Process flow of steel pipe fittings manufacturing

For sheet metal, commonly used cutting methods include gas cutting, plasma cutting, and punch cutting. For bar materials, commonly used cutting methods include band sawing or bow sawing, punching and cutting. ② Forming (welding) is an indispensable process for the manufacturing of all pipe fittings. Due to the different forming processes of different products, a longer section is required, which will be separately described in Section 15.2.4. Here, a brief introduction is given to the heating and welding involved in some forming processes. a.  Heating is necessary for manufacturing pipe fittings using hot forming methods to meet the requirements of material deformation in the forming process, and the billet needs to be heated during forming. The heating temperature is usually determined based on the material and process requirements. When forming hot push elbows or hot bend pipes, medium frequency or high-frequency induction heating methods are usually used, and flame heating methods are also used. This heating method is a continuous heating process that is synchronized with the forming process of the elbow or bent pipe, and the pipe blank is heated during movement to complete the forming process. When forming hot pressed elbows, hot pressed tees, or forgings, methods such as reflection furnace heating, flame heating, induction heating, or electric furnace heating are usually used. This heating method involves first heating the tube blank to the desired temperature, and then pressing or forging it into shape in a mold. B There are two types of welded pipe fittings: one is made of welded pipes. For pipe fittings manufacturers, the forming process using welded pipes is basically the same as that using seamless pipes, and the forming process of pipe fittings does not include welding procedures; Another way is for the pipe fittings manufacturing plant to complete the welding process required for pipe fitting forming, such as the elbow formed by assembling and welding after pressing a single piece, the tee formed by welding a steel plate roll into a pipe blank and then pressing it, etc. The commonly used welding methods for pipe fittings include manual arc welding, gas shielded welding, and automatic welding. The manufacturing plant should prepare welding process specifications to guide welding work, and should conduct welding process evaluation according to the corresponding specifications to verify the correctness of the welding process specifications and evaluate the welding ability of the welders. Welders engaged in pipe welding operations must pass the examination of the quality and technical supervision department and obtain the corresponding qualification certificate before engaging in welding work of relevant steel grades (according to some industry regulations, welding pipe fittings used in certain industries must obtain the industry's prescribed welder examination and welding process evaluation, such as welding ship pipe fittings must obtain the corresponding classification society's welder examination and welding process evaluation).

试试AI翻译

笔记