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在焊接强度极限≥150～200公斤/毫米~2 的超高强度钢,特别是40SiMnCrMoVRe 钢和32SiMnMoV 钢时,主要存在裂纹问题。裂纹是焊缝中最危险的一种缺陷,它不仅降低焊缝的强度,而且还会导致结构的低应力脆性破坏。从这种超高强度钢高压容器的零级和Ⅰ级焊缝的 X 光检查中发现,在2000余条焊缝中出现了447条裂纹,其总长度达10603毫米,占焊缝总长的0.25%。其中裂纹出现在锻件和板材连接接头中的有209条,长4293毫米,占裂纹总数的46.8%,占裂纹总长的41%;出现在环缝
In the case of ultra-high strength steels with weld strength limits ≥150 to 200 kg / mm2, in particular 40SiMnCrMoVRe and 32SiMnMoV steels, there are mainly problems with cracks. Crack is one of the most dangerous defects in the weld, which not only reduce the strength of the weld, but also lead to the low-stress brittle failure of the structure. From the X-ray inspection of zero-grade and grade-I welds of such ultra-high-strength steel high-pressure vessels, 447 cracks appeared in more than 2000 welds with a total length of 10,603 mm, accounting for 0.25 of the total weld length %. Among them, there are 209 cracks in the joint of forgings and plates, 4293 mm long, accounting for 46.8% of the total cracks and 41% of the total cracks;