Surface treatment method, surface treatment apparatus,...

Metal fusion bonding – Process – Using dynamic frictional energy

Reexamination Certificate

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C228S002100

Reexamination Certificate

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06991149

ABSTRACT:
Two beams17and18perpendicular to a moving trajectory Q are formed in an intake port opening14of a cylinder head material to serve as margins for interfering with deformation of the opening14due to softening of the material, thereby a deformation of the material and a void caused by the deformation can be prevented in the frictional stirring with the rotary tool.

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