Metal fusion bonding – Process – With shaping
Patent
1987-11-28
1989-06-20
Godici, Nicholas P.
Metal fusion bonding
Process
With shaping
228170, 228171, 228 57, 228 494, 21912163, 21912164, 21912182, 219161, B23K 2602, B23K 2610
Patent
active
048403032
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method and an apparatus for cutting and welding steel strips. More particularly, the invention concerns a method and an apparatus for cutting and welding steel strips for a steel strip processing line, in which facing ends of preceding and succeeding steel strips are cut in the width-wise direction and the cut surfaces are welded together as butt surfaces to obtain a butt joint whereby the resultant joined steel strips can be subject to continuous rolling, stamping and other processings, and in which at the time of the cutting and butt welding of steel strips the facing ends thereof
are cut with high accuracy and are butt welded by a laser beam, for instance, with the center line of the steel strips aligned to be in register or parallel with the center line of the processing line, thus permitting high accuracy joining of the steel strips and permitting a high quality welded artifact to be obtained.
BACKGROUND OF THE INVENTION
Heretofore, in order to perform rolling and other processing ancillary thereto on steel strips (hereinafter referred to as rolling processing) in a steel strip processing line, between two adjacent steel strips continuously supplied to the steel strip processing line, an end-to-end connection is achieved by butting and welding their opposite end edges. Also, such processing and rewinding, welding, slitting and cutting (hereinafter referred to as conditioning processing) are performed on steel strips of silicon steel, and then resultant steel strips are supplied as a product to the customer. Especially, in order to obtain a product having a unit weight required by the customer, steel strips are joined together by butt welding, thereby obtaining continuous steel strips having an end-to-end connection therein and cutting continuous steel strips as the product having said unit weight and then supplying to the customer the product in the form of coils or sheets. Therefore, the product, without aftertreatment of the weld portion formed during such conditioning processing is delivered to the customer, so that it is required to obtain a weld portion of high quality. Particularly, from the standpoint of reducing power loss, strips of silicon steel are required to be rolled to a thickness of about 0.35 mm or less. Therefore, such thin steel strips are required to be welded together before they are supplied to the customer. However, as to such thin strips, it is impossible to obtain a weld portion of high quality, as above described, by edge-preparation of cutting opposite ends of adjacent strips using the prior art shearing technique and then by butt-welding the resultant end edges thereof by prior art arc welding, such as TIG or MIG.
Namely, in both the former case of rolling processing and the latter case of conditioning processing between adjacent steel strips, the trailing end of a preceding steel strip and the leading end of a succeeding steel strip are cut by using the prior art shear welder forming a continuous process, and then the cut end edges opposed each other are caused to be butt-welded by the arc welding, i.e., TIG or MIG. In other words, in a continuous processing line constructed by the prior art shear welder, steel strips are caused to run from the upstream to the downstream, and there, are provided along this flow of steel strips, a cutting unit and a welding unit of steel strips at first end of the steel strip is cut by the shearing unit existing on the upstream, and then the strip is transferred to the downstream, where the opposite cutting ends between adjacent steel strips are butted and welded by the arc welding technique, such as TIG or MIG.
However, in the case of the arc welding, i.e., TIG or MIG, a large thermal influence zone is generated and also the width of the weld bead tends to be large. The arc welding technique therefore is unsuitable for butt-welding processes during conditioning processing of thin steel strips such as silicon steel strips. That is, when the MIG or TIG arc welding is used during the cond
REFERENCES:
patent: 3582609 (1971-06-01), Morley et al.
patent: 4139145 (1979-02-01), Moore
patent: 4563563 (1986-01-01), Ege
Fujii Mamoru
Nagasaka Shoji
Noda Kazuo
Ono Koji
Tajika Hiroshi
Godici Nicholas P.
Heinrich Samuel M.
Kawasaki Steel Corporation
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