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导致脆性断裂的主要原因。本文给出了试验和分析结果，以研究断裂韧性和焊接缺陷尺寸的影响。研究结果如下：焊接缺陷对变形能力的影响较大。当量裂纹尺寸A作为焊接缺陷的评定方法，是评定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横隔板韧性对有缺陷梁柱焊接节点变形能力的影响。试验结果表明，梁翼缘屈服率对有缺陷梁柱焊接节点的变形能力有影响。梁翼缘的屈服率越低，梁柱节点的变形能力越高。关于膜片的韧性，热影响区局部的0℃夏比吸收能，即f…由于焊接的节拍影响，更多的裂纹起点上升。因此，在实际实验的范围内没有显著差异。对于缺陷尺寸的影响，当A小于或等于8 mm时，变形能力没有降低。相反，当A超过8 mm时，控球性能开始下降。如果用等效裂纹尺寸代替目前的超声标准，则约为A=4.47-7.04。因此，认为目前的超声标准是对安全侧进行评价的标准。其次，本研究通过拉伸试验来定量了解焊接缺陷，并将内部变形与边缘缺陷进行比较。结果表明，具有内部缺陷的焊接接头比具有边缘缺陷的焊接接头强度更高。至于长度，据了解，在内部缺陷的边缘缺陷处，它的变形量大约是内部缺陷的1.5倍到两倍。当缺陷高度不小于翼缘厚度的70%时，可将其识别为贯通厚度的焊缝缺陷。反之，当缺陷高度不超过法兰厚度的20%时，对变形能力的影响较小。最后，相信本研究可以给出有效和现实的尺寸限值。较少

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