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This document specifies how a preliminary welding procedure specification is qualified by welding procedure tests according to the principles given in ISO 15607. This document applies to production welding, repair welding and build-up welding. This document defines the conditions for the execution of welding procedure qualification tests and the range of qualification for welding procedures for all practical welding operations within the qualification of this document. The primary purpose of welding procedure qualification is to demonstrate that the joining process proposed for construction is capable of producing welded joints having the required mechanical properties for the intended application. Two levels of welding procedure tests are given to permit application to a wide range of welded fabrications. They are designated by levels 1 and 2. For level 2 the extent of testing is greater, and the ranges of qualification are more restrictive than in level 1. Welding procedure qualification tests carried out to level 2 automatically qualify for level 1 requirements, but not vice-versa. When no level is specified in a contract or application standard, all the requirements of level 2 apply. This document applies to the arc and gas welding of steels in all product forms and the arc welding of nickel and nickel alloys in all product forms. Arc and gas welding are covered by the following processes in accordance with ISO 4063:2023. 111 — manual metal arc welding (metal-arc welding with covered electrode); 114 — self-shielded tubular-cored arc welding; 12 — submerged arc welding; 13 — gas-shielded metal arc welding; 14 — gas-shielded arc welding with non-consumable electrode; 15 — plasma arc welding; 311 — oxy-acetylene welding.