Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Hitoshi Nishimura

Jingbo Wang

Masatoshi Nishio

Doukei Nagayasu

Makoto Ryudo

Ryo Ishikawa

Hideaki Yamaguchi

Yoshiaki Takenaka

Kiyotaka Eizumi

Yasushi Mukai

Atsuhiro Kawamoto

Junji Fujiwara

Hideaki Itoh

Hiroyuki Hayashikawa

Shigeki Yonemori

Jing-Bo Wang

Mitsuru Mukai

Takasi Kakutani

Rintaro Nishina

Motoki Morioka

A joint structure includes a first metallic material having a first projection, a second metallic material similar to and weldable to the first metallic material, and a different material having a first penetrating part and sandwiched between the first and second metallic materials, the different material being difficult to weld to the first and second metallic materials. The first projection is smaller than the first penetrating part and is spaced from the rim of the first penetrating part. The first projection is positioned in the first penetrating part and spaced from the second metallic material by a gap. The gap has a size of a predetermined percentage of the thickness of the first projection to which arc welding is applied. The first and second metallic materials are melted and joined together inside the first penetrating part to compress and fix the different material, so all three are fixed together.

Joint structure

A detector is configured to detect an output of a reflected beam from an exit end surface of a parallel plate. A determination unit is configured to determine that an abnormality occurs in the parallel plate when a detection value of the detector is smaller than a determination threshold.

Laser machining device

Laser processing device () includes: laser-beam switching apparatus () that switches between a first optical path and a second optical path as an optical path along which a laser beam is to travel, the first optical path including first fiber (), the second optical path including second fiber () that has a core diameter that is larger than a core diameter of first fiber (); and processing head () that illuminates a same processed point on workpiece () with a laser beam that has passed through the first optical path or the second optical path. When illumination with laser beam that has passed through the first optical path is performed for a predetermined period of time, laser-beam switching apparatus () switches from the first optical path to the second optical path.

Laser processing device and laser processing method

There is provided an optical axis alignment mechanism between the laser oscillator and the optical fiber. The laser oscillator emits laser light, which then emerges from the emission end of the optical fiber via the axis alignment mechanism. Part of the laser light is received on the light-receiving surface of the CCD camera of a laser light evaluator. Thus, the laser light evaluator acquires a light intensity distribution. The light intensity distribution is used by the optical axis alignment mechanism to align the axis of the laser oscillator with the axis of the optical fiber.

Alignment method

A laser processing head includes parallel plate () that shifts an optical axis of a laser beam to be emitted from a top to a bottom of body case () from a first optical axis to a second optical axis, parallel plate () that shift the optical axis of the laser beam from the second optical axis to a third optical axis, and body case () that accommodates holders (and) that respectively hold parallel plates (and). The laser processing head further includes a rotation mechanism that rotates holders (and) around a first rotary axis. Opening () that a laser beam reflected by an incident surface of second parallel plate () passes through is formed in holder (), and light receiving part () that receives the laser beam having passed through opening () is disposed in body case ().

Laser processing head and laser processing device using same

A laser device includes: a laser resonator for emitting a laser beam; a condenser lens for collecting the laser beam emitted from the laser resonator; an optical fiber for transmitting the laser beam collected by the condenser lens; at least one light sensor opposing a light receiving surface of the condenser lens and outside an optical path of the laser beam, the at least one light sensor detecting an amount of return light from the condenser lens; and a controller for determining a presence of an abnormality when a value of the amount detected by the at least one light sensor is greater than a predetermined maximum threshold.

Laser device

A laser welding method according to the present disclosure includes a step in which a third material is interposed between a first material and a second material, which are made of the same type of metal so as to be weldable to one another, and at least one of which is provided with a protruding portion, wherein the third material is difficult to weld to the first material and the second material and has a through-hole portion into which the protruding portion is inserted. The method also includes a step in which, when the third material is interposed between the first material and the second material, a region corresponding to the protruding portion is irradiated with a laser beam from the first material side, and the first material and the second material are welded via the through-hole portion. In the step in which the third material is interposed between the first material and the second material, a first gap is provided between the protruding portion and the inner peripheral face of the through-hole portion, and a second gap corresponding to the plate thickness of the first material is provided between the first material and the second material in the region corresponding to the protruding portion.

Laser welding method

A fiber coupling device () includes the following components: a wedge plate () for receiving light and refracting the light in a predetermined direction, a condenser lens () for collecting the light refracted by the wedge plate (); and an optical fiber () having an incident surface for receiving the light collected by the condenser lens (). The wedge plate () is held rotatable around the optical axis () of the light incident on the wedge plate (). The light refracted by the wedge plate () and collected by the condenser lens () is incident on a different point on the incident surface depending on the rotation angle of the wedge plate ().

Fiber coupling device

A fiber coupling device includes a housing and a window provided in the housing. The fiber coupling device is configured to collectively guide plural laser beams to at least a first fiber, the plurality of laser beams each being emitted from a corresponding one of plural external laser light sources and entering through a laser beam inlet. The housing is configured such that the laser beams enter the housing from the laser beam inlet. The window is provided inside the housing and faces the laser beam inlet. The fiber coupling device is not required to detach when an optical axis is adjusted.

A condenser lens for collecting a laser beam () is disposed between the laser oscillator and the incident end surface of the optical fiber. The laser beam () is divided into a plurality of beams (). The power of the laser beam () is measured and maximized by adjusting the position of the condenser lens. The FFP of the laser beam () is measured and minimized by adjusting the position of the condenser lens. These adjusted positions are stored as the first and second lens positions. The FFP of the laser beam () is measured while the condenser lens is being moved between these positions so as to make the BPP not more than a predetermined value.

Core adjustment method

The fiber component of the present invention has a fusion splice section for connecting optical fibers. The optical fiber as the receiver of transmitted light is coated with at least two-layer resin. In the vicinity of the fusion splice section for connecting optical fibers, the innermost layer of a resin-coat section is uncovered with other resin coat at the boundary between the resin-coat section and resin-coat removed section of the optical fiber coated with two-layer resin. The structure effectively releases light and suppresses increase in temperature of the resin-coat section, protecting the optical fibers from burn-out.

Fiber component and laser device

A laser welding apparatus includes laser generator, arc generator, wire feeder, filler feeder, filler-feeding-abnormality detector, and controller. Controller stops welding immediately upon receiving a filler-feeding-abnormality signal from filler-feeding-abnormality detector. This can stop welding before the formation of a defective weld bead, and can also prevent the breakage of the welding apparatus.

Laser welding method and laser welding apparatus

Disclosed is a method for hybrid welding in which a laser beam is applied to the welding position of objects to be welded, and at the same time, a first wire is fed to the welding position so as to perform arc welding using an arc generated between the objects to be welded and the first wire. In this method, one or more second wires are fed to a molten weld pool formed by the laser beam and arc welding, thereby increasing the amount of welding without increasing the arc current.

Hybrid welding method and hybrid welding apparatus

The optical fiber of the present invention has an input double-clad fiber containing high-reflection FBG, an oscillation double-clad fiber, and an output double-clad fiber containing low-reflection FBG. The output double-clad fiber is formed of a core, a first clad, and a second clad. In the output double-clad fiber, a high refractive-index resin coat section recoated with high refractive-index resin whose refractive index is the same as that of the second clad or greater is disposed at a part where the second clad is partly removed between an output end and the low-reflection FBG. The refractive index of the high refractive-index resin coat section gradually increases along the direction in which light travels through the first clad.

Fiber laser

A first laser beam is radiated to a first radiation position of a welding object while intersecting a wire, and a second laser beam is radiated to a second radiation position that is spaced a predetermined distance from a target position of the wire. Arc welding is performed between the wire and the welding object while radiating the first laser beam and the second laser beam such that the first radiation position, the second radiation position, and the target position are disposed on a welding line of the welding object. In this way, it is possible to prevent the generation of spatter and perform welding at a high rate, without increasing the size of a molten pool.

Growing community of inventors

Osaka, Japan

Hitoshi Nishimura