WELDING MACHINE, METHOD FOR MONITORING WELDING OF METAL STRIP, WELDING METHOD THEREFOR, AND PRODUCTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a welding machine, a method for monitoring the welding of metal strips and a welding method therefor by which it can be determined whether a preceding metal strip and a succeeding metal strip are welded in such a manner that they are bent at a connection part, i.e., in a V shape is formed or not with the reduced number of sensors, and welding can be performed without forming the V shape.;SOLUTION: In the method for monitoring the welding of metal strips, when the preceding metal strip 2a and the succeeding metal strip 2b are superimposed in a state where they are clamped with a clamp 12a for the preceding metal strip and a clamp 12b for the succeeding metal strip, respectively, or, they are butted and welded, image pick-up is performed with a CCD camera 7 from both width side directions of the preceding metal strip 2a and the succeeding metal strip 2b, thus the projecting length of the preceding metal strip 2a from the clamp 12 for the preceding metal strip and the projecting length of the succeeding metal strip 2b from the clamp 12b for the succeeding metal strip are recognized. When the absolute value in a difference between the projecting length on the OP side and the projecting length on the DR side exceeds a fixed value at least in either the preceding metal strip 2a or the succeeding metal strip 2b, it is determined that there is the possibility that the preceding metal strip 2a and the succeeding metal strip 2b are welded in such a manner that they are bent at the connection part.;COPYRIGHT: (C)2009,JPO&INPIT