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T型管角焊缝在电站焊接工程中经常遇到,该类焊缝结构复杂、施焊困难、受力不均,往往是管道网络中的薄弱环节,因此应加强该类焊缝的检测.X射线透照是行之有效的检测手段,但由于焊缝结构复杂,透照技术难度较大,往往因探伤人员经验不足、透照方法不当或选择参数不合理,而得不到清晰的底片,需重复多次透照,这样既浪费工时和材料,又影响施工进度,有时底片显清晰,但未从有利于发现主要缺陷的方向透照,不能发现未焊透和未熔合等危险性缺陷,造成漏检或误判.本文以本单位自行加工并用于广东梅山糖厂自备电厂安装工程的几个三通T型管角接焊缝探伤为例,介绍一些经验体会.1 焊缝结构焊缝规格为(?)19mm×20mm+(?)133mm×10mm,属骑座式结构(图1),只在支管开坡口,用手工电弧焊.焊缝结构比一般对接焊缝复杂,其截面高度和宽度随相贯结点的位置不同而变化,且由于管
T-type fillet welds are often encountered in the welding of power plants. The structure of such welds is complex, and the welding is difficult and the force is not uniform, which is often the weak link in the pipeline network. Therefore, the testing of such welds should be strengthened. X-ray transillumination is an effective means of detection, but due to the complex structure of the weld, transillumination technology is more difficult, often due to lack of experience of inspectors, improper transillumination method or the choice of parameters is not reasonable, and can not get a clear film , It is necessary to repeat the transillumination multiple times. This will not only waste man-hours and materials, but also affect the progress of the construction. Sometimes the negative film is clear, but not from the direction conducive to the detection of major flaws, and can not find dangerous defects such as impermeable and unmelted , Resulting in missed inspection or misjudgment.In this paper, the unit self-processing and used in Guangdong Meishan Sugar Plant-owned power plant installation of several tees T-tube fillet weld inspection, for example, introduces some experience.1 Weld structure Welded seam size is (?) 19mm × 20mm + (?) 133mm × 10mm, which belongs to the structure of riding seat (Fig.1) The height and width of the section vary with the position of the intersecting nodes, and by Tube