METHOD AND DEVICE FOR DETECTING LOCATION OF WELD LINE

摘要

PROBLEM TO BE SOLVED: To accurately detect the center location of a weld line by discriminating detectable data of surface displacement data through the use of a threshold value in a discrimination process and determining the center location of the weld line in a weld line location determining process. SOLUTION: A laser displacement sensor 61 to irradiate the surface of a welding base material part across a weld line 4 with laser light 6 and to receive reflected light from the weld line 4 and a welding base material without the weld line 4 is provided at the tip part of a travelling body 2 for automatically following a weld line. Then the surface displacement data creating means of a data processing part 60 processes a location x in a travelling direction and a surface displacement z in the direction of a surface height in the location x to create surface displacement data z (x). A surface displacement data correcting means performs correction so that the surface displacements of sections at both end sides of the surface displacement data may become equal to each other to obtain displacement-corrected data z1 (x). The displacement-corrected data is discriminated at a discriminating function part 70, and a weld line location determining function part 80 determines the center location xc of the weld line on the basis of the discriminated displacement-corrected data.