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随着工业的迅速发展,很多重要结构都采用抗拉强度在140公斤/毫米~2以上的低合金超高强度钢制造焊接。在焊接低合金超高强度钢时,应用最普遍的是手工电弧焊。由于这种钢强度等级特别高,可焊性很差,很容易在焊缝热影响区产生低塑性的淬硬组织,随着碳当量的提高,焊件刚度越大,淬硬倾向越严重。又因为焊接过程中母材熔化到第一层焊缝金属中去的比例
With the rapid development of industry, many important structures adopt low-alloy ultra-high-strength steel with a tensile strength of more than 140 kg / mm2 for welding. In the welding of low-alloy ultra-high-strength steel, the most common application is manual arc welding. Due to the extremely high strength grade of this kind of steel, the weldability is very poor. It is easy to produce a low plasticity hardened structure in the heat affected zone of the weld. As the carbon equivalent increases, the rigidity of the weldment increases and the harden tendency tends to be more serious. And because the welding process of the base metal melts into the first layer of weld metal to the ratio