Flash butt joining member and flash butt welding method
AssigneePosco
InventorGyu-Yeol Bae
Life of this patent
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Abstract
A flash-butt joining member and welding method are provided. In the joining member and the welding method with excellent workability, the joining member having excellent workability includes a joint obtained by flash-butt welding a steel plate, and an average effective grain size difference between the coarse-grained heat-affected zone and a fine-grained heat-affected zone formed on either left or right side of the joint is within 10 μm.
Claims10
A joining member having excellent workability comprising:
- a joint obtained by flash-butt welding a steel plate,
- wherein the joint includes a coarse-grained heat-affected zone and a fine-grained heat-affected zone formed respectively while facing each other on left and right sides of a joint line, and
- an average effective grain size difference between the coarse-grained heat-affected zone and the fine-grained heat-affected zone formed either left or right side of the joint is within 10 μm.
A flash-butt welding method having excellent joint workability in the flash-butt welding method of flash/upset heating and post-heating at the time of flash-butt welding a steel plate using an electrode, the flash-butt welding method comprising:
- controlling a flash speed to 5% or more and 20% or less during pre-heating and flash heating of a surface to be joined of the steel plate, controlling a moving length between electrodes to 2.0 mm or more and 10.0 mm or less during upset heating, and then performing post-heat treatment to form a joint.
Dependencies are inferred from the claim text.