Patent ID: 8183497

Claim:
A spacer grid welding apparatus using a laser, which includes a pulse laser generator, a collimation lens and a focus lens, the spacer grid welding apparatus comprising: a servo motor configured to move the pulse laser generator on a X-Y plane; a beam splitter configured to split a path of light, reflected from a welding spot of a spacer grid, from a path of a laser beam generated from the pulse laser generator; an image sensor configured to receive light, which is reflected from the welding spot of the spacer grid and split at the beam splitter, in a low temperature period of off-time of the pulse laser generator and further configured to sense and store an image of the spacer grid; and a welding controller configured to store position information about welding spots and a welding sequence of respective welding spots, to control the image sensor to capture the image of the spacer grid, to receive the image of the spacer grid from the image sensor, to calculate an accurate position of the welding spot based on the received image, to correct position information of the welding spot based on the calculated position, and to control the servo motor so that the pulse laser generator can accurately collimate a next welding spot based on the corrected position information.