PURPOSE: To pressure-weld a strip in the atmosphere and to continuously form a clad material by projecting a laser beam close to the apex of a strip approaching part by passing a dissimilar metal strip through rolls respectively, heating the trip surface rapidly and rolling it at the specific percentage reduction in thickness.
CONSTITUTION: Dissimilar metal strips 1, 2 are overlapped at a roll bits inlet port 8, rolled by a rolling roll 5 and joined. A laser light 9 is projected on the metal strips 1, 2 of the roll bit inlet port 8 as a light flux Q. The light passing a point 10 repeats points 11W14 and the reflection, giving a strip energy at the reflection point. The energy giving is similarly performed on the other light in the light flux Q, the strip is rapidly heated and rolled immediately at the percentage reduction in thickness of more than 4%. The growth of the oxide film on the mating face of the strip is therefore restrained and a strong joining is obtainable.
MATSUMOTO HIROMI
KIKUMA TOSHIO
