钢结构厚板对接焊缝低温冲击韧性试验研究.pdfVIP

7 5 Vol7 No5 2010 10 JOURNAL OF RA ILWAY SC IENCE AND ENG INEER ING Oct. 2010 1 1 1 1 2 , , , , ( 1. 清华大学土木工程安全与耐久教育部重点实验室, 北京 100084; 2. 清华大学建筑设计研究院, 北京 100084) : 目 , 国内建筑物在不断地超高层化以及超大型化,使得钢结构厚板的应用越来越广泛厚度增大导致焊缝焊接热 影响增大, 同时焊缝的缺陷敏感性也相对更加显著, 这些因素使得钢厚板焊缝韧性性能变差, 特别是在低温环境中更加明 显因此, 有必要研究钢厚板对接焊缝的低温冲击韧性对 150mm厚钢板对接焊缝进行了低温下的冲击韧性试验研究, 结 果显示焊缝区和热影响区的冲击韧性均随温度降低而降低, 而且热影响区的冲击韧性沿板厚度方向随表面到中心的位置 变化而降低, 这和母材的规律一致,但数值相对母材有所降低同时,利用 Boltzmann 函数对试验结果进行拟合分析, 得到 其韧脆转变温度及变化规律试验结果表明:钢结构特厚板对接焊缝有较明显的低温脆性特征,要引起足够重视 : 钢结构厚板;对接焊缝;热影响区; 低温; 冲击试验; 韧脆转变温度 : TU391 : A : 1672- 7029( 2010) 05- 0001- 05 Expermi ental st dy on the mi pact to ghness of thick plate b ttweld of steel str ct re at low temperat re 1 1 1 1 2 WANG uanqing , HU Zongwen, SH I ongjiu, ZHOU Hui, CHEN Hong ( 1. Key laboratory ofC ivil Engineering Safety and Durability ofChinaEducationM inistry, TsinghuaUniversity, Beijing 100084, China; 2. Architectural Design and R esearch Institute, T singhuaU niversity, Beijing 100084, China) Abs tract: W ithin buildingsbecom ing higher and larger continuously, steel thick plate isusedmore andmorew ide ly. Thickness increase leads to the increase of heat- affect, and the sensitivity ofweld defects is also relatively more significant, which causes theweld toughness performance of steel thick plate to getworse, especially in the low- temperature environment. Therefore, it is very necessary to study the mi pact toughness ofweld of steel thick plate. This paper carried out an expermi ental study on the mi pact