METHOD FOR FLASH BUTT WELDING SILICON STEEL SHEET

摘要

PURPOSE: A method for flash butt welding silicon steel sheet is provided in which the welding part of the silicon steel sheet has superior mechanical properties and is less defective by appropriately controlling flash butt welding conditions of the silicon steel sheet. CONSTITUTION: In a method for welding each of a preceding coil and a following coil of silicon steel sheet in a pickling and cold rolling line, the method for flash butt welding the silicon steel sheet comprises shearing the silicon steel sheet so that a distance(L) between the end part(6) of the preceding coil(4) and the front part(5) of the following coil(3) is maintained to 15 to 20 mm at the initial welding after fixing the end part of the preceding coil to a moving stand(2) and mounting the front part of the following coil on a fixing stand(1); welding both end parts of the preceding and following coils in the state that a certain distance(G) is maintained between the end part(6) of the preceding coil(4) and the front part(5) of the following coil(3) after moving the moving stand to the fixing stand side; flashing both end parts of the steel coil as advancing the moving stand side of the welded coil to the fixing stand side; upsetting both end parts of the silicon steel sheet by moving the moving stand to the fixing stand side as much as 4.5 to 5.5 mm; and removing the upsets by trimming upsets formed at the both end parts, wherein the flashing is preferably performed for 15 to 18 seconds.