| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring device for a welding state capable of obtaining clear picture information of a whole weld zone. SOLUTION: A color liquid crystal filter 7 having many picture elements is arranged at the front of a lens of a CCD camera 6 to pick up a picture of a weld zone. After a picture signal as an output signal of the CCD camera 6 is processed, by controlling each picture element of the color liquid crystal filter 7 with a liquid crystal control part 9, the luminance of the whole weld zone is made uniform. |
