Patent application number | Description | Published |
20130129411 | WELDED STRUCTURE AND WELDING METHOD - A hole that has two opposing sides is opened in a first part to be welded, two slits are formed in corresponding portions in a second part to be welded at positions corresponding to the hole, and a bridge portion that is made to protrude by plastic deforming a portion between the two slits is provided. A raised portion of the bridge portion of the second part to be welded is inserted into the hole of the first part to be welded, such that the two sides of the hole in the first part to be welded overlap with the two slits in the bridge portion of the second part to be welded, and the first part to be welded and the second part to be welded are welded together while the first part to be welded and the second part to be welded are engaged. | 05-23-2013 |
20130187323 | WELDING STRUCTURE AND WELDING METHOD USING THREE POSITIONING PORTIONS - A welding structure includes a sheet-shaped first part to be welded; a sheet-shaped second part to be welded that is positioned with respect to the first part to be welded by engaging with the first part to be welded, to perform welding; and a first positioning portion, a second positioning portion, and a third positioning portion, at which the first and second parts to be welded engage with each other. The first to third positioning portions are each configured to restrict movement of one of the first and second parts to be welded in a positioning direction, with respect to the other, and enable movement of the one in a movable direction perpendicular to the positioning direction, with respect to the other. The movable direction of each of the first and second positioning portions is the same direction as the positioning direction of the third positioning portion. | 07-25-2013 |
20140048518 | LASER WELDING APPARATUS AND LASER WELDING METHOD - A laser welding apparatus generates laser by a laser oscillator, converges the laser by a condenser lens, and applies the laser to an upper sheet and a lower sheet superposed together so as to weld the upper sheet and the lower sheet to each other. According to this apparatus, by laser irradiation, a melt pool Y is formed in the upper sheet and the lower sheet superposed together. Furthermore, by laser irradiation, the melt pool Y is caused to flow, and the upper sheet and the lower sheet are welded together. | 02-20-2014 |
20140377578 | WELDED STRUCTURE WITH AT LEAST THREE LASER WELDED NUGGETS ARRANGED ALONG A VIRTUAL CLOSED CURVE, AND CORRESPONDING LASER WELDING METHOD - A welded portion ( | 12-25-2014 |
20150246413 | WELDED PORTION INSPECTION METHOD - A welded portion inspection method accurately identifies emitted light from a molten portion during inspection laser light irradiation, enabling reliable inspection. When transitioning from welding laser light irradiation to inspection laser light irradiation, the welding laser light irradiation is interrupted and then the welding laser light is switched to the inspection laser light. In inspecting a welded portion, two points in time at which the emitted light intensity is equal to or less than a certain threshold value are extracted from an intensity waveform of the emitted light as an inspection start point in time and an inspection end point in time. The interval between the inspection start and end points is estimated as being a irradiation period of the inspection laser light. The welded state is inspected based on the intensity waveform of the emitted light in the irradiation period. | 09-03-2015 |
20150266131 | LASER WELDING INSPECTION APPARATUS AND LASER WELDING INSPECTION METHOD - Provided is a laser welding inspection apparatus capable of improving the accuracy for determining the welding defect. The laser welding inspection apparatus includes a head which irradiates a welded portion of a workpiece with a laser beam for inspection, an optical receiver which receives a return light of the laser beam for inspection from the welded portion, an optical system which adjusts at least a focal diameter of the laser beam for inspection applied to the welded portion and a region where the return light from the welded portion is recognized, and a controller which controls the optical system and determines, based on intensity of the return light, whether a welding defect exists in the welded portion. The controller controls the optical system so that a diameter of the region is not more than 1.5 times as large as the focal diameter. | 09-24-2015 |
20150266132 | LASER BEAM WELDING APPARATUS AND LASER BEAM WELDING METHOD - Provided is a laser beam welding apparatus capable of correctly detecting the beginning and the end of one welding point even in remote laser beam welding. The laser beam welding apparatus includes a head which irradiates a workpiece with a laser beam, an optical receiver which receives a reflected light of the laser beam from the workpiece, and a controller. The optical receiver receives only a laser beam and a plasma of the reflected light. The controller determines that one welding point begins when a time during which intensity of the reflected light is larger than or equal to a second set-intensity is longer than or equal to a first set-time, and determines that the one welding point ends when a time during which the intensity of the reflected light is smaller than or equal to a first set-intensity is longer than or equal to a second set-time. | 09-24-2015 |
20150283648 | LASER WELD METHOD AND WELD STRUCTURE - A laser welding method includes: forming a melted section in which plural metallic workpieces within a weld region are melted by projecting a first laser beam onto said weld region with parts of the workpieces being set as the weld region when the workpieces are welded; and projecting a second laser beam while the melted section is being solidified or after a solidified section in which the melted section is solidified is formed such that the second laser beam circles around center of the melted section or the solidified section from an irradiation start position deviated from said center toward said center or such that the second laser beam is focused to the center of the melted section or the solidified section from an irradiation start region that includes the center and a periphery thereof. | 10-08-2015 |