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AssigneeKawasaki Steel Corporation
InventorsMamoru Fujii, Kazuo Noda, Shoji Nagasaka, Hiroshi Tajika, Koji Ono
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A method, for butt-welding steel strips using a laser beam are disclosed, in which opposite ends of preceding and succeeding steel strips fed continuously are cut and the cut end edges thus formed are welded by butt welding using a laser. The cutting and butting at the time of welding are effected with one edge of the preceding steel strips adjacent to the opposite ends of the succeeding steel strips aligned to be parallel with the center line of travel of the continuous processing line. When effecting the alignment, the preceding or succeeding steel strip is attracted by an electromagnetic chuck on a work table in the continuous processing line and is pulled by the chuck toward a reference block provided with an alignment edge parallel to the center line of travel of the processing line to bring the edge of the sheet into contact with the reference block. The alignment is done in this state.
In a continuous processing line, in which facing ends of preceding and succeeding steel strips are cut and the cut end surfaces are caused to abut as butt surfaces and are welded along the butt line formed by the abutting, a method of cutting and welding steel strips, in which, when cutting, abutting and welding facing ends of the steel strips, at the time of the cutting or abutting prior to the welding, either said preceding steel strip or said succeeding steel strip is attracted by an electromagnetic chuck in at least one work table in said continuous processing line, and said electromagnetic chuck is moved to pull said preceding or succeeding steel strip until it strikes a reference block disposed parallel to the center line of said continuous processing line to align one edge of said preceding or succeeding steel strip to be parallel to said center line.
In a continuous processing line, in which the facing ends of preceding and succeeding steel strips are cut, and the cut end surfaces are caused to abut as butt surfaces and are welded along the butt line formed by the abutting, a method of cutting and welding wherein, when cutting, abutting and welding the facing ends of said steel strips, at the time of the abutting, on at least one work table in said continuous processing line, one of said steel strips is held attracted by an electromagnetic chuck at a position either upstream or downstream a running line, along which a torch for effecting said welding runs in a direction perpendicular to the center line of said continuous processing line, with one edge of the steel strip aligned to be parallel to said center line and the butt surface at said facing end in register with said running line, a portion of the other steel strip adjacent to said facing end is raised so that said butt surface is directed downwardly and obliquely toward said butt surface of said one steel strip, and in this state said butt surface of said facing end of said other steel strip is caused to approach said butt surface of said one steel strip.
A method for butt-welding preceding and succeeding steel strips using a laser beam, at a continuous processing line, in which a trailing end of said preceding strip and a leading end of said succeeding steel strip are cut to form a trailing end edge and a leading edge, respectively, and then said trailing end edge and said leading end edge are butted against each other, thereby forming a butting line between said trailing end edge and said leading end edge and thereafter said preceding and succeeding steel strips are butt-welded by running a laser beam torch along a torch running line in conformity with said butting line, characterized in that said method comprises the steps of:
Dependencies are inferred from the claim text.