Connection method
Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, add flange pads 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.
1. According to the connection method, the flange connection type can be divided into: plate flat welding flange, neck flat welding flange, neck butt welding flange, socket welding flange, threaded flange, flange cover, neck pair Welding ring loose flange, flat welding ring loose flange, ring groove face flange and flange cover, large diameter flat flange, large diameter high neck flange, eight-shaped blind plate, butt welding ring loose flange, etc. .
Welding quality
As for the iron plate welding flange, many customers question whether the quality of the iron plate welding flange is better than the forged welding flange. In fact, the quality of iron plate welded flanges is the same as that of forged welded flanges, but where can iron plate welded flanges not be guaranteed? That is, the material of iron plate welded flanges is the least guaranteed, because In the general 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, it does not pass The material of the tested iron plate welding flange cannot be guaranteed.
Welding process
Required equipment
A set of manual electric welding equipment, a handle angle grinder, an electric hammer, and a plane ruler.
Preparation before welding
1. Check and debug the equipment to ensure the normal operation of the equipment; 2. Prepare the φ4.0J402 electrode to be dried at 300℃-350℃ for one hour.
Welding process
1. Assemble Assemble the cone and the orchid according to the drawings, and divide the orchid into 8 equal parts. 2. Welding Because the flange is thicker and the groove is larger, segmented symmetrical, multi-layer welding is adopted.
Weld quality
The weld strength is required to reach at least the strength of the base metal. The surface of the weld is flat and smooth, and there are no defects such as burn-through, pores, weld leakage, slag inclusion, undercut, and insufficient weld. The remaining height is less than 2mm.
Precautions
1. Be sure to use J506 electrode for manual surfacing and low current welding. Weld in strict accordance with the welding process. 2. After welding a position, use a level to check the deformation of the flange plane. 3. While welding, hammer the weld with an air hammer to eliminate stress.