Induction heating of weld seams
Longitudinally welded tubes with particular alloy ratios and/or for particular purposes undergo an additional heat treatment. The coarse-grained microstructure in the weld seam can be normalised by partial heat treatment. For this, the tube is fed continuously beneath the inductors and heated to the required temperature.
Weld seam annealing machines equipped according to requirements with different numbers of linear inductors and power ratings, depending on the wall thickness, material and production rate, are used for this.
SHORTEST POSSIBLE HEATING TIMES
EASILY CONTROLLED PROCESSES
Individually adaptable dimensioning
The modular structure of EloSeam allows the annealing zone to be exactly aligned and dimensioned to the requirements of the tube plant, which ensures thorough heating.
Boosting inductor efficiency
Ferrite sheets (concentrator sheets) are incorporated in the water-cooled inductors. As a result, the power input is concentrated in the seam area and the efficacy or efficiency of the inductors rises. The power input is regulated to avoid surface overheating.
Automatic inductor position adjustment
A pilot line is applied to mark the exact position of the weld seam. Tube drift is detected by a camera and the EloSeam control system automatically adjusts the inductor position, which ensures a constantly precise annealing process.