Sets out recommendations for the radiographic examination of fusion welded butt joints in light alloys in thicknesses up to and including 2 inch (50 mm) for plates or large diameter pipes or vessels, and in thicknesses up to and including 2 inch (50 mm) for pipes using the single-wall technique, or 1 inch (25 mm) using the double-wall technique. The recommendations are based primarily on radiographic techniques which have been used successfully in industry for the examination of welds. No attempt is made to define which technique is to be used for any particular weld, because this is a matter for agreement between the contracting parties. It is pointed out however, that where applicable, Statutory Regulations must be met.