Little knowledge about steel elbows

simmered steel elbow weld locations

the inner arc is at 45 degrees.
the welded elbow is made of bent pipe and can be welded, so it is called a welded elbow. it does not mean that it has a weld itself. it is quite the opposite. since the welded elbow is made of straight pipes, it is considered that for structural stress problems, seamless pipes are generally used. instead of welded pipe. the so-called seamless elbow is a casting and cannot be welded.

what kind of pickling is commonly used for steel elbows?
the commonly used pickling of welded elbows is the same in the quality process. the acids used for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid, and mixed acids. the most commonly used are sulfuric acid and hydrochloric acid. the pickling processes mainly include immersion pickling, spray pickling, and acid paste rust removal. generally, the dipping and pickling method is used, and the spraying method can be used in mass production.