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一、引言低合金高强度钢的发展和它们在低温条件下管线构件及近海结构方面的应用进一步要求改善焊态和应力消除状态下的焊缝金属缺口韧性。涉及到这一问题的一些文献一直是提交给IIW委员会XII分会XII-A的第5项目组,即“焊接细晶粒度钢和其它低温用钢的低合金焊丝”。XII-A-148-77(XII-E-4-78)文献总结出了为改善埋弧焊焊缝金属韧性,焊丝和(或)焊缝金属中微合金元素的最佳含量(表1)。很多文献都论及到添加少量Ti,B和(或Mo)的有利影响。这些元素的最佳含量
I. INTRODUCTION The development of low-alloy high-strength steels and their application to pipeline structures and offshore structures at low temperatures further require improved weld metal notch toughness in the as-welded and stress-relieved states. Some of the literature dealing with this issue has been Sub-Working Group 5, XII-A, IIW Commission XII, Welding Low Alloy Welding Wires for Fine Grained Steel and Other Low Temperature Steels. XII-A-148-77 (XII-E-4-78) The literature summarizes the best levels of microalloying elements in wire and / or weld metal to improve the toughness of submerged arc welding metals (Table 1) . Many documents deal with the beneficial effects of adding small amounts of Ti, B and (or Mo). The best content of these elements