Terms

The DVS bulletin sheet 2911 “Capacitor discharge welding – basics, processes and technology” describes the main features of CD welding and defines general terms and variables:

Component check Comparison of the attained actual position in relation to the target position after the application of the moving electrode to the joining parts and completion of the force generation prior to welding. If the actual/target difference lies outside the adjustable limit value, an error message is generated and welding is prevented.
Yield path
sI/mm
Path of the moving electrode during the current flow and the hold time (until electrode standstill). This value can be monitored.
Electrode force FS/kN Contact pressure with which the electrodes press on the parts to be joined.
Charging voltage U0/V The voltage with which the capacitors were changed before welding. The energy fed to the transformer is determined by the capacitance and the charging voltage.
Hold time
tNH/ms
Directly follows the current flow time; during the hold time the weld point cools under the contact pressure.
Welding energy
E/kWs

The energy stored in the capacitors before welding, which is calculated per E = 0.5 C U02.

Setting path
sF/mm
Path of the electrode from the default position (electrodes open) to application to the joining parts. At the end of the setting process, the component check takes place.
Peak current IP/kA Maximum value over the time progression of the weld current, which is to be characterised as exponential surge current (one half sine wave, which is superimposed by a subsiding exponential function). Incorrectly also referred to as “welding current”.
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