Forming Technology Of Circular Ring Shell Of Stainless Steel Seamed Pipe Elbow

Stainless Steel Weld Elbow the forming process is generally a circular ring shell that can be cut into 4 900 elbows or 6 600 elbows or elbows of other specifications. This process is suitable for manufacturing large elbows of any specification with a ratio of the elbow middle diameter to the elbow inner diameter greater than 1.5. It is currently an ideal method for manufacturing large elbows.

Below, let's talk about the forming process of stainless steel elbows in detail:

1. Cutting. Cutting is a process for completing the welding end, structural dimensions, and form and position tolerance processing of pipe fittings. For some pipe fittings, cutting also includes the processing of inner and outer diameters. Cutting is mainly completed by machine tools or general machine tools; for pipe fittings that are too large in size, when the current bed capacity cannot meet the processing requirements, other methods can also be used to complete the processing, such as the method of gas cutting and grinding for large-diameter elbows. The appearance and size inspection of pipe fittings are usually carried out after cutting.

2. Surface treatment. The surface treatment of pipe fittings is usually carried out by sandblasting, shot blasting, grinding, pickling and other methods to remove rust and scratches on the surface of the product, so that the product has a smooth surface and meets the requirements of subsequent processing and inspection. For pipe fittings that are surface treated by shot blasting, the surface hardness will increase slightly.

3. Welding. Pipe fittings with welds include two situations. One is pipe fittings made of welded pipes. For pipe fitting manufacturers, the forming process of welded pipes is basically the same as that of seamless pipes, and the pipe fitting forming process does not include welding procedures; the other is the welding process required for pipe fitting forming completed by the pipe fitting manufacturer, such as elbows formed by single-piece pressing and then assembly welding, and tees formed by welding steel plate rolls into pipe blanks and then pressing. Commonly used welding methods for pipe fittings include manual arc welding, gas shielded welding and automatic welding. The manufacturer should prepare welding process specifications to guide welding work, and should conduct welding process assessment according to the requirements of relevant specifications to verify the correctness of the welding process specifications and assess the welding ability of welders.