The invention discloses a method for preparing an anticorrosive surface layer of a metal material in a marine environment by laser, which belongs to the technical field of laser processing. First, the laser cladding method is used to prepare a cladding surface layer on the surface of the metal material that is not easy to undergo chemical substitution reaction with the chlorides (NaCl, MgCl.sub.2 , CaCl.sub.2 etc.) in the seawater. Then, on the surface of the cladding surface layer, ultrafast laser processing is used to form a surface layer with a wetting angle (and water) greater than 90 degrees and with hydrophobic characteristics.

The present disclosure is directed to a multi-segment device, such as an intravascular guide wire. The multi-segment device includes an elongate first portion comprising a first metallic material, an elongate second portion comprising a different metallic material, the first and second elongate portions being directly joined together end to end by a solid-state weld, and a heat affected zone surrounding an interface of the weld where the first and second portions are joined together, wherein the heat affected zone has an average thickness of less than about 0.20 mm.

A method for the manufacture of an assembly of at least two metallic substrates spot welded together through at least one spot welded joint, such method including two steps, the assembly obtainable according to this method and the use of this assembly for the manufacture of automotive vehicle.

There is provided a resistance spot welding apparatus including a first rod-shaped electrode body, second rod-shaped electrode body, first ring-shaped member, second ring-shaped member, first elastic body, and second elastic body. The first rod-shaped electrode body and second rod-shaped electrode body are arranged facing each other, the first rod-shaped electrode body is inserted into a through hole of the first ring-shaped member, the first elastic body is connected to an opposite side of first ring-shaped member to second rod-shaped electrode body side, the first rod-shaped electrode body and first ring-shaped member are not electrically connected to each other, the second rod-shaped electrode body is inserted into a through hole of the second ring-shaped member, the second elastic body is connected to an opposite side of second ring-shaped member to first rod-shaped electrode body side, and the second rod-shaped electrode body and second ring-shaped member are not electrically connected each other.

The invention relates to a method for laser welding the end faces of the joints (5, 6) of two connecting flanges (3, 4), which are held in an adjoining manner, of two connecting partners (1, 2) made of a steel material. According to the method, in addition to being moved in the advancement direction, which follows the longitudinal extension of the joints (5, 6), the welding laser beam (8) is moved back and forth in an oscillating manner transversely to the advancement direction. At least one of the two connecting partners (1, 2) to be welded at the connecting flange (3, 4) joints (5, 6) is equipped with a metal coating at least in the region of the respective connecting flange (3, 4). The weld pool produced by the energy input during the laser welding process is kept in a liquid state in order to allow degassing processes and/or distribution processes to be carried out in a controlled manner for phases of the metal coating of the at least one connecting partner, said metal coating being integrated by the welding process, wherein the welding laser beam is oscillated at a frequency of at least 80 Hz.

A resistance spot welding method includes: performing test welding; and performing actual welding after the test welding, wherein in subsequent current passage in the test welding, current passage is performed by constant current control under a condition: 0.5 ? Vtp/Vtm ? 2.0 when tc<800 ms; 0.5?0.3.Math.(tc?800)/800 ? Vtp/Vtm ? 2.0?0.5.Math.(tc?800)/800 when 800 ms ? tc<1600 ms; and 0.2 ? Vtp/Vtm ? 1.5 when tc ? 1600 ms, and wherein in main current passage in the actual welding, adaptive control welding is performed, and in subsequent current passage in the actual welding, current passage is performed by constant current control under a condition: 0.8.Math.Itp ? Imp ? 1.2.Math.Itp.

Disclosed are an aluminum-coated blank, a manufacturing method thereof, and an apparatus for manufacturing the same. The blank includes two or more aluminum-coated steel sheets connected together by a joint, each of the steel sheets including: a base steel sheet including 0.01-0.5 wt % of carbon, 0.01-1.0 wt % of silicon, 0.5-3.0 wt % of manganese, greater than 0 but not greater than 0.05 wt % of phosphorus, greater than 0 but not greater than 0.01 wt % of sulfur, greater than 0 but not greater than 0.1 wt % of aluminum, greater than 0 but not greater than 0.001 wt % of nitrogen, and the balance of iron and other inevitable impurities; and a coating layer including aluminum and formed on at least one surface of the base steel sheet.

The present invention provides a resistance spot welding method. A resistance spot welding method according to the present invention in which a sheet combination of two or more overlapping steel sheets is sandwiched between a pair of electrodes and joined together by applying current while applying pressure, the method including a main current application step in which current application is performed with a current I.sub.w (kA), and subsequently, a post-tempering heat treatment step in which after cooling is performed for a cooling time t.sub.ct (ms) shown in formula (1) below, current application is performed with a current I.sub.t (kA) shown in formula (2) below for a current application time t.sub.t (ms) shown in formula (3) below: 800?t.sub.ct . . . formula (1), 0.5?I.sub.w?I.sub.t?I.sub.w . . . formula (2), and 500?t.sub.t . . . formula (3).

A high resolution system for additive manufacturing, soldering, welding and other laser processing applications. A blue laser system for additive manufacturing, soldering, welding and other laser processing applications and operation for additive manufacturing of materials. Systems and methods for laser processing of materials, laser processing by matching preselected laser beam wavelengths to the material to be processed to have high or increased levels of absorptivity by the materials, and in particular laser additive manufacture of raw materials into large structures, parts, components and articles with laser beams having high absorptivity by starting raw materials.

A method for welding balls provides a component, provides at least two balls, places at least one first ball of the at least two balls on the component, and applies an electrical voltage in such a manner that a current flows through the at least two balls and through the component, wherein the at least two balls are simultaneously welded together and the first ball is simultaneously welded to the component.