05.03.2013 Welding Procedure Specification - Wikipedia, the free encyclopedia

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procedure qualification.

Welding Procedure SpecificationFrom Wikipedia, the free encyclopedia

A Welding Procedure Specification (WPS) is a formal written documentdescribing welding procedures, which provides direction to the welder or weldingoperators for making sound and quality production welds as per the coderequirements . The purpose of the document is to guide welders to the acceptedprocedures so that repeatable and trusted welding techniques are used. A WPS isdeveloped for each material alloy and for each welding type used. Specific codesand/or engineering societies are often the driving force behind the development of acompany's WPS. A WPS is supported by a Procedure Qualification Record (PQRor WPQR). A PQR is a record of a test weld performed and tested (more rigorously)to ensure that the procedure will produce a good weld. Individual welders arecertified with a qualification test documented in a Welder Qualification Test Record(WQTR) that shows they have the understanding and demonstrated ability to workwithin the specified WPS.

Contents

1 Introduction2 References

3 See also

4 List of standards

Introduction

The following are definitions for WPS and PQR found in various codes and standards:

According to the American Welding Society (AWS), a WPS provides in detail the required welding variables for specificapplication to assure repeatability by properly trained welders. The AWS defines welding PQR as a record of welding variablesused to produce an acceptable test weldment and the results of tests conducted on the weldment to qualify a WeldingProcedure Specification.

The American Society of Mechanical Engineers (ASME) similarly defines a WPS as a written document that provides direction

to the welder or welding operator for making production welds in accordance with Code requirements.[1] ASME also defineswelding PQR as a record of variables recorded during the welding of the test coupon. The record also contains the test resultsof the tested specimens.

In Europe, the European Committee for Standardization (CEN) has adopted the ISO standards on welding procedurequalification (ISO 15607 to ISO 15614) and on welder qualification (ISO 9606), with the exception of qualification for steelwelders, where a new version of the old European EN 287-1 standard still applies. EN ISO 15607 defines a WPS as "Adocument that has been qualified by one of the methods described in clause 6 and provides the required variables of the weldingprocedure to ensure repeatability during production welding". The same standard defines a Welding Procedure QualificationRecord (WPQR) as "Record comprising all necessary data needed for qualification of a preliminary welding procedure

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05.03.2013 Welding Procedure Specification - Wikipedia, the free encyclopedia

en.wikipedia.org/wiki/Welding_Procedure_Specification 2/2

specification".[2] In addition to the standard WPS qualification procedure specified in ISO 15614, the ISO 156xx series ofstandards provides also for alternative WPS approval methods. These include: Tested welding consumables (ISO 15610),Previous welding experience (ISO 15611), Standard welding procedure (ISO 15612) and Preproduction welding test(ISO 15613).

In the oil and gas pipeline sector, the American Petroleum Institute API 1104 standard is used almost exclusively worldwide.

API 1104 accepts the definitions of the American Welding Society code AWS A3.0.[3]

References

1. ^ ASME Boiler and Pressure Vessel Code section IX: "Qualification Standard for welding and brazing procedures, welders,brazers and welding and brazing operators", Article II, Section QW-200.

2. ^ EN ISO 15607:2005 "Specification and qualification of welding procedures for metallic materials - General rules (ISO15607:2003)"

3. ^ API 1104: "Welding of pipelines and related facilities", parts 3 (Definition of Terms)

See also

Welding

Welder certificationList of welding codes

List of standards

ASME Boiler and Pressure Vessel Code section IX: "Qualification Standard for welding and brazing procedures, welders, brazersand welding and brazing operators"EN ISO 15607: "Specification and qualification of welding procedures for metallic materials - General rules (ISO 15607:2003)"EN ISO 15609: "Specification and qualification of welding procedures for metallic materials - Welding procedure specification(ISO 15609)", five parts.EN ISO 15614: "Specification and qualification of welding procedures for metallic materials - Welding procedure test (ISO15614)", 13 parts.EN ISO 9606: "Qualification test of welders — Fusion welding (ISO 9606)" four partsEN 287-1:2004 "Qualification test of welders — Fusion welding — Part 1: Steels"API 1104: "Welding of pipelines and related facilities", parts 5 (procedures) & 6 (welders)

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