I.G. MIL-STD-22D_1991.03.21.pdf

This is a Military Standard (MIL-STD-22D) document titled "Welded Joint Design," dated 25 May 1979, with subsequent notices and amendments through 31 January 1984. The standard establishes design criteria and specifications for welded joints used in manual, semi-automatic, and automatic arc welding processes on metals and weldments for ship construction and machinery applications.

The standard covers structural and piping system weld joint designs identified through a four-character numbering system. Structural joints are designated with letters (B for butt, C for corner, E for edge, L for lap, T for tee, P for partial penetration) followed by numbers indicating the number of welded sides, configuration groove types (square, V-groove, U-groove, J-groove), and distinctive joint differences such as bevel angle and backing specifications. Piping system joints use designations prefixed with "P" for standard joints and "V" for pressure vessel joints, followed by numbers for individual joint variations. The document provides detailed technical drawings and specifications for over 70 joint configurations, including dimensional tolerances, welding positions, minimum throat thicknesses, root opening requirements, and backing ring specifications. Referenced standards include MIL-I-23413 (coiled filler material), MIL-STD-278 (fabrication and inspection), MIL-STD-1628 (fillet weld sizing), and NAVSEA publications for ship hull fabrication and inspection. The standard applies to government and commercial shipyards and requires authorized agent approval for equipment, materials, and procedures, with specific provisions for partial penetration tee joints and high-efficiency fillet-reinforced joints.