For pipe fittings, one kind of pipe is made of welded pipe. For pipe fittings, the forming process of welded pipe is basically the same as that of seamless tube. It does not include welding procedure for the forming process of welded pipe parts; the other is the welding process which is required by the pipe parts manufacturing plant to complete the pipe forming, the welding flange is flange pipe. One of them is widely used and popularized in different fields and industries. 

The scope of application is different, the environment needs to be used is different, and it needs to be used according to certain conditions. The butt welding elbow is completed by two steel plates. Generally, the large diameter elbow is this process. The general caliber of over 600 is basically the butt welding elbow.