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PQRs - Coggle Diagram
PQRs
formulate a welding procedure
Determine the method of approval.
Determine the most suitable essential variables which:
a Relate to production;
b Meet the range of approval.
Formulate weld procedure details, including all relevant information.
Assess the approval standard’s range to determine appropriate tolerances on procedure variables.
Conduct procedure trials to evaluate tolerances on variables.
Format of documentation: ensure all applicable information related to the welding procedure and subsequent approval is included on the documents.
Approve welding procedure(s) to the relevant standard.
From Steps 2 and 3, determine if approval is required (in this example, assume yes).
Carry out visual examination or subcontract to a test house.
Are there any special customer requirements?
Carry out NDT or subcontract to a test house.
Is the product manufactured to a Code of Practice?
Carry out destructive testing or subcontract to a test house.
Determine the class of work and investigate the product’s service condition.
Complete weld procedure approval record(s) (WPAR).
Approve welders to procedures.
Determine the number of WPSs necessary to meet production requirements.
Review production work and quality on a regular basis.
Complete all WPSs applying suitable tolerances for the range of approval.
Reflect on the cost!
Definitions BS EN ISO 15607
Welding procedure qualification record (WPQR)
Record comprising all data needed for qualification of a pWPS.
Welding procedure test
Making and testing a standardised test piece, as indicated in the pWPS, in order to qualify a welding procedure.
Work instruction
Simplified specification of the welding procedure, suitable for direct application in the workshop.
Pre-production welding test
Welding test having the same function as a welding procedure test, but based on a non-standard test piece, representative of the production conditions.
Welding procedure specification (WPS)
A document that has been qualified by one of the methods described in clause 6 and provides the required variables of the welding procedure to ensure repeatability during production welding.
Standard welding procedure specification
Welding procedure specification which has been qualified by a welding procedure test not related to the manufacturer and qualified by an examiner or examining body
Preliminary welding procedure specification (pWPS)
A document containing the required variables of the welding procedure which has to be qualified to one of the methods described.
Previous welding experience
When it can be shown by authenticated test data that the manufacturer's established production welding procedures are capable of consistently producing welds of acceptable quality over a period of time.
Welding process
For welding process (s) BS EN ISO 4063.
Tested welding consumable
Welding consumable or consumable combination tested according to appropriate standards for testing of welding consumables.
Welding procedure
Specified course of action to be followed in making a weld.
Welding consumable
Materials consumed in the making of a weld, including filler metals and auxiliary materials.
Non-essential variable
Welding condition addressed in the WPS but not requiring qualification.
Essential variable
Welding condition that requires qualification.
Range of qualification
Extent of qualification for an essential welding variable.
Homogeneous joint
Welded joint in which the weld metal and parent material have no significant differences in mechanical properties and/or chemical composition.
Heterogeneous joint
Welded joint in which the weld metal and parent material have significant differences in mechanical properties and/or chemical composition.
Dissimilar material joint
Welded joint in which the parent materials have significant differences in mechanical properties and/or chemical composition.
Welding co-ordination personnel
Personnel who have responsibilities in the manufacturing operation for welding and welding related activities whose competence and knowledge has been demonstrated by eg training, education and/or relevant manufacturing experience.