To manufacture a lightweight vehicle body having sufficient joining strength at low cost.
An aluminum alloy-made roof panel 10 overlaps steel-made header members 5, 6 or the like in a sub line 31 of a manufacturing line 30, the roof panel 10 is locally subjected to softening and the plastic flow by the friction heat of a rotary tool 45 pressed from the side of the aluminum alloy-made roof panel 10, and a plurality of parts of overlapped portions of the roof panel 10 and the header members 5, 6 or the like are subjected to solid-phase welding to form a roof assembly 26. Then, the aluminum alloy-made roof panel 10 included in the roof assembly 26 overlaps two steel sheets including components such as a roof side rail 8 and a pillar reinforcement 15 or the like among other component groups of a vehicle body on a main line 32 of the manufacturing line 30 to join the plurality of parts by the electric resistance spot welding.
TANAKA KOJIRO
| JP2005119577A | 2005-05-12 | |||
| JP2007144473A | 2007-06-14 | |||
| JP2005288525A | 2005-10-20 | |||
| JP2007160342A | 2007-06-28 |
Masataka Otani
Jiro Higuchi
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