Stamping and welding elbow, that is, using the same material as the tube plate with stamping die stamping into a half ring elbow, and then two half ring elbow group welding forming.It has the advantages of simple cutting, high production efficiency and low cost.Specific operation methods are as follows:

1. For forging and pressing, the end or part of the pipe shall be extended by forging machine to reduce the outer diameter. Commonly used forging machines include rotary type, connecting rod type and roller type.

2. Stamping method: expand the tube end to the required size and shape with tapered core on the press.

3. Roller method, the core is placed in the tube, and the roller is used for edge processing.

4. Rolling method, generally do not need mandrel, suitable for thick wall tube inner round edge.

5. Zigzag forming method, there are three methods are more commonly used, one method is called extension method, another method is called stamping method, the third roller method, there are 3-4 rollers, two fixed rollers, an adjustment roller, adjust the fixed roller distance, the finished pipe is zigzag.

6. Bulging method, one is to place rubber in the tube, the top with a punch compression, so that the tube protruding shape;Another method is hydraulic forming, in which a liquid is filled in the middle of the tube, and the liquid pressure pushes the tube into the desired shape.

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