【摘要】 根据日本钢结构协会的调查,焊接裂纹的产生,以接头形式而言,T型接头占30％。十字型接头占54％。以裂纹产生部位而言,这两种接头型式的根部裂纹占80％。因此,如何评定T型接头中产生根部裂纹敏感性是钢材工艺焊接性评定的重要内容。目前,我国只有检验焊条用的T型接头焊接裂纹试验方法,而无检验钢材用的T型接头拘束裂纹试验方法。我们结台国外采用的T型可变拘束裂纹试验方法,做了五种T型接头拘束裂纹试样的试验;测定了每种试样的拘束度;确定了拘束度与冷裂纹率的关系。试验结果得到试样拘束度递减顺序基本与裂纹率递减顺序相吻合。本文建议:应根据实际结构的拘束度选择具有相应拘束度的T型接头裂纹试样进行抗裂性试验,同时选择施工的最低环境温度为试验温度,并按钢材特性选择合理的焊接工艺规范。更多还原

【Abstract】 The Tee-type cracking test methods currently employed in China are suitable for electrode examination only, but not for base metal according to the author’s point of view. After a brief survey on the methods specified by various authorities, this paper introduces five kinds of Tee-type restraint cracking test methods. Restraint severity of various kind of specimens was measured. The relationship between restraint severity and percentage of cold cracking was then determined. It is proposed that suitable restraint Tee-type cracking specimens are to be chosen according to restraint severity in practical structures, and that the lowest service temperature of the structure must be chosen as test temperature. Then, based on the characteristics of base metal, propet welding material and technology are to be selected in accordance.更多还原