Method for bonding a seal member and dissimilar materials made from metals

A method of bonding dissimilar metallic materials, comprising:

• overlapping a first material and a second material, the first material made from a different metal than the second material with a seal material interposed between the first material and the second material, forming an oxide film on the second material between the second material and the seal material;
• interposing a third metallic material different from both the first material and the second material between the first material and the seal material;
• pressing the first material and the second material with the interposed seal material and third metallic material together to discharge the seal material from a bonding interface to a periphery, contacting the oxide film with the third metallic material after the seal material is discharged, the oxide film being broken at the bonding interface during pressing to allow contact between the third metallic material and the second material;
• eutectically fusing the third metallic material with the second material at the bonding interface while pressing to produce a eutectic fused body;
• discharging the eutectic fused body from the bonding interface to the periphery with further pressing;
• and bonding the first material directly to the second material after the eutectic fused body has been discharged.