Seam normalizing systems

Advanced seam normalizing for advanced alloys and pipe

EFD Induction is a leader in modern, cost-cutting seam normalizing. Our solutions (which feature both NQN and NQT installations) can be found around the world, working for demanding pipe manufacturers to ensure that:

• The temperature at the inner wall is sufficient to achieve full homogenization.
• The heat pattern at the inner wall is wide enough to cover the full Heat Affected Zone.
• The temperature at the outer wall is kept to the minimum required for homogenization, thus avoiding the risk of coarse grain re-growth.

The seam normalizing systems available from EFD Induction include horizontal tracking, orbital tracking and travelling systems.

• With horizontal tracking systems the horizontal movement of the inductors lets them track on the top of the weld.
• With orbital systems, the orbital movement of the inductors ensures a constant distance between the weld and the inductor, independent of the twisting of the weld.
• Travelling systems feature a movable coil that in the event of a line stop can ‘track’ backwards to complete the normalizing process, thereby minimizing scrap.

A complete EFD Induction seam normalizing system typically includes a Sinac converter, workstations with induction coils, a flexible power cable, and a control system. All our seam normalizing systems include a ‘quick lift’ device to prevent open seams or deformed pipes from damaging the coils.

Complete control

EFD Induction seam normalizing systems are easy to control and specially designed to work with EFD Induction power sources, coils and handling mechanisms. Each control system can handle up to four induction heaters independently, and features temperature control of the seam heating as well as seam tracking control of the induction coils in manual and automatic mode. A recording unit records and stores important process parameters for all treated seams.