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This European Standard defines the rules to be observed to ensure the quality of aerospace structures in metallic materials by (solid reference number 521 and gas reference number 522 and diode laser Semi-conductor 523 according to EN ISO 4063) laser beam welding, implemented automatically, semi-automatically or manually. It is applicable without any restriction for the manufacturing of new parts or repair parts, these operations being under the responsibility of an approved design authority or repairer.