| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for joining dissimilar metals capable of joining dissimilar metallic materials with each other without impairing the flexibility of the appearance and the design by irradiating high energy beams from the outer side of a vehicle body when the method is applied to the joining of an automobile body structure using, for example, a light alloy-made roof panel. <P>SOLUTION: A first plate 1 formed of a high melting point material and a second plate 2 formed of a low melting point material are superposed on each other and irradiated with the high energy beams from the second plate 2 side to perform the lap welding of these plates. Through-holes 2a are formed in the second plate 2 in a stitched manner. A third plate 3 formed of a high melting point material of the similar kind to that of the first plate is further superposed on the second plate 2. The first plate 1 and the third plate 3 are intermittently weld-joined by the high energy beams B irradiated on the third plate 3 via the through-holes 2a. Then, a part in the vicinity of the joining with melting is pressed to join the first and third plates 1, 3 with the second plate 2 in the vicinity of the weld-joined part. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
