A different material joining method sandwiches, with electrodes, a first joining member and a second joining member lower in melting point than the first member, applies pressure and electricity to them, and joins them in preset joint parts. The method includes forming a discontinuous abutting part beforehand in the joint part of at least one of the two members. The two members abut onto the abutting part in a discontinuous state. The method includes melting the second member by sandwiching the joint parts with the electrodes and applying pressure and electricity on the joint parts in a state where the two members abut onto each other in the joint parts while the abutting part is included. The method includes welding both the members by bringing a melting material of the second member into interface joining with a surface of the first member toward the second member.

The present invention provides a robot control device and a spot welding system that are capable of roughening the surfaces of electrodes without requiring additional special devices or effort. The robot control device controls the operation of a robot that comprises a spot welding gun having a pair of electrodes positioned facing each other. The robot control device has a robot operation control unit that moves the pair of electrodes of the spot welding gun to a blade polishing position so that the surfaces of the pair of electrodes are polished by a rotating blade of an electrode polishing device. The robot control device changed the position of the pair of electrodes in contact with the blade from the polishing position so as to scratch the surfaces of the pair of electrodes after the polishing by the blade.

A spot welding quality check system, which can be easily used and can be adapted to various situations. The check system has: a pair of electrodes configured to move toward or away from each other and apply current to a workpiece while pressurizing the workpiece; a displacement detecting part which detects an amount of displacement between the electrodes during spot welding; a checking part which estimates as to whether welding quality is good or poor by using an inner function, based on the detected amount of displacement; a correction receiving part which receives a correction by an operator regarding the estimated welding quality; and a learning part which updates the inner function based on an estimation result when the correction receiving part does not receive the correction, and updates the inner function based on a content of the correction when the correction receiving part receives the correction.

An assembled battery includes: a holder having a holding hole; and an exterior tube equipped battery, wherein: the holder accommodates the exterior tube equipped battery into the holding hole; the exterior tube includes a cylindrical outer-peripheral-surface adhesion portion and a toric peripheral edge covering portion that covers a surface peripheral edge portion; and the assembled battery includes a first adhesive injected and solidified in a gap between an outer peripheral surface of that part of the exterior tube equipped battery which is placed inside the holding hole and that inner peripheral surface of the holder which constitutes a hole wall of the holding hole, and a second adhesive injected and solidified in a gap between the surface peripheral edge portion of the battery and the peripheral edge covering portion.

A packaged semiconductor device has a plurality of leads. A respective lead is to be welded to an electrical coupling that has a substantially rectangular end section. The end section has a width that is greater than a width of the respective lead. The respective lead is aligned within the width of the end section, such that the respective lead extends in a direction substantially perpendicular to the width of the end section. With the respective lead and the end section aligned, the respective lead is welded to the end section.

An apparatus and method for fastening layers of non-ferrous alloys, like aluminum, magnesium and copper utilizes a steel fastener and a spot welding machine. The fastener and metals are stacked and the heat from the welder's electric current softens the lower melting point aluminum allowing the fastener to penetrate the aluminum. A weld zone between the fastener and the various layers creates an internal weld. The fastener has a rough shaft that is coated by the molten weld zone and is hard to withdraw on solidification. Layers of non-conductive materials like plastics and ceramics may also be affixed to a conductive layer using a fastener made from a compatible material that extends through a pilot hole and welds to or penetrates a conductive layer. The fastener may have projections that initially reduce contact area with the stack.

A welding electrode and a method of using the welding electrode for resistance spot welding are disclosed. The welding electrode includes a body and a weld face. The weld face includes a central dome portion and a shoulder portion that surrounds the central dome portion and extends from an outer circumference of the weld face upwardly and radially inwardly to the central dome portion. The central dome portion has a series of radially-spaced ringed ridges that project outwardly from a base dome face surface. The series of radially-spaced ringed ridges on the central dome portion includes an innermost ringed ridge and an outermost ringed ridge. The outermost ringed ridge on the central dome portion has a radial inner side surface and a radial outer side surface. The radial outer side surface extends below the base dome face surface down to the shoulder portion of the weld face.

A resistive welding electrode includes at least a weld face constructed of a refractory-based material that exhibits an electrical conductivity that is less than or equal to 65% of the electrical conductivity of commercially pure annealed copper as defined by the International Annealed Copper Standard (IACS). A method of using the resistive welding electrode to resistance spot weld a workpiece stack-up that includes an aluminum alloy workpiece and steel workpiece that overlap and contact each other at a faying interface is also disclosed.

A welded portion forming structure forms a welded portion that joins a valve seat and a cylinder head main body. If the distance in a radial direction between a vertex of a corner, which is formed by a first surface and a second surface of the convex portion, and the first origin portion is assumed to be A, and the distance in the radial direction between the vertex and the second origin portion is assumed to be B, then a relation that satisfies all of A>0, AB, and B0 holds. Moreover, an angle which a first joint surface of the valve seat forms with an axial direction and an angle which the second joint surface forms with the axial direction are equal.

A welding electrode includes a weld face that has a convex base weld face surface and a plurality of ringed ridges that are radially spaced apart on the base weld face surface and surround a central weld face axis. The plurality of ringed ridges including an innermost ringed ridge and an outermost ringed ridge. The innermost ringed ridge is located closest to the central weld face axis and rises above a central portion of the base weld face surface, and the outermost ringed ridge is located farthest from the central weld face axis and rises above an outer peripheral portion of the base weld face surface. At least one of the plurality of ringed ridges is a discontinuous ringed ridge.