Flashbutt welding member with excellent processability and manufacturing method
AssigneePosco
InventorsGyu-Yeol Bae, Do-Kyeong Han
Life of this patent
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Abstract
A flashbutt joint member having excellent processability of a joint portion and a welding method thereof are provided. The present disclosure relates to a joint member having excellent processability and a manufacturing method thereof, and in a joint member having a joint portion obtained by flashbutt welding a butt joint portion of a steel sheet using an electrode, an average hardness difference between a coarse grain heat-affected zone and a fine grain heat-affected zone formed on any one of left and right sides of the joint portion, based on a joint line (joint interface) is within 50 in Vickers hardness.
Claims9
A joint member having excellent processibility, in a joint member having a joint portion obtained by flashbutt welding a butt joint portion of a steel sheet,
- wherein the joint portion includes a coarse grain heat-affected zone and a fine grain heat-affected zone respectively formed on left and right sides of the joint portion, opposing each other, based on a joint line (joint interface), and
- an average hardness difference between the coarse grain heat-affected zone and the fine grain heat-affected zone formed on one of the left and right sides of the joint portion is within 50 in Vickers hardness.
A flashbutt welding method having excellent processibility of a joint portion, in the flashbutt welding method, during flashbutt welding a joint target surface of a butt joint portion of a steel sheet using an electrode, upset heating is performed,
- the joint target surface of the steel sheet is pre-heated, flash heated, and then a movement length between the electrodes during upset heating is controlled to be 5.0 mm or more and less than 15.0 mm to form a joint portion.
Dependencies are inferred from the claim text.