Provided is a laser welding apparatus configured to weld an electrode lead of at least one secondary battery of a battery module and a main bus bar configured to electrically connect a plurality of secondary batteries to each other. The laser welding apparatus includes: a laser beam emitting unit including a laser emitting element to irradiate a laser beam to the electrode lead and the main bus bar; a pressing jig including a pressing bar configured to move in a left-and-right direction such that the electrode lead is adhered to the main bus bar; and a blocking block movable to block the laser beam generated in the laser beam emitting unit from reaching the at least one secondary battery or movable to allow the generated laser beam to pass therethrough, according to a position of the pressing bar moved in the left-and-right direction.

In a laser welding method, generation of relatively large blow holes in a welding part is prevented while decrease in productivity is reduced. The laser welding method for lap welding, using a laser beam LB, of a plurality of metal plates and including an aluminum alloy cast plate includes: a melting path of scanning and irradiating circularly a superimposed part of the aluminum alloy plate and the aluminum alloy cast plate with a first laser beam LB1 to form a molten pool of the molten aluminum alloy plate and the molten aluminum alloy cast plate; and a stirring path of scanning and irradiating circularly the molten pool with a second laser beam LB2 having a scanning speed V.sub.2 faster than a scanning speed V.sub.1 of the first laser beam LB1 to stir the molten pool.

In a laser welding method, generation of relatively large blow holes in a welding part is prevented while decrease in productivity is reduced. The laser welding method for lap welding, using a laser beam LB, of a plurality of metal plates and including an aluminum alloy cast plate includes: a melting path of scanning and irradiating circularly a superimposed part of the aluminum alloy plate and the aluminum alloy cast plate with a first laser beam LB1 to form a molten pool of the molten aluminum alloy plate and the molten aluminum alloy cast plate; and a stirring path of scanning and irradiating circularly the molten pool with a second laser beam LB2 having a scanning speed V.sub.2 faster than a scanning speed V.sub.1 of the first laser beam LB1 to stir the molten pool.

A method of attaching a first metal object to a second metal object is presented. The first metal object and the second metal object are dissimilar materials. The first metal object comprises an upper surface and a lower surface. The method comprises: positioning the first metal object in intimate contact with the second metal object such that the second metal object is in contact with the lower surface of the first metal object; identifying at least one attachment location on the upper surface of the first metal object where the first metal object is in intimate contact with the second metal object; adding a powdered metal on the upper surface of the first metal object at the at least one attachment location; and firing a heat source at the powdered metal to melt the powdered metal and drive the melted powdered metal through the first metal object and into the second metal object.

A method of attaching a first metal object to a second metal object is presented. The first metal object and the second metal object are dissimilar materials. The first metal object comprises an upper surface and a lower surface. The method comprises: positioning the first metal object in intimate contact with the second metal object such that the second metal object is in contact with the lower surface of the first metal object; identifying at least one attachment location on the upper surface of the first metal object where the first metal object is in intimate contact with the second metal object; adding a powdered metal on the upper surface of the first metal object at the at least one attachment location; and firing a heat source at the powdered metal to melt the powdered metal and drive the melted powdered metal through the first metal object and into the second metal object.

A joining system (100) of the present invention is for joining a joining target (W) including first, second, and third members (W1), (W2), (W3), and includes a welder (101), a friction stir welding machine (102), and a controller (110) that: (A) causes the welder (101) to weld the second and third members (W2), (W3); (B), after (A), causes the joining target (W) to be placed at the friction stir welding machine (102) so that the first member (W1) is opposed to a distal end of a tool (10); and (C), after (B), controls a linear motion driver (7) and a rotation driver (8) so as to, while pressing the distal end of the tool (10) to the joining target (W), rotate the tool (10) around an axis, so that the softened second and third members (W2), (W3) intrude into the softened first member (W1), thus joining the joining target (W).

The present disclosure provides three-dimensional (3D) objects, 3D printing processes, as well as methods, apparatuses and systems for the production of a 3D object. Methods, apparatuses and systems of the present disclosure may reduce or eliminate the need for auxiliary supports. The present disclosure provides three dimensional (3D) objects printed utilizing the printing processes, methods, apparatuses and systems described herein.

The present disclosure provides three-dimensional (3D) objects, 3D printing processes, as well as methods, apparatuses and systems for the production of a 3D object. Methods, apparatuses and systems of the present disclosure may reduce or eliminate the need for auxiliary supports. The present disclosure provides three dimensional (3D) objects printed utilizing the printing processes, methods, apparatuses and systems described herein.

A method for manufacturing a stator for a rotary electric machine including: a process of abutting, on each other, tip end parts of one coil piece and an other one coil piece for forming a stator coil of a rotary electric machine; and a welding process of irradiating a welding target location regarding the tip end part having been abutted with a laser beam having a wavelength of 0.6 μm or less, in which in the welding process, the laser beam is generated for every pulse oscillation in a laser oscillator in a mode of having a laser output of 3.0 kW or more, and in at least a part of a period during one pulse oscillation, the laser beam is moved so that an irradiation position changes linearly parallel to an abutment surface of the tip end part.

A method for manufacturing a stator for a rotary electric machine including: a process of abutting, on each other, tip end parts of one coil piece and an other one coil piece for forming a stator coil of a rotary electric machine; and a welding process of irradiating a welding target location regarding the tip end part having been abutted with a laser beam having a wavelength of 0.6 μm or less, in which in the welding process, the laser beam is generated for every pulse oscillation in a laser oscillator in a mode of having a laser output of 3.0 kW or more, and in at least a part of a period during one pulse oscillation, the laser beam is moved so that an irradiation position changes linearly parallel to an abutment surface of the tip end part.