A deformation way from round welded pipe to square one is introduced.
介绍了一种由圆形焊管变方形焊管的变形方式。
What are the major challenges that the Italian welded pipe sector is facing?
是什么，意大利焊管行业面临的主要挑战是什么？
Tube is welded pipe or cap in the threads in pipe fittings to cover the wall.
管帽是焊接在管端或装在管端外螺纹上以盖堵管子的管件。
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