Method for controlling an automatic pipe welder
AssigneeHitachi, Ltd.
InventorsTsutomu Omae, Takanori Shibata, Keiziro Sakai, Tomio Iizuka, Takaichi Koyama
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Abstract
Method for controlling an automatic pipe welder is disclosed. In the automatic welder which requires remote control, welding conditions for butt welding pipes are stored and an actual joint geometry or groove shape is sensed. From signals relating to the stored welding conditions and the sensed groove shape, a control command signal in actual welding is produced to effect welding under an optimum condition. On the other hand, an arc condition at an actual welding point and a melting condition of a metal are monitored and displayed to modify the welding conditions in accordance with the monitored condition to control the automatic pipe welder.
Claims8
Method for remotely controlling an automatic welder for butt-welding pipes, comprising the steps of:
- (a) storing into a memory, welding conditions in a plurality of regions distributed on a periphery of the pipe;
- (b) sensing the position of a welding torch on the periphery of the pipe, reading out the welding conditions stored in said memory at the welding condition modifying points and continuing the welding operation in accordance with the welding conditions read out;
- (c) stopping the welding operation after the completion of one revolution of welding and returning the welding torch to an initial point;
- (d) actuating a groove shape sensor during the step (c) to sense groove shape;
- and
- (e) positioning said welding torch for effecting welding of the next layer in accordance with the groove shape sensed in the step (d) and repeating above steps in accordance with welding conditions for the next layer stored in the memory thereby effecting multi-layer welding.
Dependencies are inferred from the claim text.