A method for the preparation of steel sheets for fabricating a welded steel blank is provided. The method includes a step of removing at least part of the first and second metal alloy layers in first and second peripheral zones of pre-coated steel first and second sheets, respectively, by simultaneously ablating the first and second precoatings in the first and second peripheral zones of the pre-coated steel first and second sheets to define first and second ablation zones, the first and second peripheral zones being zones of the first and second principal faces closest to the median plane and located on either side of the median plane.

A method for the preparation of steel sheets for fabricating a welded steel blank is provided. The method includes a step of removing at least part of the first and second metal alloy layers in first and second peripheral zones of pre-coated steel first and second sheets, respectively, by simultaneously ablating the first and second precoatings in the first and second peripheral zones of the pre-coated steel first and second sheets to define first and second ablation zones, the first and second peripheral zones being zones of the first and second principal faces closest to the median plane and located on either side of the median plane.

Hybrid welding methods include directing a laser beam from a laser onto a first component that is vertically offset from a second component, and, directing a weld arc from an arc welder onto a weld joint between the first component and the second component to weld the first and second components together.

Hybrid welding methods include directing a laser beam from a laser onto a first component that is vertically offset from a second component, and, directing a weld arc from an arc welder onto a weld joint between the first component and the second component to weld the first and second components together.

A hybrid welding method and a hybrid welding apparatus that can perform welding without dropping a weld metal even in a case of butt-welding in which a gap is present between base materials is provided. A hybrid welding apparatus according to the present invention is a hybrid welding apparatus that butt-welds a first joint and a second joint using laser welding and arc welding, and includes a laser welding device that includes a laser head that irradiates laser light to a welded portion and an arc welding device that includes a welding torch that supplies a filler metal to the welded portion. It is configured such that the laser head is capable of performing horizontal welding and disposed on an upstream side in a welding direction, the welding torch is capable of performing horizontal welding and disposed on a downstream side in the welding direction, and horizontal welding is performed with the first joint and the second joint disposed vertically so as to obtain a substantially horizontal weld line.

A continuous welding method and device for a hybrid welding, a welded finished product and a train body. The method comprises: performing hybrid welding on a groove of a welding piece by coupling a laser and a variable polarity arc; wherein the defocusing distance of the laser is not less than a Rayleigh length of the laser. According to the method of the present disclosure, the power density of the laser on the surface of the welding piece is effectively reduced and the height-width-ratio of the weld seam is decreased, the diameter of the welding melted pore is increased, the voids caused by the collapse of the small pore in the welding melted pore can be effectively reduced, thereby solving the problem that the weld porosity is difficult to escape in the prior art, and reducing the generation of the pores, effectively improving welding stability and reliability, and improving the mechanical properties of the weld seams.

A continuous welding method and device for a hybrid welding, a welded finished product and a train body. The method comprises: performing hybrid welding on a groove of a welding piece by coupling a laser and a variable polarity arc; wherein the defocusing distance of the laser is not less than a Rayleigh length of the laser. According to the method of the present disclosure, the power density of the laser on the surface of the welding piece is effectively reduced and the height-width-ratio of the weld seam is decreased, the diameter of the welding melted pore is increased, the voids caused by the collapse of the small pore in the welding melted pore can be effectively reduced, thereby solving the problem that the weld porosity is difficult to escape in the prior art, and reducing the generation of the pores, effectively improving welding stability and reliability, and improving the mechanical properties of the weld seams.

The invention relates to a welding device (1) having a welding torch (2), a feeder (3) for feeding a melting filler material (4) at a feed rate (v) to a weld (S), where the filler material (4) is melted with the aid of an electric arc (L), and a pre-heater (9) for heating the filler material (4) upstream of the weld (S) by means of a laser beam (7) having a laser power (P) and generated in a laser device (6). For space-saving and safe heating of the filler material (4) upstream of the weld (S), the pre-heater (9) includes a feed channel (5) for the filler material (4), and at least one deflector (8) is attached to the pre-heater (9) for deflecting the laser beam (7) to the filler material (4) in such a way that the laser beam (7) strikes the filler material (4) inside the feed channel (5) of the pre-heater (9).

The invention relates to a welding device (1) having a welding torch (2), a feeder (3) for feeding a melting filler material (4) at a feed rate (v) to a weld (S), where the filler material (4) is melted with the aid of an electric arc (L), and a pre-heater (9) for heating the filler material (4) upstream of the weld (S) by means of a laser beam (7) having a laser power (P) and generated in a laser device (6). For space-saving and safe heating of the filler material (4) upstream of the weld (S), the pre-heater (9) includes a feed channel (5) for the filler material (4), and at least one deflector (8) is attached to the pre-heater (9) for deflecting the laser beam (7) to the filler material (4) in such a way that the laser beam (7) strikes the filler material (4) inside the feed channel (5) of the pre-heater (9).

A system, apparatus, and method in which an induction head is used to impinge an electromagnetic force field on a molten metal bead to shape same, e.g., to flatten same.