B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/62
B23K 9/12 (2006.01) B23K 9/02 (2006.01) B23K 9/127 (2006.01) B23K 9/30 (2006.01)
Patent
CA 1075324
METHOD FOR CONTROLLING TORCH POSITION AND TRAVEL IN AUTOMATIC WELDING Abstract of the Disclosure: To maintain control of arc position in travel along a predetermined welding path, wherein the arc of equivalent heat source is given at least a minimal lateral reciprocation, an elec- trical characteristic, such as current, is sampled to obtain a continuous signal containing a component which varies with lateral position of the heat source. The first signal is also sampled at the extreme lateral positions of the arc to obtain comparable sig- nal elements which are accumulated, amplified, compared with each other and/or with reference signals, and resultant outputs are used to initiate corrective action. This action may involve giving warning to a human operator or it may involve partial or full control of a physical or mechanical correction procedure. A general application is to the welding of a groove formed between adjacent work pieces. A more specific application is to weld joints involving narrow gaps between lengths of large pipe in pipe- line building. Moreover, the invention may have application wherever welding is done along a main path having an up-raised element along the path. The invention is applicable also to situations wherein lateral oscillation is not really required for gap filling but is used merely as a means to isolate control signals for maintaining an accurate center or main line travel position of the arc or heat source.
282163
Crc-Crose International
Crc-Evans Pipeline International Inc.
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