PURPOSE: To produce a clad material with good bonding and mechanical properties by simple means by placing a cladding metal consisting of low m.p. metals on a base material consisting of high m.p. metals and heating and holding these to the intermediate temp. of the m.ps., of both then cooling these.

CONSTITUTION: The high m.p. side metals such as carbon steel for general structure constituted of two kinds of metals differing in m.p. by ≥50°C are used as a base material 1 and a frame material 2 consisting of stainless steel is provided by welding the same to the circumference of said material. A cladding metal 3 consisting of low m.p. side metals such as naval brass, cupronicke, A.M. bronze is placed thereon, and further, a reducing flux of metallic carbonate, etc. is sprayed on the metal 3. After these materials are heated up to the temp. at which only the metal 3 melts in a heating furnace, a heat insulating material 11 is sprayed on the metal 3a in a molten state. The bottom of the material 1 is positioned flush with the level of cooling water in a cooling water tank, and cooling water 13 is ejected toward the center at the bottom surface of the material 1 in contact therewith, whereby the work 5 is cooled.