آسیاب غرفه - kalot.nl
اندونزیایی ERW آسیاب لوله لوازم جانبی سنگ شکن EFW pipe vs ERW pipeEFW pipe vs ERW pipe . Electric Fusion Welding(EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece ...