195results about "Welding electric supplies" patented technology

Provided is a method of resistance spot welding of welding a sheet set including a high strength steel sheet with which a high joint strength can be achieved even for a high Ceq material. A method of resistance spot welding a sheet set of two or more lapped steel sheets by weld the sheet set while clamping and pressing the sheet set between a pair of welding electrodes includes a first welding step of applying an weld current Im (kA) and forming a nugget having a nugget diameter d (mm) that satisfies the following inequality (1); a cooling step, subsequent to the foregoing first welding, of cooling the sheet set while continuing to press the sheet set; and a second welding step of performing two-step welding,

3×√t_m≦d≦6×√t_m  (1),

where t_m is the thickness (mm) of the thinnest one of the foregoing two or more steel sheets.

A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.

A resistance spot welding method including: a pulsation process of clamping a sheet assembly of two or more overlapped steel sheets including at least one high tensile steel sheet using a pair of welding electrodes that are connected to a spot welding power source employing an inverter direct current method, and performing plural repetitions of current passing and current pass stopping, while pressing the steel sheets with the welding electrodes; and a continuous current pass process in which, after the pulsation process, current is passed continuously for a longer period of time than a maximum current pass time of the pulsation process, while pressing the steel sheets with the welding electrodes.

A phase reference generator for use in a resistance weld control. The phase reference generator including a digital signal processor having a digital volt-time area generator to generate a volt-time area of an observed voltage; a digital current-time area and current-difference-time area generator to generate a current-time area of an observed current and a current-difference-time area of the observed current; a line impedance estimator; and, a driving point voltage area estimator configured to receive values from the digital volt-time area generator, the digital current-time area generator and current-difference-time area generator, and the line impedance estimator and generate estimates of the driving point voltage.

The objective of the invention is to provide a resistance spot welding method with which a nugget having a suitable diameter can be obtained even under special welding conditions, without increasing the energization time and without the generation of expulsions. The invention is a resistance spot welding method in which an energization pattern is divided into multi-stage steps having two or more stages, and in which test welding and main welding are performed. In the test welding, the energization is performed using a constant current that has a different current value for each step, and the time variation of the instantaneous amount of heat generated per unit volume, and the accumulated amount of heat generated per unit volume are stored as target values. In the main welding, if the amount of time variation of the instantaneous amount of heat generated per unit volume deviates from the results of the test welding during any step, the amount of energization is controlled in such a way that the difference is compensated for during the remaining energization time in said step. The configuration is such that in the test welding, if the energization current in a first step is Ia and the energization current in second and subsequent steps is Ix, the relationship 0.3 x Ix<= Ia <Ix is satisfied.

A joining device for connecting a metal member and a resign member with a metal fastener including a penetrating tip comprises: a cylindrical nosepiece; a high frequency electromagnetic induction coil around the nosepiece; an electrode punch for pressing the fastener into the resign member; a electronic chopper for producing a high frequency current; a high frequency power supply for supplying an induction current to the induction coil; a welding power supply for supplying a welding current between the electrode punch and the metal member; a contact detector for sensing when the fastener tip touches the metal member; and a switching unit for automatically switching from the induction current to the welding current when the contact detector senses that the tip has contacted the metal member.

A welding system that can shorten the length of connecting wires and make efficient use of equipment as a whole. The system comprises: a welding controller (3) equipped with an I/O interface (6); equipped with a programmable logic controller (2) and connected to the welding controller (3) through a field bus interface (7) as a communication device ) on the I/O interface (6) of the controller (1); the welding machine (4) and general peripheral equipment (5), wherein the welding controller (3) communicates from the programmable logic controller through the field bus interface (7) (2) Receive instructions to control the welding machine (4) and general peripheral equipment (5).

An economical capacitor-type welding device and capacitor-type welding method that have a small power loss, that can be made compact, and that reliably control a charging circuit without being affected by the inductance of a charging path. In an exemplary capacitor-type welding device and an exemplary capacitor-type welding method of the invention, a bypass switching element having a forward-blocking function is connected in parallel to output terminals of a charging circuit, and the bypass switching element is brought into a conduction state to allow a backflow current, which is caused to flow by a magnetic energy stored in the inductance of a primary winding or an inductor included in the charging path, to bypass the charging circuit. A discharge switching element is brought into a conduction state after the bypass switching element enters the non-conduction state and recovers the forward-blocking function.

A linear DC welder for enhanced welding capabilities comprises one or more active filtering circuits. The active filtering circuit(s) are capable of producing a variety of user-configurable and user-controllable custom waveforms for use in various welding applications. The custom waveforms may be created and combined via the use of overlay waveforms and, in at least some preferred embodiments of the present invention, include agitation waveforms. The overall operation of the welder, including the power supply and the active filtering circuit can be controlled via an integrated feedback cycle that provides for the monitoring and adjustment of multiple weld process parameters including volts, amps, power, resistance, and displacement. Additionally, a low current ignition (“LCI”) circuit may also be included to provide for additional welding options.

A method of resistance spot welding steel workpieces—at least one of which includes a high-strength steel substrate having a tensile strength of 1000 MPa or greater—involves passing a pulsating DC electrical current between a pair of aligned welding electrodes that are pressed against opposite sides of a workpiece stack-up that includes the steel workpieces. The pulsating DC electrical current delivers sufficient power through the weld site by way of electrical current pulses to initiate and grow a molten steel weld pool at each faying interface within the workpiece stack-up that solidifies into a weld nugget of uniform hardness. In other words, each of the weld nuggets formed by the pulsating DC electrical current does not include soft, coarse, and alloy deficient shell regions that tend to reduce the strength of the weld nugget.

An apparatus for resistance welding with a welding system has an energy supply system, a welding convertor, a welding process control, a servowelding tong, a servotong control, wherein the welding convertor, the welding process control, the energy supply system and the servotong control form a structural unit.

A manual intermediate frequency resistance welding control cabinet comprises a power circuit part and a control circuit part. The power circuit part comprises a three-phase alternating current supply, a three-phase full-bridge rectifying circuit, a filter circuit, an inverter circuit, an intermediate frequency transformer, a one-valve output protection circuit and an output electrode, wherein the three-phase alternating current supply, the three-phase full-bridge rectifying circuit, the filter circuit, the inverter circuit, the intermediate frequency transformer, the one-valve output protection circuit and the output electrode are sequentially connected. The control circuit part comprises a central processing unit, a clock circuit and a sensor circuit. The sensor circuit comprises a primary current sensor and a secondary current sensor, the primary current sensor is coupled to the output end of the inverter circuit and connected with the central processing unit after A/D conversion, the secondary current sensor is coupled to the output end of the one-way output protection circuit and connected with the central processing unit after A/D conversion, and the control port of the central processing unit and the control end of the inverter circuit are connected. By the adoption of the manual intermediate frequency resistance welding control cabinet, welding quality and welding efficiency are both obviously improved, meanwhile, intermediate frequency welding power factors are high, and compared with traditional alternating current welding, power consumption is small, and pollution is low.

The invention discloses an improved bus bar welding machine head. The improved bus bar welding machine head comprises an anode main supporting plate, welding assemblies, connecting assemblies, liftingassemblies and an electrode copper plate assembly, wherein each welding assembly is movably fixed to the front plate surface of the anode main supporting plate in a liftable manner through one connecting assembly and one lifting assembly; and the electrode copper plate assembly provides a welding current for the welding assemblies. According to the invention, the improved bus bar welding machinehead comprises the multiple welding assemblies, each welding assembly comprises a plurality of welding heads, and welding efficiency is greatly improved; the positive and negative welding heads adoptup-down alignment welding, the welding heads and welding bars are in continuous long-line contact, the situation that the welding heads and the welding bars are in poor contact as the welding bars aretoo short is avoided, and welding quality is guaranteed; and the positions of the welding heads in the welding machine head can be changed, so that the welding machine head can adapt to welding of bur bars of various specifications, lifting operation of the welding assemblies in welding operation can be independently controlled by the lifting assembles, and welding flexibility is further improved.

The invention relates to a power supply device, in particular to a power supply device of a mobile flash rail welding machine, and solves the defects and problems of an existing movable flash rail welding machine by adopting a diesel generator set as a power supply device. The power supply device comprises a storage battery pack, a super capacitor bank, a bidirectional DC/DC converter and a welding main inverter, the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery bank is connected with the input end of the welding main inverter through an isolation switch KM2, and the output end of the welding main inverter supplies power to the movable flash rail welding machine. The device avoids the oil fume pollution and is particularly suitable for welding underground rails, such as subways, etc., enables the economic benefits of users to be improved, generates noise hardly, and enables the service life to be prolonged and the maintenance cost to be reduced.