120results about "Rectilinear seam welding" patented technology

A seam welding machine includes a first roller electrode and a second roller electrode that hold a layered body formed by layering a plurality of workpieces. The first roller electrode is in contact with a thinnest workpiece, which is disposed on an outermost side of the layered body. The seam welding machine has a current-branching electrode held in contact with the thinnest workpiece, and which is charged with a polarity opposite to that of the first roller electrode. Accordingly, when an electric current is applied between the first roller electrode and the second roller electrode that hold the layered body, a branch electric current is applied from the first roller electrode to the current-branching electrode, or a branch electric current is applied from the current-branching electrode to the first roller electrode.

A pair of upper and lower pressure rollers 3, 4 is disposed so that their axes 15, 16 are tilted in a horizontal plane in respective directions opposite to each other with respect to a straight line perpendicular to a welding line of a joint portion J. The pressure rollers 3, 4 are positively driven by corresponding electric motors 63, 64 to thereby roll the joint portion. Thus, steps defined at the joint portion can be smoothed and a step gradient can be reduced to ensure a high degree of joint strength.

The invention relates to a tailor-welded blank roll bending formation device and a method thereof, belonging to the roll bending formation technology and equipment field. The tailor-welded blank rollbending formation device comprises before-welding upper and lower locating rollers, before-welding left and right locating rollers, after-welding welding device, after-welding left and right locatingrollers, after-welding upper and lower locating rollers and a formation roller bank. By adopting the device, two or more than blanks with different thickness, performance, material and surface coatingare welded together by the before-welding upper and lower locating rollers, the before-welding left and right locating rollers and the welding device, and then carry out roller bending formation through the after-welding left and right locating rollers, after-welding upper and lower locating rollers and the formation roller bank. Compared with the existing punching technology, the device can continuously produce tailor-welded blanks with any cross section in a high-efficiency and high-quality way.

A welding system having welder with an electrode for creating a weld. The welding system may include a sensor for monitoring the weld. A method of monitoring a weld is also provided.

A method of additive manufacturing, including resistance welding together contacting surfaces of adjacent substrate sheets, wherein weld nuggets overlap adjacent weld nuggets and collectively form a respective layer that bonds a portion of an entirety of an area of the respective contacting surfaces, thereby forming an assembled structure of at least three substrate sheets, wherein each substrate sheet includes a respective portion of a final structure.

A method of obtaining a high-strength bonded body between composite materials, each containing a thermoplastic resin and carbon fibers, with a low current in a short period of time, wherein the bonded body is rarely susceptible to deformation such as warp.

The method of manufacturing a bonded body, comprises the steps of:

• (i) preparing a plurality of composite materials, each containing a thermoplastic resin and discontinuous carbon fibers which are randomly oriented;
• (ii) overlapping the composite materials each other;
• (iii) sandwiching at least a part of the overlapped portion between a pair of electrodes; and
• (iv) applying electricity between the electrodes to weld together the thermoplastic resins with Joule heat.

A method for weldbonding together metal sheets includes applying adhesive on the surface of a first sheet and placing a second sheet atop the first sheet. The sheets are heated at a selected location to a high temperature forming a metallic weld nugget between the first sheet and the second sheet. The adhesive may be a heat curable adhesive that is cured by the heat, or the adhesive may be heated at ambient temperatures. One or both of the sheets is then cooled in the area surrounding the selected location of heating so that the high temperature needed to created the metallic weld nugget is prevented from transferring so far beyond the selected location as to overheat the adhesive layer and thereby degrade the quality of the adhesive bond.

In the field of manufacturing container bodies by means of resistance seam welding machines, at least a disturbance variable is collected, particularly errors in cutting the metal sheet. Because of this collection of disturbance variables, at least a control variable is automatically changed in order to compensate or to diminish the influence of the disturbance variable on the welding seam quality.

It is an object of the present invention to provide a seam welding warpage prevention method and apparatus capable of preventing warpage caused by cooling contraction after welding, in a case where workpieces are different from one another in material and thickness, and thus not uniform in thermal contraction. In the seam welding warpage prevention method for welding a plurality of workpieces W1 and W2 that are not uniform in thermal contraction with respect to an energizing direction, the workpieces W1 and W2 are clamped with a pair of roller electrodes 23 and 33 while applying current. The welding is performed in a state where the roller electrode 33 that abuts on the workpiece W2 having higher thermal contraction is offset in an advancing direction ahead of the roller electrode 23 that abuts on the workpiece W1 having lower thermal contraction.

A pair of upper and lower electrode wheels 1, 2 are disposed so that their axes 17, 18 are tilted in a horizontal plane in respective directions opposite to each other with respect to a straight line Y perpendicular to a welding line X defined on overlapping portions (L) of two metal plates 5, 6, and mash seam welding is performed while positively driving electric motors 61, 62. This can reduce the increased amount of thickness and step gradient of a joint portion to reduce a stress concentration factor and ensure joint strength. The metal plates are joined to each other such that a nugget N is not deviated from a joint interface. Therefore, it is possible to prevent respective ends of the metal plates at the overlapping portions L from biting into and scratching the corresponding electrode wheels 1, 2 and to prevent spattering during the welding.

A method of manufacturing an electronic device in which an inner space for housing a gyro element is formed between a base and a lid and the base and the lid are bonded includes bonding the base and the lid in which a groove is provided on a surface to be bonded with the base so that the inner space communicates with the outside by not bonding the inner surface of the groove to the base and to position the groove around a concave portion provided on a side surface of the base, and closing a communication portion by irradiating a laser beam to the lid in the communication portion.

The invention discloses an electric resistance welding method, an electrode welding head using the electric resistance welding method and the electrode welding head used in the electric resistance welding method. The electric resistance welding method includes the steps that welding parts to be welded are connected together in a lap joint and a vertically intersected overlaying or overlapping mode, then two electrodes are pressed on a welding part on the top layer in advance in the same direction to form a current loop, pressurizing pieces are arranged between the two electrodes and on the same side as the electrodes, wherein the pressurizing pieces are parallel to the electrodes and can vertically move to press the welding part on the top layer, and in the process of welding, the electric resistance welding method includes the following steps that (1) a power supply of a welding machine is switched on, (2) current generates resistance heat in the welding part on the top layer, and the welding part on the top layer is heated to a fusion or plastic state, (3) the pressurizing pieces pressurize the welding part on the top layer, (4) cooling crystallization is conducted, (5) pressure of the pressurizing pieces and the two electrodes is released, and then the welding parts are taken out. By the adoption of the electric resistance welding method, any metal wire or wire or wire piece or piece in a lap joint state can be welded, the electric resistance welding method is especially used for welding IC card chips and induction coils of the IC card chips and directly welding battery electrodes and copper pieces or copper wires in battery sets and can achieve the good effect.

The present invention provides a seam welding robot including a robot arm and a welding unit that is coupled to the robot arm. The welding unit includes a pair of roller electrodes. The pair of roller electrodes rotates following motion of the robot arm while sandwiching and pressurizing welding targets. The welding unit passes a welding electric current between the pair of roller electrodes to seam-weld the welding targets.

A second joint flange (42a) formed along an edge of a second panel (42) and a third joint flange (43a) formed along an edge of a third panel (43) are each superposed on a first joint flange (41a) formed along an edge of a first panel (41), a portion in which the first joint flange (41a) and the second joint flange (42a) are superposed in two layers, and a portion in which the first joint flange (41a) and the third joint flange (43a) are superposed in two layers are subjected to seam welding (Wa), and a portion in which the first joint flange (41a), the second joint flange (42a) and the third joint flange (43a) are superposed in three layers is subjected to spot welding (Wb). The welding speed is increased by subjecting the two-layered portion with a long weld length to seam welding (Wa), and peel strength can be increased by subjecting, to spot welding (Wb), the three-layered portion that is difficult to subject to seam welding (Wa) and easy to peel off because the number of superposed layers is large.

A tailor-welded blank is formed by resistance mash seam welding an overlapped metallic sheet and a laminated steel structure that has a viscoelastic layer sandwiched between steel layers. Preferably, assuming the metallic sheet is approximately 1.3 millimeters (mm) thick and the laminated steel structure is approximately 1.15 millimeters (mm) thick, the weld speed is approximately 7 meters per minute (mpm), the weld pressure is approximately 0.3 millipascals (mPa) and the weld current is approximately 30.3 kiloamps (kA). The tailor-welded blank may be stamped to form an automotive component

A process is provided for scam welding advanced high strength steel sheets together. Respective end portions of first and second advanced high strength steel sheets are placed in overlapping contact with one another, and subjected to first and second weld passes. In the first weld pass, a seam welder including weld electrodes operate at a first-pass applied current and a first-pass pressure and are moved relative to the overlapping end portions at a first-pass carriage speed to establish a weld seam containing a weld nugget with a martensite phase. In the second weld pass, the weld electrodes operate at a second-pass applied current and a second-pass pressure and move relative to the weld seam at a second-pass carriage speed selected to fuse microcracks, lap openings, and porosity in the seam, relieve the residual stress in the joint, and temper the martensite phase of the weld nugget, and thereby form a weld joint.