Regarding the fabrication of expansion bends
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Can 1D elbow welding be used directly for the fabrication of expansion elbows? We used to make them with long elbows.
A welded elbow is made by bending a pipe, and it can be welded; hence the name welded elbow. It does not mean that it has welds of its own. Since welded elbows are formed by pressing straight pipes into bends, seamless pipes are generally used to take into account structural stress considerations. Instead of welded pipes. The so-called seamless elbow is a cast part and cannot be welded
It’s chaotic :lol Seamless elbows can be welded; they are made by extruding seamless steel pipes. This is the same as what is meant by a welded elbow. A welded elbow simply refers to the fact that its connection method is welding, while a seamless elbow means that the material used for making the elbow itself is seamless