN ISO 15609-1 (formally EN 288 Part 2) European Standard For Welding
Procedure Specifications
EN ISO 15609 Defines the contents of a Welding Procedure Specification in the
form of a list of information that should be recorded. For some applications it may
be necessary to supplement or reduce the list. For example only in the case of a
procedure requiring heat input control would there be a necessity to quote travel
speed or run-out length for manual processes.
ASME IX American Boiler and Pressure Vessel Code
QW 250 Lists the variables for each welding process, all the variables stated
should be addressed. The range permitted by the WPS is dictated by the PQR or
PQRs used to qualify it.
MMA
TIG
MIG
MAG
FCAW
SUB
ARC
Welding current
yes
yes
yes
yes
yes
yes
yes
yes
Arc voltage
If Auto
yes
If Used
If Used
yes
yes
yes
yes
yes
yes
yes
If Used
If Used
yes
Nozzle diameter
yes
yes
yes
yes
Sketches
Specification:- Example
Weld Procedure Number
Qualifying Welding Procedure (WPAR)
Manufacturer:
Location:
Joint Design
30 P1 TIG 01 Issue A
WP T17/A
Method Of
Preparation
and Cleaning:
Parent Metal
Specification:
Parent Metal
Thickness
Pipe Outside
Diameter
Welding Position:
Welding Progression:
Welding Sequences
Machine and
Degrease
Grade 304L Stainless
Steel
3 to 8mm Wall
25 to 100mm
All Positions
Upwards
Run
1
2 And
Subs
Size Of
Wire
Current Voltage
Type Of
Travel
Process Filler
Feed
A
V
Current/Polarity
Speed
Metal
Speed
TIG
TIG
1.2mm
1.6mm
70 - 90
80 - 140
N/A
DCDC-
N/A
Heat
Input
N/A
N/A
Production Sequence
BS 2901 Part 2 : 308S92
No