Though a change in the nonessential variable doesn’t require the requalification of the WPS, still it should be properly addressed in the welding procedure specification (WPS). Nonessential Variables (QG-105.4 & QW-251.3): Nonessential variables are those in which a change can be made without the requalification of the existing WPS since it is not considered to affect the mechanical properties of the joint. When procedure qualification does not require the addition of toughness testing, supplementary essential variables are not applicable. Hence supplementary essential variables become additional essential variables in situations where procedure qualification requires toughness testing. Supplementary Essential Variables (QG-105.3 & QW-401.1): A change in the supplementary essential variable will affect the toughness properties of the joint, heat-affected zone, or base material. Hence the WPS must be requalified if the essential variable is changed. Variables are of three types Įssential Variables (For WPS – QG-105.1 & QW-251.2): A change in the essential variable is considered to affect the mechanical properties (other than toughness) of the welded joint. These parameters have been termed as variables by ASME. A Welding Procedure Specification (for Welding) contains parameters related to the welding process along with the values or range (as applicable) required to produce a sound weld. Fusing Procedure Specification – FPS (for Fusing)Ĭontents of a Procedure specification: The procedure specification i.e.Brazing Procedure Specification – BPS (for Brazing).Welding Procedure Specification – WPS (for Welding).QG 101: Procedure specification: For each material joining process there should be a procedure specification, these procedure specifications are termed as We will discuss part QG of ASME Section IX in this article: Part QG gives general guidelines for the following These articles contain general references and guides that apply to welding procedure specification, Procedure qualification and welder performance qualifications such as positions, type and purpose of various mechanical tests, acceptance criteria, and the applicability of Section IX. Standard welding procedure specifications (SWPS) Performance qualifications for welders and welding operators Welding – General requirements for welding Part QW is further divided into five articles, these are Part QG (General requirements with a focus on welding) and Part QW (Requirements for welding). Since our focus is on welding henceforth we will discuss the two parts only, i.e. Note: Part QG General Requirements and Part QF Plastic Fusing were added in the 2013 Edition of ASME Section IX.
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ASME BPVC SECTION IX TRAINING CODE
ASME Boiler and Pressure Vessel Code (BPVC), Section IX contains qualification standard for the following