A processing plant for metal strips (1) has a welding machine, a strip store downstream of the welding machine and a processing device downstream of the strip store. The metal strips are welded to form a continuous strip with the welding machine, which is stored in the strip store and output from there to the processing device. The metal strips are connected via diagonally extending weld seams. To join the weld seams, first the strip head (2) and the strip foot (3) of the metal strips are twisted and the two strips are connected by forming the weld seam. The weld seam extends only transversely to the transport direction (x) during the welding process. Finally, the strip head and the strip foot of the metal strips are twisted back again. As a result, the weld seam now extends diagonally to the transport direction (x).

A six-high rolling (also known as sexto) mill stand that is suited for hot rolling an intermediate strip into a thin strip that is less than 0.8 mm thick. A combined casting and rolling installation that includes the six-high rolling mill stand allowing for hot rolling in long uninterrupted sequences, without any change of the work rolls to obtain a strip with good geometry due to moderate rolling forces.

The present invention relates to an intermediate blank connection system for hot-rolled strip headless rolling and a connection method, and belongs to the technical field of intermediate blank connection for strip steel headless rolling. The connection system and the connection method realize matching of an intermediate blank connection device and speed of a unit through a translation drive system. A mounting frame is used to provide support for cutting devices, and the cutting devices are divided into two groups arranged in the mounting frame to achieve clamping of a front slab and a rear slab respectively. Interlaced dovetail cutting edge structures are used to achieve cutting and ensure a good longitudinal stress state. Finally, a certain difference is set in sizes of width directions between cutting edges, to ensure that there is certain extrusion deformation in a process of forming dovetail cutting groove connection, and enhance a connection effect. At the same time of realizing a good intermediate blank connection effect finally, a structure of the connection device is greatly simplified, and investment and operating cost is reduced.

A cold-rolled steel strip manufacturing facility includes: a joining device configured to join a trailing end of a preceding steel strip and a leading end of a following steel strip to form a joined steel strip; a looper configured to store the joined steel strip; a heating device configured to heat a joint portion between the preceding steel strip and the following steel strip over an entire width direction; and a cold rolling mill configured to cold-roll the joined steel strip for which the joint portion was heated by the heating device, wherein the heating device is switchable between an output state and a non-output state, and during a period in which the joint portion passes through the heating device, is switched to the output state.

A welding machine, preferably of the flash butt welding type, designed to facilitate maintenance of the clamping means, e.g. clamps, of the two longitudinal metal products to be welded. Advantageously, a first structure, provided with first clamping means, and a second structure, provided with second clamping means, are supported in a first part of the carriage delimited by a first beam and a second beam of the carriage parallel to the feeding direction, while at least one transformer is fixed to the carriage and supported in a second part of the carriage, arranged laterally outside the first part.

Cutting equipment for steel strips (1), the cutting equipment including: a cutting device (4) configured to laser cut a vicinity of a joint portion (2) in which a rear end of a preceding steel strip and a front end of a succeeding steel strip are joined that has been detected by a joint portion detection device (5), and a vicinity of a defective portion of the steel strips that has been detected by a defect detection device (8); and a control unit (9), wherein the control unit includes a plurality of modes, including a first cut mode that causes laser cutting in the vicinity of the joint portion, and a second cut mode that causes laser cutting in the vicinity of the defective portion, and the control unit operates the cutting device in accordance with one cut mode in the plurality of modes.