| 摘要 |
An electric arc welding system includes programming circuits for controlling the position of a welding torch on a carriage wherein the carriage is caused to move along in the direction of a weld path on a member to be welded. The programming circuits cause the torch to move back and forth across the weld path as the carriage moves parallel to the weld path, the excursion time of the torch and dwell time of the torch on either side of the path at the limits of its excursion constituting the selected position program. The torch thus follows a repetitive generally truncated sawtooth pattern. The welding current to the torch is connected into the programming circuits to be responsive to a selected program so that the level of current provided during the dwell times is different from the level of current provided during the excursion times. Additionally, the speed of wire feed for the torch can be made responsive to a selected position program so that the speed wire is fed is different during the dwell times from the speed wire is fed during the excursion times. Torch centering and arc voltage controls are included, the overall system functioning to provide welds of greatly improved quality.
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