DS EN 4678:2011 Aerospace Series - Weldments And Brazements For Aerospace Structures - Joints Of Metallic Materials By Laser Beam Welding - Quality Of Weldments Describes the rules to be observed to ensure the quality of aerospace structures in metallic materials by (solid code 521 and gas code 522 and diode laser Semi-conductor 523 according to EN ISO 4063:2