| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inspection method of spot welding in which whether or not the welded base material is a base material of prescribed mild steel or high-tensile steel can be inspected too, in addition to an inspection of a welding situation of the base material.SOLUTION: An inspection method of spot welding related to the invention of the application related to the invention, in an inspection method of spot welding which inspects a melting part L generated by supplying a welding current to a base material of mild steel or a base material of high-tensile steel through a welding electrode including a built-in ultrasonic sensor 2 that implements oscillation of an ultrasonic wave and reception of a reflected wave of the ultrasonic wave, includes a receiving process in which a traverse ultrasonic wave is put into the base material from the ultrasonic wave sensor 2 and a reflection wave reflected from a boundary surface M1, M2 of the melting part is received by the ultrasonic wave sensor 2, a detection process detecting the time of receiving of the reflection wave by the ultrasonic wave sensor 2, and a determination process in which the receiving time detected of the reflection wave and a preacquired receiving time of reflection wave data are collated for determining whether or not the melting part L of a specified shape is formed.</p> |
