| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a welded portion detection method, capable of reducing the period necessary for detecting a welded portion of a work and performing detection of a welded portion, at low cost. <P>SOLUTION: The welded portion detecting method for detecting a welded portion is adapted to detect a welded portion Y of a work. The welded portion detecting method includes a calculation process of calculating the width L of a constricted section, based on a correlation in such a manner that at least one of correlations, having a correlation between an extension amount of a work 100 and the width L of the constricted section and correlation between a change amount of at least one of a plate width H and a plate thickness D of the work 100, before and after the extension of the work and the width L of the constricted section is obtained beforehand; and the extension amount, the plate width H and the plate thickness D of the work 100 of which the correlations between the extension amount and the width L and between the change amount and the width L of the constricted section are obtained, are acquired; and the method, further, includes a setting process of setting a conveyance speed V2, according to the width L of the constricted section calculated in the calculation process, and a detection process of detecting the constricted section 101 by measuring the plate width H of the work at predetermined intervals, while conveying the work 100 at the conveyance speed V2 set in the setting process. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
