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本文研讨了强度在70～100kgf/mm~2(100～143ksi)范围内的高强焊缝金属氢致裂纹(HIC)敏感性,提出防止裂纹的最低予热及层间温度。本研究是用几种类型的焊丝和高碱度烧结焊剂多道埋弧焊(SAW)进行的。焊剂选用不同焙烘温度以改变焊缝中扩散氢含量[H]_D,而不改变焊剂本身的性能。发现防止HIC的临界预热及层间温度与焊缝金属抗拉强度及用气相色谱法测定的扩散氢含量的对数值[H]_(D-GO)成正比,并可在给定的参数范围内可靠地予以评价。
In this paper, the HIC susceptibility of high strength weld metal in the range of 70 ~ 100kgf / mm ~ 2 (100 ~ 143ksi) was studied, and the minimum preheating and interlayer temperature for preventing cracks were proposed. This study was conducted using several types of wire and high basicity sintered flux multiple submerged arc welding (SAW). Flux selection of different baking temperature to change the diffusion of hydrogen content in the weld [H] _D, without changing the performance of the flux itself. It was found that the critical preheating and interpass temperatures to prevent HIC from being proportional to the tensile strength of the weld metal and to the logarithmic value [H] _ (D-GO) of the diffusible hydrogen content determined by gas chromatography, Within the scope of the reliable evaluation.