在ERW焊管机组生产中，带钢的硬弯大小直接影响焊管机组的正常运行及焊接钢管的质量。
During the production of ERW steel pipe mill, the size of steel of strip hard bent influences the running of pipe welder and the quality of the pipe.
我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。
We usually use elbow( bend, flange, tee, reducer) as a kind of pipe fitting.
现代的大小回转的弯都不是精确的圆弧形，而是像一个长的逗号的形状。
Modern GS and Slalom turns are not perfectly round. Instead, their shape resembles a long comma.
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