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Specification and qualification of welding procedures for metallic materials. Welding procedure specification - Arc welding Ingestion-build-51215 Annex C (informative) Background toWhat is ISO 156091 Arc welding procedures for metallic materials about? ISO 15609 series covers specification and qualification of welding procedures for metallic materials. ISO 156091 is the first part of the muti series of documents that specifies requirements for the content of welding procedure specifications for arc welding processes. The variables listed in ISO 156091 are those influencing the quality of the welded joint. The main objective of