TH58623C3 - Resistance based spot welding system - Google Patents

Abstract

Resistance based spot welding systems include A computational unit that calculates and stores the time variation in the instantaneous quantity of heat generated, calculated from the property. Electrically between the electrodes during the test weld forming a suitable nugget by passing Current with constant current control A division unit that divides the current pattern based on the It changes over time of the moment quantity of heat generated into a computational step by Corresponds to the input from an external source After test welding And keep the variation over time Of the moment quantity of heat And the cumulative amount of heat generated for each The steps are target values. And an adaptive control unit that initiates the welding on the actual welding after Then, by using the time-shift curve of the resulting heat quantity, Keep it as a target value as a standard. And adjust the welding voltage and current during welding When the time change over the moment quantity of heat generated is deflected in During any procedure From the time-shift curve with a difference To compensate for the difference in During the remaining welding time And the cumulative amount of heat generated to match the amount Accumulation of the generated heat that is the target value of that step. This system handles tip wear. Best electrode And the existence of interference effectively And thus getting good nuggets

Claims (2)

1. The spot welding system relies on resistance to bond the material by compressing the material between the pairs. Of electrodes And transmission of current While providing pressure In which the material is a sheet of metal overlaid on one another by a composite system. Calculation units that have been created to calculate. And keep the time-based variation of the quantity Moment of the heat generated, which is calculated from the electrical properties between the electrodes in During the test welding before the actual welding. That forms a suitable nugget by passing the current by Constant current control The division unit was created to divide the current pattern on the basis of variation. By the time of the instantaneous amount of heat that produces a number of steps in accordance with the Sent from an external source After test welding And keep the time-based variation of the quantity A moment of heat And the cumulative amount of heat generated for each step is the target value and an adaptive control unit has been established to initiate the weld on the actual post weld. Then, by using the time-shift curve of the resulting heat quantity, Keep it as a target value as a standard. And adjust the welding voltage and current during welding When the time variation quantity of the moment quantity of heat generated is deflected in During any procedure From the time shift curve with a difference To compensate for the difference in During the remaining welding time at that stage And to generate a certain amount of heat that produces And the accumulated amount of heat generated to match the accumulated amount of heat generated. Birth that is the target value of that step 2. Clause 1 system of claim that is also included. A built-in electrode detects a change in force condition. Change of condition in the initial welding electrode, where the detector senses the change in force, the electrode determines the time of the force. The electrode during the test welding achieves the specified value. And send in the deadline for Divide the current pattern into a number of steps.