卓均之
    （武汉钢铁公司金属结构厂 430083）

[提要]  对冶金建筑总院1982年、1993年两次16Mn系列钢疲劳试验研究报告进行了对比分析，利用试验数据研究了原试验目的之外的课题：不同韧性钢材开孔应力集中、不同韧性焊材、K型对接焊缝焊趾角a、拉伸试件带肋断弧及弯曲试件K型对接焊缝对疲劳强度的影响，并对后三个课题提出了修正补充和建议，还对吊车梁焊透的T形焊缝焊角尺寸t_w / 2降至t_w / 4可行性试验结果进行了解释。本文可供《钢结构设计规范》（GBJ17-88）修订时参考。
[关键词]  钢材 焊材 K形焊缝 焊趾角 焊角尺寸 疲劳强度

Based on two research reports of fatigue test for 16Mn series steel 50mm in thickness, the effect on fatigue strength by stress concentration at holes of steel material with different tenacity, solder with different tenacity, the root angle of K-groove butt welded seam, the tensile sample with rib and break flash and the K butt weldedd seam for bending sample are studied. To the last three subjects, the author put forward amendments and proposals and explained the feasibility test results to the groove angle of T-welded seam of crane beam from t_w / 2 to t_w / 4.
Keywords: steel material; solder; K-welded seam; root; angle; welding; fatigue strength