Method and apparatus for controlling root pass weld penetration

Details Method and apparatus for controlling root pass weld penetration Method and apparatus for controlling root pass weld penetration

1987-08-25

1988-03-22

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219 60A, 21912434, 21912512, 21913001, B23K 912

Patent

active

047330511

ABSTRACT:
The invention is concerned with controlling weldpool penetration during root pass welding in an open butt joint defined in a workpiece to be welded by a welding torch with a welding wire being continuously fed from the welding torch to the joint to form a weldpool penetrating the joint, the workpiece and welding torch being movable relative to one another. A visual sensor is positioned ahead of the welding torch and in alignment with the joint for frontly viewing the weldpool at an angle of about 10.degree. to about 20.degree. relative to a line tangent to the workpiece at the weldpool, to thereby provide a full image of the weldpool defining a weldpool contour line, the sensor and welding torch being disposed on a common side relative to the workpiece. The weldpool image is then processed through a computer including image processor operatively coupled to controller, the image processor analyzing the weldpool contour line to derive therefrom weldpool penetration depth and comparing the weldpool penetration depth with a predetermined value, to thereby provide an information signal representative of weldpool penetration error which is fed to the controller, the controller issuing control signals in response to the information signal for controlling welding parameters such as to provide a root pass weld having a predetermined penetration.

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R. Niepold et al., "PASS-A Visual Sensor for Seam Tracking and On-Line Process Parameter Control in Arc-Welding Applications", Proc. 14th Int. Symposium on Industrial Robots, Oct. 1984, pp. 375-385.

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