在过去几年中，由于火箭发动机壳体行业对超高强度重量比材料的要求，人们对超高强度钢板的焊接产生了兴趣。由于这个原因，几乎所有最近学习焊接这些钢的活动都与导弹工业密切相关；本报告主要总结了导弹行业使用这些钢的焊接经验。 讨论了该分类的候选母材合金（标称屈服强度大于200000 psi），并回顾了选择低合金马氏体类别的原因。在这种选择中，断裂韧性和耐多轴载荷的要求很重要。 最近开发的高镍马氏体时效钢在初步分析中有望更好地满足这些要求，本文对此进行了讨论。 详细介绍了钨极电弧焊这些钢的焊接工艺。在这些高强度水平下，断裂韧性充其量是有限的，必须尽一切努力使缺陷尺寸最小化。由于焊缝金属在不利于轧制的情况下，很可能会出现缺陷，因此不能过分鼓励关注焊接工艺细节。与用于低强度钢的程序相比，这些钢所需的热循环（预热和后热）是不寻常的，本文对此进行了讨论。 这些钢在发动机壳体加载系统中的力学行为已被证明难以通过常规焊缝拉伸试验进行预测。 因此，电机外壳要求引发了测试开发的浪潮。断裂韧性已经成为一个重要的考虑因素，并且已经开发了测试来测量这种性能。文中还讨论了双轴胀形试验和子柱试验。母材和焊接件的性能根据这些试验进行了介绍。

Interest in the welding of ultra-high strength steel sheet has been generated within the last several years by the requirement of the rocket motor case industry for a very high strength-to-weight material. For this reason virtually all recent activity in learning to weld these steels has been closely associated with the missile industry; this report is largely a summary of missile industry welding experience with these steels. The candidate base metal alloys for this classification (nominal yield strength greater than 200,000 psi) are discussed, and the reasons for the preference for the low alloy martensitic class are reviewed. The requirement for fracture toughness and resistance to multiaxial loading is important in this selection. A recently developed type, the high nickel maraging steels, shows promise in preliminary analysis of better meeting these requirements, and is discussed. The procedures for tungsten arc welding these steels are reviewed in some detail. At these high strength levels the fracture toughness is, at best, limited and every effort must be made to minimize the flaw size. Since the weld metal, without benefit of rolling, is a likely zone for flaws to occur, attention to weld process details cannot be too strongly encouraged. The thermal cycles required (preheat and post heat) for these steels are unusual, compared to those procedures used for lower strength steels, and are discussed. The mechanical behavior of these steels in a motor case loading system has proved difficult to predict by the conventional weld joint tensile tests. For this reason the motor case requirement has touched off a wave of testing developments. Fracture toughness has become an important consideration and tests have been developed to measure this property. Biaxial bulge tests and subsized cylinder tests are also discussed. Base metal and weldment capabilities are presented in terms of these tests.