随着用于超音速飞行的飞机和导弹的出现，超高强度钢已成为基础结构材料。这些钢的制造需要同时开发焊接电极，以提供高效且兼容的焊接接头，以便在超高强度水平下使用。研制了一种用于AISI 4340钢超高强度热处理的低氢涂层焊条，该焊条具有令人满意的焊接特性，熔敷金属与AISI 4340钢超高强度相容。

Ultra high strength steels have come into contention as basic structural materials with the advent of aircraft and missiles destined for supersonic flight. Fabrication of these steels demanded the concurrent development of welding electrodes to provide efficient and compatible welded joints for service at the ultra high strength levels. A low hydrogen coated electrode for use with AISI 4340 steel heat treated to ultra high strength levels was developed which exhibited satisfactory welding characteristics and deposited weld metal compatible with AISI 4340 steel at the ultra high strength level.