Patent ID: 9109867
Filing Date: 2015-08-18
Classification: G01B,G01N

Abstract:
1. A weld detecting method that detects a weld on a work, by detecting a neck formed at the weld on the work, when elongating the work, comprising: obtaining at least one correlation, from among a correlation between a width of the neck and an amount of elongation of the work and a correlation between the width of the neck and an amount of change in at least one of a sheet thickness and a sheet width of the work before and after elongation of the work; calculating the width of the neck based on the at least one correlation by obtaining at least one of the sheet thickness, the sheet width, and the amount of elongation of the work from the obtained at least one correlation; setting a conveying speed of the work when detecting the neck, according to the calculated width of the neck; and detecting the neck by measuring the sheet width of the work at predetermined intervals, while conveying the work at the set conveying speed of the work.