素材や製品の一部材質を変更することで軽量化や高機能化，コストの低減が可能である．そのため，異種金属間での接合が多く行われている．例えば，ラジエータなどの熱交換器では，熱伝導率の高い銅や銅合金と耐食性や機械的強度が高いステンレス鋼の接合が望まれている．%With a technological advance of the industrial product; weld between the different kind metal is demanded. Adove all; demands for welding of the different kind metals; copper and stainless steel; increase. However; forming a welded joint between stainless steel and a copper is difficult because the physical properties of the two metals - such as thermal conductivity and melting point - are different and they do not form an alloy. In this report; laser welding of copper (C1020) plate and stainless steel (SUS304) plate of thickness 1.5mm using a disk YAG laser was examined. The bondable welding conditions were selected; and the structure of welding copper and stainless steel was evaluated by EPMA and X-ray diffraction. As a resu it was found that copper and stainless steel were mixed and were joint by mechanical linking; when laser irradiation position put off in the copper side from 0. lmm to 0.2mm. In addition; it was found that it didn't separate of each component and didn't generate of new alloy in the weld.
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