What are the welding methods for elbows?

　　Elbow include two cases, one is welded pipe welded pipe elbow, the elbow factory, the use of welded pipe forming process and the use of seamless pipe forming process is basically the same,A234 Wpb 90deg Butt Weld Sch40 Seamless Elbow forming The process does not include the welding process; the other is the elbow manufacturing plant to complete the welding of the welding process required for the welding process, such as single-chip suppression and then assembled welding forming elbow, with steel plate reel after welding into a tube And then to suppress the three links and so on. Elbow welding methods commonly used manual arc welding, gas welding and automatic welding and so on.