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Welding quality and preparation before welding of flange, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-14
When the flange is connected, the two pipes, pipe fittings or equipment need to be fixed on a flange plate respectively. The connection is completed by fastening the two flange plates with flange pads and bolts. Some pipe fittings and equipment have their own flange plates, which are also flange connections. Flange connection is an important connection mode in pipeline construction. Flange connection is convenient to use and can withstand large pressure. In industrial pipelines, in the family, the diameter of the pipelines is small and low pressure, and flange connection cannot be seen. If in a boiler room or production site, flange pipes and equipment are everywhere. According to the connection mode, flange connection can be divided: plate flat welding flange, neck flat welding flange, neck butt welding flange, Socket welding flange, threaded Flange, flange cover, neck butt welding ring loose sleeve flange, flat welding ring loose sleeve flange, ring groove flange and flange cover, large diameter flat flange, large diameter high neck flange, eight-character blind plate, butt welding ring loose sleeve flange, etc. As for the iron plate welded flange, many customers question whether the quality of the iron plate welded flange is better than that of the forged welded flange. In fact, the quality of iron plate welded flange is the same as that of forged welded flange, but where can the iron plate welded flange not be guaranteed, and the material of iron plate welded flange is not guaranteed, because in the general process, the density of the iron plate welded flange is no problem, but in the process of production, the blank of the iron plate welded flange is rarely tested, so, after the production, the material of the iron plate welded flange that has not been tested cannot be guaranteed. Preparation of flange before welding 1. Check and debug the equipment to ensure its normal operation. 2. Prepare φ4. 0J402 electrode is good at 300 ℃-Dry at 350 ℃ for one hour. Assemble the vertebral body and the large flange together according to the drawing requirements, and then divide the large flange into 8 equal parts on average. Because the flange is thicker and the groove is larger, the segmented symmetry and multi-layer welding is adopted.
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