TPT May 2021

T E CHNOLOG Y

The advantages of an EMMEDI seam annealer

THE EMMEDI seam annealing process is dedicated to the normalisation of the Heat Affected Zone (HAZ), as the welding bonding line is modified from a metallurgic point of view and it can generate failure in flattening and flaring tests. Both the American Petroleum Association (API) and the American Society for Testing and Materials (ASTM) specify that on certain grades of pipe, the weld seam needs to be processed in order to ensure that no untempered material remains. To remove the unwanted martensite, the weld must be reheated by seam normalising or seam tempering process. The distance of the inductors should be between 6-10mm from the HAZ and each heating unit is equipped with two water cooled rolls preventing dangerous contact with the tube. After the process the tube must be cooled down in free

atmosphere and then, when it gets at 370°C or lower, it can be cooled down by water shower. Inductors are linear

The seam annealing process

with a maximum width of 40mm and maximum length 1200mmbars of copper covered by magnetic flux concentrators cores to focus better on the magnetic field on the tube seam area. The main features of the seam annealing equipment designed by EMMEDI are a robust and very efficient IGBTs technology and inductors with the new flux-concentrators that offer great performance (process temperature 950 to 980 °C at 1 to 3kHz as typical working frequency). In addition, the manual or automatic seam tracking system keeps the inductor on track on the HAZ in tilted conditions (+/-15° with respect to the vertical axis) of the bonding line and thanks to the great smart process

control system it is possible to control both the equipment and process. The smart control desk is equipped with a touch screen industrial PC from where operators can download production data, store recipes and guarantee great production results. The seam annealing equipment is also furnished by pyrometers at each seam head, which are the process temperature/power guards of the Medium Frequency IGBT converters. The pyrometers are connected to converters thanks to the Proportional- Integral-Derivative (PID) controller.

EMMEDI www.saetemmedi.com

Top of the line cutting performance and automation level UNBEATABLE SPEED - EVEN WITH TOUGHEST JOBS To address the most stringent demands in terms of cutting output, automation and process reliability in the steel trade and production, BEHRINGER HBM series high-performance automatic bandsawing machines offer an impressive package of benefits. High-performance bandsaw HBM440A-PC-E Fully automatic, unmanned operation Dynamic deposit positions on the outfeed side Loading and unloading during the machine operation Highest cutting performance for solid materials and tubes

THE ORIGINAL

Outfeed-Sorting-Unit with bilateral pusher

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MAY 2021