Method for producing a precoated steel blank including the successive steps of: —providing a precoated steel strip including a steel substrate having, on at least one of its main faces, a precoating, the precoating including an intermetallic alloy layer and a metallic layer extending atop said intermetallic alloy layer, the metallic layer being a layer of aluminum, a layer of aluminum alloy or a layer of aluminum-based alloy, —laser cutting the precoated steel strip in order to obtain at least one precoated steel blank, the precoated steel blank including a laser cut edge surface resulting from the laser cutting operation, the laser cut edge surface including a substrate portion and a precoating portion, wherein the laser cutting is carried out in such a way that the substrate portion of the laser cut edge directly resulting from the cutting operation has an oxygen content greater than or equal to 15% in weight.

A component arrangement and a method for producing the component arrangement are provided. The component arrangement includes a first component and a second component, which are arranged in an overlapping arrangement and are connected by a laser fillet weld and at two fixing points arranged laterally offset from the laser fillet weld, one of the components is provided with at least one projection, which projects in the direction of the other component and which is arranged and formed such that, when the components are positioned correctly in relation to one another and are pressed together at the fixing points, a flange portion of the first component, set at an angle in the region of the laser fillet weld to be formed, is pressed onto the second component by way of the component edge. For sealing the component arrangement, the fixing points are arranged set back into the overlapping region with respect to the laser fillet weld, and at least between the fixing points there is formed a continuous bonding region, in which the first and second components are bonded to one another.

A method for joining two components of a meltable material comprises the steps of providing a first component having a first border region and a second component having a second border region, placing the second component relative to the first component so as to form an overlap between the first border region and the second border region under a gap between the first border region and the second border region, continuously heating opposed sections of the first border region and the second border region at the same time through at least one energy source arranged in the gap at least partially, continuously providing a relative motion of the at least one energy source along the first border region and the second border region in the gap, and continuously pressing already heated sections of the first border region and the second border region onto each other.

A laser processing method of laser processing a workpiece made of at least one sheet of metallic foil includes: generating laser light by supplying pulsed pumping energy to a laser medium, the laser light including an optical pulse component and a continuous light component that is continuous with the optical pulse component and temporally after the optical pulse component; irradiating a surface of the workpiece with the laser light; and limiting duration of the continuous light component such that a ratio of energy of the continuous light component to energy of the optical pulse component is equal to or less than a predetermined value.

A tool for friction bit joining a workpiece material includes a bit with a tapered pin and a non-cutting tip. The bit has a top surface opposite the pin with at least one feature recessed in, or extending from, the top surface and configured to transmit torque to the bit to rotate the bit around a rotational axis.

A grain-oriented electrical steel sheet according to the present invention includes a base steel sheet having plural grooves on a surface and a glass film formed on the surface of the base steel sheet. In case of viewing region including grooves in cross section orthogonal to groove longitudinal direction, a straight line passing through peak point present on profile line of glass film and parallel to groove width direction orthogonal to sheet thickness direction in cross section is defined as reference line, a point present on boundary line between glass film and base steel sheet and present at lowest location in sheet thickness direction is defined as deepest point, and a point present on boundary line and present at the highest location in the sheet thickness direction in region having the deepest point in a center and having length of 2 μm in groove width direction is defined as shallowest point, a relationship between shortest distance A between reference line and deepest point and shortest distance B between reference line and shallowest point satisfies Expression (1).
0.1 μm≤A−B≤5.0 μm  (1)

A beam vibrating mechanism vibrates a laser beam in a parallel direction with a cutting advancing direction of a sheet metal. An amplitude amount of the laser beam is Qx, a radius of a first circular region having an area occupying 86% beam energy at a center side of total beam energy in a sectional area of the laser beam on a top surface of the sheet metal is rtop, and a radius of a second circular region having an area occupying 86% beam energy at a center side of total beam energy in a sectional area of the laser beam in a bottom surface of the sheet metal is rbottom. A calculation value Va is expressed by the expression: Va=(Qx+rtop+√{square root over (2)}×rbottom). When a standard deviation of the calculation value Va at a time of cutting sheet metals of a plurality of plate thicknesses is Vasd, a nozzle having a diameter of an opening between a minimum value obtained by 2Va−Vasd, and a maximum value obtained by 2.5 Va+Vasd is used as a nozzle attached to a machining head.

A laser processing method for laser processing of a workpiece made of a base material and a fiber reinforced composite material containing fibers having a thermal conductivity and a processing threshold higher than physical properties of glass fibers. The laser processing method includes a step of processing the workpiece by forming a plurality of through-holes extending through the workpiece by irradiating the workpiece with pulsed laser light from a processing head while relatively moving the workpiece and the processing head in a predetermined cutting direction. The pulsed laser light has a pulse width smaller than 1 ms and an energy density capable of forming each of the through-holes by a single pulse.

To form linear grooves of desired groove width on a metal strip surface and provide a grain-oriented electrical steel sheet having excellent magnetic properties, a linear groove formation method comprises: forming a resist coating on at least one surface of a metal strip; thereafter irradiating the resist coating with a laser while scanning the laser in a direction crossing a rolling direction of the metal strip, to remove the resist coating in a part irradiated with the laser; and thereafter performing etching treatment to form a linear groove in a part of the metal strip in which the resist coating is removed, wherein the resist coating contains a predetermined amount of an inorganic compound, and on the surface of the metal strip, the laser has a predetermined elliptic beam shape.

A joined body includes: a thin plate including through holes; a first member including a proximal portion having a portion contacting the thin plate, and a protruding portion that protrudes in relation to a contact surface of the proximal portion and is inserted through the through hole; and a second member arranged oppositely to the proximal portion via the thin plate and made of a material that is same as that of the first member. The thin plate is made of a material having a specific gravity smaller than that of the material forming the first and the second members. The second member and an end portion of the protruding portion are connected to each other, by a part of the second member and a part of the end portion being melt-solidified, the end portion being at a side opposite to a side connected to the proximal portion.