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大跨距网架结构,设计新颖,具有使用安全、寿命长等特点。但对施工精度和焊接质量要求较高。为确保工程质量和人身安全,我们对大庆体育馆网架结构空心球节点的全部角焊缝,选用超声波探伤方法进行了检测。目前,对空心球节点管口角焊缝超声波探伤,还没有成熟的探伤方法和评定标准,因此,我们在接受该工程任务时,试做了多种探测方法的对比试验,认为角焊缝的超声波探伤是可行的。一、验收标准及试验方法(一)验收标准从该工程特征和各节点焊缝受力状态来看,线状缺陷是该工程质量的主要隐患,当角焊缝内有一定数量的点状缺陷存在时,还将起到应力平衡的作用,故允许适当气孔存在。根据上述分析,我们以受压容器二、三级标准为基础、结合实际情况,制定出该类焊缝的验收标准:
Large span grid structure, novel design, with the use of safety, long life and other characteristics. But the construction accuracy and welding quality requirements are higher. In order to ensure the project quality and personal safety, we conducted a test on all fillet welds of the hollow ball joints of the grid structure of Daqing Gymnasium by using ultrasonic flaw detection method. At present, there is no mature testing method and assessment standard for the ultrasonic inspection of the spout weld at the hollow ball joint. Therefore, when we accepted the task of the project, we tried the contrast test of various probing methods and concluded that the ultrasonic wave of the fillet weld Flaw detection is feasible. First, the acceptance criteria and test methods (A) acceptance criteria From the engineering characteristics and the joints of each node stress state, the linear defects is the main quality of the hidden dangers, when the fillet weld a certain number of punctate defects When present, will also play the role of stress balance, it allows the existence of appropriate pores. Based on the above analysis, we have two or three pressure vessel standards, based on the actual situation, develop the acceptance criteria for such welds: