MIL-W-41B, MILITARY SPECIFICATION: WELDING OF ARMOR, METAL-ARC, MANUAL, WITH AUSTENITIC ELECTRODES; FOR AIRCRAFT (26 MAY 1955) [SUPERSEDES JAN-W-41A] [S/S BY MIL-STD-1941] ., This specification covers the requirements for manual metal-arc welding with austenitic electrodes of built-up metal structures, hereinafter designated as weldments, constructed of face-hardened or homogeneous armor, or both, in thicknesses 1/8 to 1 1/8 inches, inclusive; and the attachment of brackets, clips, and other connecting members to armor by manual arc-welding.