HG70低合金高强钢的焊接冷裂敏感性及其焊接预热温度的拟定
Welding Cold Cracking Sensitivity of HG70 High-strength Low-alloy Steel and Its Welding Preheat-temperature Development
任芝兰 ， 邓 彬
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作者单位：湖南工学院 机械系，湖南 衡阳 421002
中文关键字：HG70钢；焊接性；冷裂纹敏感性
英文关键字：HG70 steel；weldability； cold crack sensitivity
中文摘要：综合运用碳当量法、焊接冷裂敏感指数法、插销试验和斜Y坡口试验，研究了HG70低合金高强钢的焊接冷裂敏感性。结果表明，10 mm厚的HG70钢板具有一定的淬硬倾向，焊前应进行低温预热，以提高其临界断裂应力，降低其冷裂敏感性；预热温度应控制在80～120℃。
英文摘要：Through calculations of carbon equivalents，cold crack sensitivity indexes, implant tests and Y-groove cracking tests, the cold crack sensitivity of HG70 high strength low alloy steel was investigated. The results show that HG70 steel plates with the thickness of 10mm has some hardenability and cold crack sensitivity， thus low-temperature preheating should be conduct before welding. Preheating can heighten the critical fracture stress and lower the sensitivity of the cold crack. The preheating temperature should be controlled between 80 and 120℃.