Method for quality control of a welding joint between a pair of ends of conducting elements of an inductive winding of a stator

A method for quality control of a welding joint between a pair of ends of conducting elements of an inductive winding of a stator, said method being performed by a computer, comprising the steps of:

• acquiring a 3D reconstruction of said welding joint;
• extracting a plurality of 2D grayscale blob areas from said 3D reconstruction of said welding joint, transversely sectioning said 3D reconstruction with a plurality of cutting planes arranged at a progressive distance from a peak of said 3D reconstruction, a white area of each one of said grayscale cutting planes being one of said 2D grayscale blob areas;
• converting said plurality of 2D grayscale blob areas to a function of 2D grayscale blob areas which depends on a distance from a peak of said welding joint with respect to each 2D grayscale blob area, each value of said function of 2D grayscale blob areas corresponding to said white area at said distance from said peak of said welding joint;
• calculating a respective first derivative of said function of 2D grayscale blob areas;
• calculating a respective second derivative of said function of 2D grayscale blob areas;
• and
• seeking instability peaks in a trend of said second derivative of said function of 2D grayscale blob areas, said instability peaks being local maximum or minimum values of said second derivative, a point that follows said instability peaks corresponding to the base of said welding joint.