7results about "Pressure electrodes" patented technology

A spot-welded joint has a first workpiece (1), a second workpiece (2), and a weld nugget used for fixedly connecting the first workpiece (1) and the second workpiece (2). At least one of the outer surface of the first workpiece (1) and the outer surface of the second workpiece (2) includes a basic surface and an indentation. The indentation has a first surface located in the center and protrudes outwards and a second surface located on the periphery of the first surface and recessed inwardly. The maximum distance h1 between the first surface and the basic surface is smaller than the maximum distance h2 between the second surface and the basic surface. The edge welding of the spot-welded joint is firmer, and the center is thinner, so that the generation of surface cracks and the formation of internal defects are reduced, thereby improving the welding spot strength.

A resistance welding device welds a plurality of stacked welding target members of a workpiece by pressurizing the workpiece and supplying power to the workpiece. The resistance welding device includes at least one electrode that has a tip end surface configured to be in contact with the workpiece and that is configured to pressurize the workpiece and supply power to the workpiece. The electrode has, at an intermediate portion between the tip end surface and a base end of the electrode, at least one slit that opens to an outer circumferential surface of the electrode and that extends in a circumferential direction in a plane intersecting a central axis direction of the electrode.

A metal joined body has an iron base body and an aluminum base body that are joined together via a joint layer. The joint layer has a first layer composed of a first intermetallic compound formed on the iron base body side and a second layer composed of a second intermetallic compound formed on the aluminum base body side. The first layer has one or more first protrusions that merge integrally into the iron base body and extend in a pile shape into the first intermetallic compound. The second layer may have one or more second protrusions that are composed of a second intermetallic compound and extend in a columnar shape into the aluminum base body. The first intermetallic compound may contain Al5Fe2, and the second intermetallic compound may contain Al3Fe. The total thickness of the first layer and the second layer is, for example, 2 to 15 μm.

An electric spot-welding head (10) for a multi-axis industrial robot arm is described, comprising: - a support structure (100) comprising at least one attachment portion (127) for attaching the welding head to the multi-axis industrial robot arm; - a first electrode-holder arm (200) carrying a first welding electrode (202) and connected to said support structure; - a second electrode-holder arm (200) carrying a second welding electrode and connected to said support structure (100); and - an electric transformer (400) configured to apply an electrical voltage to said first and second welding electrodes (202, 302). The electric spot-welding head (10) is characterized in that it comprises particular connection devices (700, 800) to facilitate the electrical and hydraulic connection of the electric transformer (400).

Wiring is disclosed herein that is configured to supply IRE ablation signals through a catheter body and is resistant against dielectric breakdown, arcing, and noise during ablation. The wiring includes a highly conductive core, a conductive cover surrounding the core that has lower electrical and / or thermal conductivity than the core, and an insulative jacket surrounding the conductive cover. A catheter including such wiring may be suitable for supplying electrical signals to tissue to perform IRE ablation. In some examples, such a catheter can also be suitable for reversible electroporation and / or RF ablation.

An electrode (10) for solid-phase resistance spot joining includes a cylindrical portion (11) that extends in an axial direction, the cylindrical portion (11) being provided with one end (12) in the axial direction. The one end (12) includes a tip end surface (14) to be pressed against a workpiece (301, 302). By providing a plurality of slits (50) by cutting in the axial direction, the one end (12) is divided into a plurality of pieces aligned at an interval in a circumferential direction of the cylindrical portion (11) when viewed from a side of the tip end surface (14).

An electric spot-welding head (10) for a multi-axis industrial robot arm is described, comprising: - a support structure (100) comprising at least one attachment portion (127) for attaching the welding head to the multi-axis industrial robot arm; - a first electrode-holder arm (200) carrying a first welding electrode (202) and connected to said support structure (100); - a second electrode-holder arm (300) carrying a second welding electrode (302) and connected to said support structure (100); and - an electric transformer (400) configured to apply an electrical voltage to said first and second welding electrodes. The welding head is characterized in that it comprises specific interface modules (601, 602, 605) to facilitate the electrical and hydraulic connection of the head to the robot arm.