CAJ | 학술논문

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,10mm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℃.
종합운용탄당량법、한접랭렬민감지수법、삽소시험화사Y파구시험,연구료HG70저합금고강강적한접랭렬민감성.결과표명,10mm후적HG70강판구유일정적쉬경경향,한전응진행저온예열,이제고기림계단렬응력,강저기랭렬민감성;예열온도응공제재80～120℃.
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℃.