| 摘要 |
The present invention relates to a method to judge a quality of spot welding and to a spot welding quality judging method of a spot welding monitoring apparatus; digitizing detected welding voltage and welding current of a sensor during spot welding; receiving the digitized data with electrification time information from a welder, and monitoring the spot welding; comprising: a step of setting reference date of the spot welding monitoring apparatus for quality judgement and average welding voltage (V) and a value of average current (i) x time (t) on the reference date; and a step of judging the quality of the spot welding monitoring apparatus as spatter in the case such that current (i) x time (t) with respect to welding voltage equal to an average welding voltage on the reference date is higher than the average current (i) x time (t) on the reference date, judging the quality as separation in case that current (i) x time (t) with respect to welding voltage equal to the average welding voltage on the reference date is lower than the average current (i) x time (t) on the reference date, judging the quality as omission in the case that current (i) x time (t) with respect to the welding voltage equal to the average welding voltage on the reference date does not occur, and judging the quality as tolerance in the case that current (i) x time (t) with respect to welding voltage equal to the average welding voltage on the reference date is lower than the average current (i) x time (t) on the reference date and higher than current (i) x time (t) corresponding to the quality judged as the separation, thereby being capable of automatically judging the quality of spot welding. |
