Flange welding quality and preparation before welding

When the flange is connected, it is necessary to fix the two pipes, pipe fittings or equipment on a flange plate respectively, add flange gaskets between the two flange plates, and fasten them together with bolts to complete the connection. Some pipe fittings and equipment have their own flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand greater pressure. In the industrial pipeline, in the household, the pipeline diameter is small, and it is low pressure, and the flange connection is not visible. If it is in a boiler room or production site, flanged pipes and equipment are everywhere.
According to the connection method, the type of flange connection can be divided into: plate flat welding flange, flat welding flange with neck, butt welding flange with neck, socket welding flange, threaded flange, flange cover, with neck Butt weld ring loose flange, flat weld ring loose flange, ring groove face flange and flange cover, large diameter flat flange, large diameter high neck flange, eight-shaped blind plate, butt weld ring loose flange Wait.
Welding quality of flange
As an iron plate welded flange, many customers question whether the quality of iron plate welded flanges is better than forged welded flanges. In fact, the quality of iron plate welded flanges is the same as that of forged welded flanges, but where can the iron plate welded flanges be guaranteed? The material of the iron plate welded flanges is also not guaranteed, because in general During the process, the density of the iron plate welded flange is not a problem, but during the production process, the blank of the iron plate welded flange is rarely tested. Therefore, after the production is produced, it is not tested. The material of the iron plate welding flange cannot be used.
Pre-welding preparation of flange
1. Check and debug the equipment to ensure that the equipment is operating normally.

2. Prepare φ4.0J402 welding rod and dry it at 300℃-350℃ for one hour. Assembly: Assemble the cone and the large flange according to the drawings, and divide the large flange into 8 equal parts. Since the flange is thicker and the groove is larger, the segmented symmetrical, multi-layer welding is adopted.