Regulation and quality assessing of welding esp. spot welding - has ultrasonic detecting probe attached to welding electrode to record noise emission level at weld location

摘要

In resistance spot welding an ultrasonic detecting probe is attached to one of the welding electrodes to record the noise emission level at the weld location. The maximum noise emission energy for a time window in each current half-wave is stored, starting with the current-carrying section formed by phase-chopping and ending 0.5-2 ms later. An ultrasonic emission value is formed from one or a number of the maximum energies as a measure of current density, which is used to calculate nugget dia. to be produced. ADVANTAGE - Weld quality can be assessed during welding.