Welding quality inspection apparatus and a method for the same

A welding quality inspection apparatus, comprising:

• a welding position calculation part configured to calculate a first virtual welding position based on an actual welding position of a robot welding gun;
• a comparison and verification part configured to:
• calculate a first error by comparing the first virtual welding position and a reference welding position of a drawing, and
• determine that inspection is necessary when a magnitude of the first error is within a reference range;
• a calibration part configured to, when a ratio of determining that inspection is necessary, by the comparison and verification part, is a preset criterion or more, generate a second virtual welding position based on the first virtual welding position by repeating calibration until the ratio of determining that inspection is necessary becomes less than the preset criterion;
• and
• a compensation part configured to extract a second error between the second virtual welding position and the reference welding position when the calibration is finished, and to compensate the second error when the second error is a predetermined reference value or more.