Specification and qualification of welding procedures for metallic materials. Welding procedure specification - Laser beam weldingBS EN ISO 15609 4: 2009 Specification and qualification of welding procedures for metallic materials. Welding procedure specification. Laser beam welding BS EN ISO 15609 4 specifies requirements for the content of the welding procedure specification (WPS) for laser beam welding processes, including overlay welding. It does not apply to other processes for cladding (e. g. thermal spraying). BS EN ISO 15609 4 is part of a series of standards, and

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