Class / Patent application number | Description | Number of patent applications / Date published |
219910100 | With condition responsive control of the welding process | 7 |
20090302008 | Spot Welding Method and Spot Welding System - A spot welding system and method where pressing force of a welding electrode applied by driving a servomotor is accurately controlled. The spot welding system has a pair of welding electrodes, a servomotor ( | 12-10-2009 |
20120118861 | Method and Control Device for Monitoring the Quality of Spot Welds of a Resistance Welding Gun Comprising the Outputting of a Warning Message - A method for monitoring and/or regulating the quality of spot welds of a resistance welding gun includes measuring and storing measured values during the execution of resistance spot welds at different points on a workpiece. The measured values represent a voltage, a current, a resistance, a welding time, an energy, a force on welding contacts and/or an output during the production of a resistance spot weld. The method also includes comparing the measured values with a reference measurement value. The reference measurement value represents a corresponding voltage, a current, a resistance, a welding time, an energy, a force on welding contacts and/or an output during the production of a corresponding resistance spot weld. The method also includes outputting a warning message when, during the comparison, it is established that a predetermined number of successive measured values is outside a predefined tolerance band from the reference measurement value. | 05-17-2012 |
20130186868 | SYSTEM AND METHOD FOR PERFORMING RESISTANCE SPOT WELDING - A probeless energy delivery controller for a resistance spot welding system includes a power supply module that generates a first current and a power delivery module configured to generate a second current from the first current. The current is delivered to a first electrode and a second electrode that have at least two weld pieces interposed there-between. As the current flows through the weld pieces, the resistance and temperature of the weld pieces increase such that the weld pieces weld together. The system further includes a voltage control module that receives a current reading indicating a value of the second current, estimates a resistance of the weld pieces based on the value of the second current, and determines a phase angle for setting a voltage outputted by the power supply module based on the estimated resistance and a power profile. The power supply module generates the first current based on the phase angle. | 07-25-2013 |
20130200047 | SPOT WELDING APPARATUS AND SPOT WELDING METHOD - The first embodiment of the invention is a spot welding method using a welding gun including a pair of electrodes holding and welding a welding point of a workpiece. The method including: transmitting an ultrasonic from one of the electrode pair to the workpiece with the electrode pair holding the workpiece; receiving the ultrasonic at the other electrode passed through the electrode pair and the workpiece; and detecting a holding state of the workpiece on the basis of an amplitude of the received ultrasonic. According to the embodiments of the invention, the welding gun can hold the workpiece at the proper position and with the correct angle, thereby reducing the welding flaws. | 08-08-2013 |
20130334177 | Determination of a Quality of an Aluminum Weld - A method for determining a quality of at least one aluminum weld comprises detecting a force exerted on a workpiece by at least one electrode, and determining at least one factor characterizing the quality on the basis of a comparison of the detected force with at least one reference value. An aluminum welding method, a welding device set up for a corresponding operation, a welding controller and a computer program are likewise the subject matter of the disclosure. | 12-19-2013 |
20150069026 | WELD HEAD - A weld head for spot welding two or more components together. The weld head includes first and second electrode assemblies and a linear actuator motor to drive the first electrode assembly into a desired position and apply a desired clamping force. The weld head may include a sensor configured to measure a temperature of the motor and a controller configured to monitor the temperature and adjust the current supplied to the motor to maintain the desired clamping force. The weld head may include linear encoder to measure the position of the linear actuator motor and an algorithm that correlates the position of the motor with a force constant of the motor. Based on the position of the motor and the corresponding force constant of the motor, the controller is configured to adjust the current supplied to the motor to maintain the desired clamping force. | 03-12-2015 |
20160016252 | METHOD AND APPARATUS FOR RESISTIVE SPOT WELDING - An apparatus and corresponding methods are disclosed to resistively spot weld a stack of sheet metal having a plurality of sheets of sheet metal. In one embodiment, a method includes contacting a first welding tip to a first side of the stack and contacting a second welding tip to a second side of the stack, the second side comprising a thinnest exterior sheet of the stack, the second welding tip including a contacting surface area less than the first welding tip; applying a squeeze pressure to the stack; and applying a current to the stack by applying a first current pulse for a first duration followed by applying a second current pulse for a second duration longer than the first duration and with a lower current than a current of the first current pulse. | 01-21-2016 |