Kobe Steel, Ltd.

Jfe Steel Corporation

Daihen Corporation

Kabushiki Kaisha Kobe Seiko Sho (kobe Steel, Ltd.)

Mazda Motor Corporat Ion

Reiichi Suzuki

Kei Yamazaki

Minoru Miyata

Kenichi Watanabe

Takayuki Kimura

Shun Izutani

Tokuji Maruyama

Liang Chen

Yu Umehara

Masao Hadano

Naoki Mukai

Yimin Yuan

Naoki Kawabe

Ryu Kasai

Hiroshi Matsuda

Rinsei Ikeda

Yuji Ueda

Satoru Ando

Masaaki Tanaka

Masao Kinefuchi

Tetsuo Soshiroda

Toshiro Uezono

Kazuki Nakamura

Mitsugi Fukahori

Sachiko Suzuki

Kazuya Yasui

Hideto Katsuma

Eri Yamamoto

Dongyong Shi

Toshihiko Nakano

Kyohei Maeda

Keiichiro Yanagi

Takashi Ogawa

Provided is a manufacturing method for a joint body having a blank material plated with a metal material and a hoop material plated with a metal material joined together by placing the hoop material on the blank material and causing a laser oscillation system to irradiate a surface of the hoop material with laser light to form a joint portion including a line-shaped welded portion where the blank material and the hoop material are joined together. In this manufacturing method, the hoop material is supplied to be placed on the blank material and form a predetermined gap d between the blank material and the hoop material, and the hoop material is irradiated with a laser at a position where the predetermined gap d is located between the blank material and the hoop material to join the blank material and the hoop material together by laser welding.

Manufacturing method and manufacturing apparatus for joint body

This coupling device for a tubular member is provided with: a base stand for holding an inner member and an outer member in a state in which the outer member is disposed around the inner member; a plurality of pressing members that are supported by the base stand in a movable manner in the radial direction of the inner member and the outer member and have a protruding part on the tip thereof; a pressing member that make contact with the final end of the pressing member and that can press the pressing member radially inward; and a drive mechanism that drives any one among the base stand and the pressing member in a direction perpendicular to the movement direction of the pressing member so that the one member moves relative to the other. The inner member and the outer member are caulked and coupled by driving, by the drive mechanism, any one among the base stand and the pressing member and displacing the pressing member radially inward to thereby expand, radially inward, a portion of a peripheral wall of the outer member by the protruding part.

Coupling device for tubular member, different-material joining method using same, and manufacturing method for tubular member equipped with different-material-joining auxiliary member

A gas-shielded arc welding method includes welding a steel plate having a tensile strength of 780 MPa or more while feeding a consumable electrode via a welding torch and flowing a shielding gas. The consumable electrode includes, in mass %, C: 0 to 0.20%, Si: 0 to 0.50%, Mn: 0 to 0.50%, Cr: 1.00% to 9.00%, S: 0.0020% to 0.0600%, and Ni: 0 to 0.50%. The shielding gas includes, in vol. %, at least one of COand O: 1% to 15% in total, with the remainder being Ar and unavoidable impurities. Welding is performed under the condition satisfying the relationship of 1≤{−0.05×[CO+O]}+[Cr]≤8.3, and [Cr] represents the content of Cr in the consumable electrode, and [CO+O] represents a total content of at least one of COand Oin the shielding gas.

Gas-shielded arc welding method and method for manufacturing welded structure

A joint structure, includes: a first member including a high tensile strength steel; a second member including a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed; a molten-solidified portion formed by melting and solidifying the first member and the second member; and a heat affected zone formed around the molten-solidified portion, in which the surface soft layer has a total thickness of 5 μm to 200 μm, and the molten-solidified portion has a carbon amount of 0.21 mass % or more, and a maximum Vickers hardness of the surface soft layer in the heat affected zone is 100 Hv to 500 Hv.

Joined structure and method for manufacturing joined structure

The present invention relates to a method for joining a plated steel sheet, in which at least one of a first steel sheet and a second steel sheet is a plated steel sheet, and the first and second steel sheets overlapped with each other are subjected to an arc spot welding. The method includes press-working the first steel sheet into a desired shape and at the same time forming a linear groove on an overlapping surface with the second steel sheet of the first steel sheet, overlapping the first and second steel sheets, and setting a welding torch with the groove as a target position, and performing the arc spot welding so as to overlap the groove when viewed from a direction perpendicular to the overlapping surface.

Method for joining plated steel sheet and joint structure

A joint body includes first and second metal members and a joint portion including a welded portion where the first and second metal members are joined together, the welded portion having a line shape. The joint portion includes first and second longitudinal portions and a plurality of connecting portions. The first longitudinal portion has first intersecting portions arranged in a first direction and extends in the first direction. The second longitudinal portion has second intersecting portions arranged in the first direction and extends in the first direction. The welded portion intersects itself at the first and second intersecting portions. The connecting portions are arranged in the first direction. The connecting portions extend in a first direction and connect the first and second longitudinal portions.

Joint body, manufacturing method for joint body, and manufacturing apparatus for joint body

A welding system includes a welding torch that welds a workpiece by using a wire, a suction device that sucks shielding gas, and a sucked shielding gas supply path for allowing the sucked shielding gas to flow, wherein the welding torch includes a contact chip that guides the wire, a shielding gas supply nozzle that supplies the shielding gas to a weld zone, and a suction nozzle that surrounds a periphery of the wire protruding from the contact chip, and is opened toward a tip of the wire to suck the shielding gas.

Welding device and welding method

A welding torch for arc welding in a shielding gas atmosphere, includes: a contact tip for feeding a welding wire; a suction nozzle surrounding the welding wire, and sucking a gas from a space between the suction nozzle and the welding wire; and a shielding gas supply nozzle provided on the outer periphery of the suction nozzle, and supplying the shielding gas toward a welded portion from a space between the shielding gas supply nozzle and the suction nozzle. The welding torch satisfies '7&#x2264;Ltk&#x2264;17 and 0&#x2264;Lts&#x2264;18', where Lts [mm] is a distance between the tip of the contact tip and the tip of the shielding gas supply nozzle, and Ltk [mm] is a distance between the tip of the contact tip and the tip of the suction nozzle.

Welding torch

A manufacturing method for a joint body having a first metal member and a second metal member joined together by causing a laser oscillation system to irradiate a surface of the second metal member placed on the first metal member with laser light to form a joint portion including a welded portion where the first metal member and the second metal member are joined together includes continuously supplying the second metal member while pressing the second metal member against the first metal member, the second metal member being a hoop material, and causing the laser oscillation system to emit the laser light.

Manufacturing method for joint body and manufacturing apparatus for joint body

In this flux-cored wire, the contents of F, Li, acid-soluble Al, Mg, S, CO, Ba, Ca, Sr, REM, P, C which is not derived from a carbonate, Mn, Ni, and Cu are set to fall within prescribed ranges with respect to the total mass of the wire, and the blending ratio among these components is set to fall within a particular range.

Flux-cored wire

A steel plate frame and a thin plate are made of different materials. A plurality of through holes are formed in a portion of the thin plate to be placed on the steel plate frame. A plurality of projectionsare formed on a support plate, each of the projections being allowed to be inserted into a corresponding one of the through holes. An adhesive is applied to a portion of the steel plate frame on which the thin plate is placed. The thin plate is placed on the steel plate frame, and the steel plate frame and the thin plate are bonded together by the adhesive. The support plate is placed on the thin plate to insert the projections into the through holes. The projections and the steel plate frame are welded to form a plurality of welded spots.

Method for joining dissimilar materials, and dissimilar-material joined body

Provided is a welding method using a special torch and a flux cored wire, in which the special torch has a suction nozzle between the contact tip and the shield nozzle, and the flux cored wire has a flux filled inside the steel outer casing, and a seam portion where both ends of a metal in a width direction of the steel outer casing are butted or overlapped in a longitudinal direction of the flux cored wire.

Welding method using special torch

A gas-shielded arc welding method includes feeding a consumable electrode via a welding torch and performing welding while flowing a shielding gas. The welding torch includes a nozzle. An inner diameter of the nozzle is 15 mm or more. A nozzle-base material distance between a tip of the nozzle and a material to be welded is 22 mm or less. A ratio expressed by (the inner diameter of the nozzle/the nozzle-base material distance) is 0.7 or more and 1.9 or less.

Gas-shielded arc welding method

The purpose of the present invention is to provide a flux cored wire which has good high-temperature cracking resistance, and which enables the achievement of a welded part exhibiting excellent coating adhesion. The present invention relates to a metal flux cored wire for gas-shielded are welding, which contains, relative to the total mass of the wire, 0.02-0.30% by mass of C, 0.3-1.5% by mass of Si, 0.3-2.5% by mass of Mn, and oxide of at least one element selected from the group consisting of Si, Cr and Ni in an amount of 0.01-0.30% by mass in total, 0.020% by mass or less of S, and 0.3% by mass or less of Al, Ca, Mg, K and Na in total in the form of metals or alloys, with the balance made up of Fe and unavoidable impurities.

Flux-cored wire for gas-shielded arc welding and welding method

A method for welding a galvanized steel sheet includes utilizing a pulse welding of repeatedly applying a pulse peak current and a base current, setting a welding speed to 100 cm/min or less, and using a shielding gas in which 1 vol % or more and 10 vol % or less of at least either one of COand Ois added to Ar. The pulse peak current has a pulse peak time being in a range of 7% or more and less than 50% of one period depending on a sheet thickness of the galvanized steel sheet.

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Fujisawa, Japan

Reiichi Suzuki