Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Junji Fujiwara

Atsuhiro Kawamoto

Yasushi Mukai

Masaru Kowa

Katsumi Kozu

Noriyuki Matsuoka

Tatsuyuki Nakagawa

Akira Nakagawa

Kaito Matsui

Yuya Furuyama

Toshiyuki Mishima

Shigeki Yonemori

Hitoshi Nishimura

Toru Sakai

Yukinori Hirota

Takahiro Noguchi

Wataru Takahashi

Tatsuya Ikeda

Michio Sakurai

Kimiya Sato

Haruki Egawa

Shun Satou

Matsuoka Noriyuki

Takashi Takemura

Kajiwara Shigeru

Ryoichi Kaiwa

Tetsuo Hirabayashi

Shoji Konishi

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

Forward feeding for feeding a welding wire in a direction of a workpiece and backward feeding for feeding in an opposite direction to the forward feeding are alternately performed, and the welding wire is fed at a wire feeding speed cyclically changed in a predetermined cycle and at a predetermined amplitude to perform welding by repeating an arc period and a short-circuit period. Provided during forward feeding, stopping feeding of the welding wire from a time of an elapse of a half cycle of a change of the wire feeding speed to an elapse of a first feeding stop period, and feeding the welding wire forward at a first feeding speed from an elapse of the first feeding stop period to an elapse of a predetermined period. The welding wire is fed backward after the elapse of the predetermined period.

Arc welding control method

Disclosed is an arc welding control method of controlling a welding current in short-circuit arc welding of feeding a welding wire toward a base metal and alternating a short-circuit state and an arc state. The arc welding control method includes: executing, in the short-circuit state, a first increase in the welding current with a first slope, a first decrease in the welding current to a first bottom value after executing the first increase, a second increase in the welding current with a second slope after executing the first decrease, and a second decrease in the welding current to a second bottom value that is smaller than the first bottom value after executing the second increase to shift a state to the arc state.

Arc welding control method and arc welding device

An arc welding control method is for performing control in an arc period. The control includes: (i) increasing a welding current to a first current value at a first gradient and maintaining the welding current at the first current value for a first period; (ii) reducing the welding current from the first current value to a second current value at a second gradient and maintaining the welding current at the second current value for a second period; (iii) increasing the welding current from the second current value to a third current value at a third gradient; and (iv) starting to reduce the welding current from the third current value within a third period, which is shorter than the first period, after the welding current reaches the third current value.

Second member () includes a material that is difficult to weld to first member (). First member () is provided with first penetrating part () penetrating in a thickness direction. Third member () is arc-welded to an inner peripheral surface of first penetrating part () and opening surface () of first member () via second penetrating part () of second member (). Second member () is compressed by flange () and first member () by solidification contraction of third member (), and second member () is therefore fixed between flange () of third member () and first member ().

Junction structure

A pulse welding period alternately includes a first peak period in which a first peak current whose peak value is a first current value is caused to flow through a welding wire and a base period in which a base current having a second current value is caused to flow through the welding wire. During the base period, a second peak current whose peak current value is a sum of a second current value and a third current value and is smaller than the first current value is superimposed on the base current at a second pulse frequency. A second peak period in which the second peak current is caused to flow once is shorter than the first peak period. During the first peak period, a droplet is transferred from the welding wire toward a base material.

Arc welding control method with imposed currents

A second member has a through-portion penetrating toward a first member. An overlapped surface of the second member with the first member includes a recess. The recess is recessed so as to surround an entire periphery of the through-portion. A sealing material is injected into the recess from an injection hole to close a gap between overlapped surfaces of the first member and the second member.

Joining structure and joining method

A pulse welding period includes a first peak period for supplying a first peak current to a welding wire, a first base period for supplying a base current smaller than the first peak current to the welding wire, a second peak period for supplying a second peak current to the welding wire after alternately repeating the first peak period and the first base period (n−1) times (n is an integer equal to or larger than 2), and a second base period for supplying the base current to the welding wire. The second peak current is larger than the first peak current, and droplets are transferred from the welding wire during the second peak period or the second base period.

Arc-welding control method

A laser welding device is configured to switch an irradiation position of a measurement beam between a position of a keyhole coaxial with the optical axis of a laser beam and a position of a weld bead behind the center of an optical axis of the laser beam in a welding direction. The laser welding device determines whether there is a gap between an upper metal plate and a lower metal plate based on a measured value of a recess depth measured at the position of the weld bead.

Laser welding device

A first member and a second member are formed of metal materials of the same type and a third member is formed of a material of a different type that is difficult to weld to the first member and the second member. The first member and the second member are laser welded to each other such that respective regions of the first member and the second member which correspond to the spacer are welded via a through hole with the third member interposed therebetween. The spacer is formed of a filler material jointed to the second member by arc welding and is formed such that a central portion protrudes toward the first member more than an outer peripheral portion.

Second memberincludes a material that is difficult to weld to first member. In first member, recessis formed by press molding such that a lower surface of first memberopposite to second memberprotrudes. Third memberis arc-welded toward at least a bottom of recessvia penetrating partof second member. Second memberis compressed by flangeand first memberby solidification contraction of third member, and second memberis therefore fixed between flangeof third memberand first member

Joining structure

A welding tip includes a tip body having a wire insertion bore along a central axis and a leaf spring configured to press a welding wire onto a feeding point disposed on an inner surface of the wire insertion bore. The tip bodyhas an aperture on an outer circumferential surface on the distal end side. The leaf spring has a first end that is a free end disposed on the distal end side of the tip body and a second end fixed to the tip body. The aperture includes a first aperture accommodating the leaf spring and second apertures disposed in communication with the first aperture and configured to discharge wear particles created during welding to the outside.

Welding tip

A pulse arc welding device is controlled so as to alternately repeat a peak current period in which a welding current is a peak current and a base current period in which the welding current is a base current smaller than the peak current, feed a welding wire to an object at a feeding speed while the welding current flows through the welding wire, generate an arc between the welding wire and the object, and weld the object. So as to keep an arc length of the arc to be constant, in the base current period, the feeding speed is set to a first feeding speed and, in the peak current period, the feeding speed is set to a second feeding speed which is larger than the first feeding speed and corresponds to the first feeding speed. By this method, good welding quality with reduced spattering and suppressed undercut can be obtained.

Pulsed arc welding control method and pulsed arc welding device

A first member and a second member are formed of metal materials of the same type and a third member is formed of a material of a different type that is difficult to weld to the first member and the second member. The first member and the second member are welded to each other via a through hole with the third member interposed therebetween in a region corresponding to a first protrusion. For the first member and the third member, and the second member and the third member, each of respective outer peripheral portions of an overlapping portion of the first member and the third member and an overlapping portion of and the second member and the third member is welded.

A joint structure includes a first material (), a second material () weldable to the first material, and a third material () at least a portion of which being sandwiched between the first material and the second material, having a through opening portion at the sandwiched portion, and including a material that is difficult to be welded to both the first material and the second material, the first material and the second material welded the via through opening portion. At least one of the first material and the second material is provided with a protrusion () inserted in the through opening portion. A first gap () is provided between an inner peripheral surface of the through opening portion and the protrusion. A second gap () is provided between the first material and the second material, the second gap having a size depending on a plate thickness of the first material in a region corresponding to the protrusion. Under a condition in which the second gap has a size of greater than or equal to 0.1 mm but less than or equal to 40% of the plate thickness of the first material in the region, the first material and the second material are welded by emitting a laser beam from a side on which the first material is disposed.

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Osaka, Japan

Junji Fujiwara