正面角焊缝接头的静力强度与尺寸设计研究

Research on static strength and weld sizing of transverse fillet welded joints

为提高现代薄板焊接结构中角焊缝的尺寸设计精度,首先分析了传统角焊缝剪切强度计算公式的不足,在对正面角焊缝受力状态进行详细分析的基础上,给出了正确反映焊缝内部应力状态的新的焊缝剪切强度计算公式。然后分别基于焊缝承载能力和等强度准则,推导了载荷已知和载荷未知条件下的正面角焊缝尺寸设计计算公式。最后结合试验数据对正面角焊缝接头与焊脚尺寸之间的关系进行了分析,结果表明合适的焊脚尺寸和焊接工艺可以使接头达到母材强度,而过大的焊脚尺寸和焊接热输入不但会引起严重的焊接变形,也会导致接头静力强度的降低。

In order to improve the weld sizing precision of modern thin-walled welded structures,disadvantages of conventional shear strength definition for fillet welds are analyzed.With detailed investigation on stress state of transverse fillet weld,a new equation which could depict correctly stress state in weld is proposed.Then,based on load capacity of weld and rule of equal strength respectively,weld sizing equation of transverse fillet weld is derived with known load and unknown load.At last,the relationship between strength of transverse welded joints and weld leg size is investigated according to test results.The results indicate that,strength of welded joints with appropriate weld size and welding procedure can be equal to that of base material,and oversized weld can not only lead excessive welded distortion,but also reduce joints＇ strength.