Effect of the deformation capacity of beam to column weld connection with defects using non metal weld tab

钢结构焊接接头的焊接缺陷是造成脆性断裂的主要原因。本文介绍了对断裂韧性和焊缝缺陷尺寸的影响进行试验和分析的结果。得到的结果如下所示。焊接缺陷对变形能力的影响要大得多。等效裂纹尺寸A作为焊接缺陷的评价方法，是评价梁柱节点变形能力的有效方法。其次，研究了梁翼缘屈服率和膜片韧性对含缺陷梁柱焊缝变形能力的影响。试验结果表明，带缺陷的梁柱焊缝的变形能力受梁缘屈服率的影响。梁翼缘屈服率越低，梁柱连接的变形能力越高。在膜片韧性方面，由于焊接温度的影响，膜片热影响区部分0℃Charpy吸收能升高。因此，在实际实验的范围内没有显著差异。关于缺陷尺寸的影响，当A小于等于8mm时，变形能力没有下降。相反，当A超过8mm时，占有性能开始下降。如果将现有的超声标准替换为等效裂纹尺寸，则得到a =4.47-7.04左右。因此，认为现有的超声标准对安全方面进行了评价。其次，本研究进行了拉伸试验，定量了解焊缝缺陷，并将内部缺陷与边缘缺陷进行比较。结果表明，含内部缺陷的焊缝比含边缘缺陷的焊缝强度大。至于长度，已经了解到它的变形量大约是原来的两倍，在1.5倍左右的边缘缺陷到两倍左右的长度处的内部缺陷。当缺陷高度不小于法兰厚度的70%时，判定为通厚焊接缺陷。相反，当缺陷高度不大于法兰厚度的20%时，对变形能力的影响较小。最后，相信本研究可以提出有效和现实的尺寸限制。少

The welding defect of the welding connection in steel structure causes the brittle fracture. This paper presents the results of tests and analysis conducted to investigate the influence of fracture toughness and weld defect size. The obtained finding is shown below.The welding defect have a much greater impact on deformation capacity. As evaluation methods of welding defect, equivalent clack size A is effective methods for evaluating deformation capacity of beam-to-column joints. Next, this study researched effect of the yield rate of beam flange and toughness of diaphragm on the deformation capacity of beam to column weld connection with defects. The experimental results show the deformation capacity of beam to column weld connection with defects is influenced by the yield rate of beam flange. The lower yield rate of the beam flange, the higher the deformation capacity of beam to column connection. About toughness of diaphragm, 0℃ Charpy absorption energy of part of HAZ that was the f … More racture starting point rose by the beat influence of the welding. Therefore, no remarkable difference in the range of the actual experiment. About effect of defect size, there is no decrease in the deformation capacity when A is less or equal 8mm. Oppositely, the possession performance begins to decrease when A is exceeded 8mm. If a present Ultrasonic standard is replaced with the equivalent crack size, it becomes about A=4.47-7.04. Therefore, it is thought that a present Ultrasonic standard evaluates the safety side.Next, this study experimented tensile test to quantitatively understand of weld defects and to compare of the internal deflects with the edge defects. As a result, weld joint with the internal defects is stronger than weld joint with the edge defects. As for length, it has been understood it has about twice the amount of the deformation in about 1.5times to twice length at the edge defects about internal defects. When defect height is no less than 70% of thickness of flange, it is identify with the through thickness weld defect. Oppositely, when defect height is no more than 20% of thickness of flange, it have low impact the deformation capacity.Finally, it is believed that this study could suggest the effective and realistic limits of size. Less