Arc welding using manual, semi-automatic or automatic processes; parent metals, welding consumables, preparation for welding; butt joints, branches, attachments, flanges; inspection, fault limitations; procedure and welder approval.Cross References:BS 638BS 1113BS 1560:Part 3:Section 3.1 BS 1640:Part 4BS 1821BS 2633BS 2640 BS 2901:Part 2BS 2901:Part 5BS 2910BS 2926BS 2971BS 3059:Part 2BS 3605:Part 1 BS 3605:Part 2BS 3971BS 4204BS 4870:Part 1BS 4871:Part 1BS EN 287-1BS EN 288-2BS EN 288-3BS EN 439