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.本文介绍了断裂韧性和焊接缺陷尺寸的影响进行调查的试验和分析的结果。得到的结果如下：焊接缺陷对变形能力的影响要大得多。作为焊接缺陷的评定方法，等效裂纹尺寸A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含缺陷梁柱焊接节点变形能力的影响。试验结果表明，带缺陷梁柱焊接节点的变形能力受梁翼缘屈服率的影响。梁翼缘的屈服率越低，梁柱节点的变形能力越高。在膜片韧性方面，热影响区部分区域的0℃夏比吸收功为最大， ...更多信息 断裂起点受焊接节拍的影响而升高。因此，在实际实验范围内无显著差异。在缺陷尺寸效应方面，当A ≤ 8 mm时，变形能力没有降低。但当A值超过8 mm时，占有性能开始下降。如果用等效裂纹尺寸代替现有的超声标准，则其变为约A=4.47-7.04。因此，认为目前的超声波标准评价的安全方面。接下来，本研究进行了拉伸试验，以定量地了解焊接缺陷，并比较内部挠度与边缘缺陷。结果表明，含内部缺陷的焊接接头强度高于含边缘缺陷的焊接接头。至于长度，已经理解的是，其在约1.5倍至两倍长度处具有约两倍的变形量，边缘缺陷约为内部缺陷。当缺陷高度大于或等于法兰厚度的70%时，可认定为全厚焊缝缺陷。当缺陷高度不超过翼缘厚度的20%时，对变形能力的影响较小。最后，本文的研究可以为实际应用中的缺陷尺寸限值提供参考。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