| 摘要 |
A cooling plate configured so that the cooling efficiency can be improved, the weight can be reduced, high corrosion resistance can be provided, the work efficiency can be improved, and furthermore the manufacturing cost can be reduced, and a manufacturing method for the cooling plate is provided. The manufacturing method for a cooling plate including a cooling plate body 2, a groove 3 formed so as to open to a top surface 2a of the cooling plate body 2, a lid member 4 that is arranged so as to close the opening of the groove 3, and is joined to the cooling plate body 2 by friction stir welding, and a refrigerant passage 1 having a transverse cross section defined by the groove 3 and the whole of a back surface 4c of the lid member 4, comprises the steps of: fitting the lid member 4 to the groove 3 and then temporarily tacking the lid member 4 to cooling plate body 2; and placing a rotation center 6a of a friction stir welding tool at a position which separates from the fitting position between the lid member 4 and the groove 3 to the outside through a distance d in the width direction after temporary tacking, and then performing friction stir welding. The cooling plate is manufactured by the above-described manufacturing method for a cooling plate.
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