초록 ▼

A short circuit arc welding system is disclosed. The control scheme uses a current command signal to drive the output current. The command signal is comprised of a long-term current command that sets the long-term current command level and a real-time or short-by-short current command. Arc voltage f

A short circuit arc welding system is disclosed. The control scheme uses a current command signal to drive the output current. The command signal is comprised of a long-term current command that sets the long-term current command level and a real-time or short-by-short current command. Arc voltage feedback is used to determine if the desired arc length is present and to adjust the long-term command. The short-by-short current command is derived from real-time arc current feedback and is used to control the burn-off rate by an instantaneous, or short-by-short, adjustment of the current command. A function of the time derivative of arc power, less the time derivative of arc current, is used to detect, in real time, when the short is about to clear. A stop algorithm is employed that monitors the arc on a short-by-short basis. When the process is ending a very low current level is provided to avoid forming a ball. However, if a short is created, (indicated by a drop in arc voltage) after the low current level, a burst of energy is provided to clear of burn off the short. After the short is cleared, very low current is again provided to avoid forming a large ball. This is repeated until the wire stops and the process ends.

대표청구항 ▼

A short circuit arc welding system is disclosed. The control scheme uses a current command signal to drive the output current. The command signal is comprised of a long-term current command that sets the long-term current command level and a real-time or short-by-short current command. Arc voltage f

A short circuit arc welding system is disclosed. The control scheme uses a current command signal to drive the output current. The command signal is comprised of a long-term current command that sets the long-term current command level and a real-time or short-by-short current command. Arc voltage feedback is used to determine if the desired arc length is present and to adjust the long-term command. The short-by-short current command is derived from real-time arc current feedback and is used to control the burn-off rate by an instantaneous, or short-by-short, adjustment of the current command. A function of the time derivative of arc power, less the time derivative of arc current, is used to detect, in real time, when the short is about to clear. A stop algorithm is employed that monitors the arc on a short-by-short basis. When the process is ending a very low current level is provided to avoid forming a ball. However, if a short is created, (indicated by a drop in arc voltage) after the low current level, a burst of energy is provided to clear of burn off the short. After the short is cleared, very low current is again provided to avoid forming a large ball. This is repeated until the wire stops and the process ends. et al., 219/121.68; US-5257091, 19931000, Caicedo, Jr. et al., 356/358; US-5293025, 19940300, Wang, 219/121.71; US-5481407, 19960100, Smith, 359/742; US-5509553, 19960400, Hunter, Jr. et al., 216/013; US-5523543, 19960600, Hunter, Jr. et al., 219/121.62; US-5552574, 19960900, Merlin, 219/121.69; US-5571429, 19961100, Smith, 219/121.68; US-5593606, 19970100, Owen et al., 219/121.71; US-5614114, 19970300, Owen, 219/121.66; US-5633735, 19970500, Hunter, Jr. et al., 359/015; US-5702662, 19971200, Smith, 264/400; US-5737122, 19980400, Wilt et al., 359/436; US-5808272, 19980900, Sun et al., 219/121.68; US-5811754, 19980900, Nakatani et al., 219/121.83; US-5841099, 19981100, Owen et al., 219/121.69; US-5847960, 19981200, Cutler et al., 364/474.29; US-5894530, 19990400, Wilt, 382/312; US-5920973, 19990700, Kosmowski, 029/026.A; US-5984079, 19991100, Garcia, 198/397.02; US-5990444, 19991100, Costin, 219/121.69; US-5997223, 19991200, Kosmowski, 408/124; US-6022905, 20000200, Harris et al., 522/002; US-6086204, 20000700, Magnante, 351/212; US-6252196, 20010600, Costin et al., 219/121.69; US-6388780, 20020500, Monaghan et al., 359/035; US-6420675, 20020700, Lizotte et al., 219/121.7