B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/67
B23K 9/12 (2006.01) B23K 9/095 (2006.01)
Patent
CA 1276245
Abstract of the Disclosure The invention is concerned with a method and apparatus for 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 sensing means is positioned ahead of the welding torch and in alignment with the joint for frontly viewing the weldpool at an angle of about 10° to about 20° 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 sensing means and welding torch being disposed on a common side relative to the workpiece. The weldpool image is then processed through computer means including image processing means operatively coupled to control means, the image processing means analysing 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 control means, the control means 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.
537835
Fafard Pierre
Nadeau Francois
Patenaude Guy
Tremblay Jean
Canadian Patents And Development Limited - Societe Canadienne De
Nadeau Francois
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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