Written by a pioneer in the field, this book covers all aspects of the emerging technology of arc welding. Part one quantitatively describes the dynamic behavior of arc welding, the power sources used, and their effect on welding technology through the basis of control theory. The second part describes new ways of controlling the welding arc through modern electronics. The next two sections establish the first mathematical model of the arc sensor on the basis of control theory and introduce a new method for measuring weldment temperature fields using the colorimetric-imaging method. The fifth and final section explains the idea of recognizing weld grooves with a three-dimensional vision system and automatic programming of the weld path.4.5.2 Primary circuit In the normal case for a constant-voltage power source, the transistor emitter is used for the output; ... Although using transistors as the power element of welding power sources is out of date, its analysis helps clarify the control ... When a negative current feedback loop is used, the control-block diagram is as illustrated in Fig 4.15b. v I 4.76 Characteristics for emitter output From Fig.
|Title||:||Arc Welding Control|
|Publisher||:||Woodhead Publishing - 2003|