| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for evaluating welding penetration depth to evaluate welding penetration depth by using an ultrasonic wave after sealing of a can by laser welding. <P>SOLUTION: The method for evaluating welding penetration depth to evaluate the welding penetration depth D of a weld 11 in a workpiece 2 formed by laser welding of a can body 9 and a lid member 10 has an echo signal acquiring process wherein an echo signal is acquired by scanning the workpiece 2 with the ultrasonic wave transmitted thereto, an imaging process wherein the echo signal corresponding to each of the surface of the lid member 10 and an interface of the can body 9 and the lid member 10 is imaged, a binarizing process wherein a surface echo image A and an interface echo image B thus obtained are turned into binarized images, a subtracting process wherein the binarized interface echo image B is subtracted from the binarized surface echo image A, a contour extracting process wherein the contour of the weld 11 is extracted from an image obtained by subtraction, and a determining process wherein the welding penetration depth D of the weld is calculated, based on the contour, and thereby the quality of the weld 11 is determined. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
