A novel weld seam detection method for space weld seam of narrow butt joint in laser welding

摘要

Highlights?The proposed vision sensor uses three laser stripes with different wave length.?The advantages of active light vision and passive light vision are combined.?Butt joint with no misalignment and width less than 0.1?mm can be measured.?Seam width, seam center and normal vector can be obtained in a single image.AbstractStructured light measurement is widely used for weld seam detection owing to its high measurement precision and robust. However, there is nearly no geometrical deformation of the stripe projected onto weld face, whose seam width is less than 0.1?mm and without misalignment. So, it’s very difficult to ensure an exact retrieval of the seam feature. This issue is raised as laser welding for butt joint of thin metal plate is widely applied. Moreover, measurement for the seam width, seam center and the normal vector of the weld face at the same time during welding process is of great importance t