Back to results
US 10,537,960 B2Granted
Weld between steel cord ends, method and apparatus to implement such weld
AssigneeNV Bekaert SA
InventorsTom Gommers, Geert Malfait
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNV Bekaert SA
InventorsTom Gommers, Geert Malfait
Estimating the term…
A welding apparatus for a controlled welding of steel cord ends. The welding apparatus allows for a controlled welding path from welding period over post-weld period to complete cool-down. In the welding apparatus a direct current source is controlled over time using a programmable controller. By sensing the voltage over the clamps of the welding apparatus and using this as a further input to the programmable controller, a constant power dissipation between the clamps can be achieved in the post-weld period. An associated method for making the weld where during the post-welding period the electric power dissipated between the clamps is held constant. The welds obtained by this procedure have a favourable metallographic structure in that the heat affected zone has more than 50% of pearlite and/or bainite over the total area of that zone.
A weld between two ends of steel cords, said steel cords comprising a plurality of filaments of drawn pearlitic carbon steel, each of said filaments having a cross sectional area of less than 0.2 mm2, wherein a metallographic cross section of the heat affected zone of said weld comprises pearlite and bainite metallographic structures in an amount that the area fraction occupied by pearlite and bainite is more than 50% of the total heat affected zone area.
A method for making a weld between steel cord ends, said steel cords comprising a plurality of filaments of drawn, pearlitic carbon steel, each of said filaments having a cross sectional area of less than 0.2 mm2 comprising the following steps:
Dependencies are inferred from the claim text.