An adjustment of the amount of energy in at least one specific applying unit is executed when energy is applied to a cylindrical member pair in which another cylindrical member is inserted inside a cylindrical member to melt and weld the cylindrical member pair in a circumferential direction. The adjustment is executed in association with a rotation angle to satisfy a relationship of Pd+Pw>, wherein Pd is an output decease rotation angle that decreases the energy amount from a steady energy amount HP applied from the specific applying unit in a welding end process, Pw is an overlap rotation angle at which the irradiation parts around the cylindrical member pair overlap with the steady energy amount HP, and is a separation angle between the specific applying unit and another applying unit adjacent to each other in a rotation direction around the axis.

An adjustment of the amount of energy in at least one specific applying unit is executed when energy is applied to a cylindrical member pair in which another cylindrical member is inserted inside a cylindrical member to melt and weld the cylindrical member pair in a circumferential direction. The adjustment is executed in association with a rotation angle to satisfy a relationship of Pd+Pw>, wherein Pd is an output decease rotation angle that decreases the energy amount from a steady energy amount HP applied from the specific applying unit in a welding end process, Pw is an overlap rotation angle at which the irradiation parts around the cylindrical member pair overlap with the steady energy amount HP, and is a separation angle between the specific applying unit and another applying unit adjacent to each other in a rotation direction around the axis.

A method of manufacturing an airfoil includes creating a plurality of cavities separated by a plurality of internal ribs in an airfoil forging. At least one hole is drilled in at least one of the plurality of internal ribs with a waterjet drilling tool. At least one hole extends perpendicularly to a wall of the rib.

A method of cutting a polarizing plate by using a laser, and a polarizing plate cut using the same. A beam shape of the laser is configured to have an elliptical shape and a major axis of the elliptical shape parallel to a cutting direction to provide excellent cross-sectional quality and improved productivity.

A method for attaching an object, such as a sight glass (3) or an electrical connector (4), to a structure, such as a valve housing (1), the object (3, 4) comprising an annular flange (6, 11). The object (3, 4) is mounted in an opening (7, 12) of the structure (1) with the annular flange (6, 11) in abutment with an annular edge (8, 13) of the opening (7, 12). The object (3, 4) is attached to the structure (1) by performing welding of the annular edge (8, 13) and the annular flange (6, 11) and displacing the welding beam along the annular flange (6, 11).

A method for attaching an object, such as a sight glass (3) or an electrical connector (4), to a structure, such as a valve housing (1), the object (3, 4) comprising an annular flange (6, 11). The object (3, 4) is mounted in an opening (7, 12) of the structure (1) with the annular flange (6, 11) in abutment with an annular edge (8, 13) of the opening (7, 12). The object (3, 4) is attached to the structure (1) by performing welding of the annular edge (8, 13) and the annular flange (6, 11) and displacing the welding beam along the annular flange (6, 11).

An electric motor, in particular for a motor vehicle, having a cylindrical motor housing and having a fastening flange, the motor housing having a housing shell which is open both on a first end side and on the opposite second end sides, the fastening flange being configured with a bearing seat, and the fastening flange being connected to the housing shell on the second end sides.

The invention provides a method of manufacturing a press formed product which reduces the welding time and enhances the productivity. First, a main steel plate and a reinforcement steel plate are bonded by laser welding a superposed portion of the main steel plate and the reinforcement steel plate to form a superposed blank member. This superposed blank member is heated to higher temperature than the austenite transformation temperature to transform the superposed blank member into austenite. The superposed blank member transformed into austenite is then press formed and rapidly cooled with dies at the same time to be transformed into martensite, thereby forming a press formed product.

A method for producing a component structure of two components includes subjecting the components to beam energy for melting in a contact region. A variation of beam current is set to melt the components in the contact region over a defined component depth less than the perpendicular distance between sides of the contact region. A defined beam current pulse is periodically imparted to the variation of the beam current, to melt the components at least approximately over the entire perpendicular distance between the sides of the contact region and to produce in the region of the second side weld regions of a weld root of the weld connecting the components projecting from the contact region and form a pattern which representative of a weld quality. Between the weld regions there is no melting of the components in the region between the defined component depth and the second side.

A method for producing a component structure of two components includes subjecting the components to beam energy for melting in a contact region. A variation of beam current is set to melt the components in the contact region over a defined component depth less than the perpendicular distance between sides of the contact region. A defined beam current pulse is periodically imparted to the variation of the beam current, to melt the components at least approximately over the entire perpendicular distance between the sides of the contact region and to produce in the region of the second side weld regions of a weld root of the weld connecting the components projecting from the contact region and form a pattern which representative of a weld quality. Between the weld regions there is no melting of the components in the region between the defined component depth and the second side.