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A method of forming an overlapping section involves radiating a plasma onto a first overlapping part of a first workpiece, over which oil is spread. Thereafter, silicone rubber, which functions as an adhesive and a sealant material, is applied onto the first overlapping part, and a second overlappin

A method of forming an overlapping section involves radiating a plasma onto a first overlapping part of a first workpiece, over which oil is spread. Thereafter, silicone rubber, which functions as an adhesive and a sealant material, is applied onto the first overlapping part, and a second overlapping part of a second workpiece is overlapped on the first overlapping part. When the components are left standing still for a predetermined period of time, the overlapping section is formed, in which the first overlapping part and the second overlapping part are adhered to one another.

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What is claimed is: 1. A method for forming an overlapping section, comprising the steps of: radiating a plasma onto a part of a first workpiece of a metal to which oil is adhered; applying a polymer material to said part of said first workpiece where said oil irradiated with said plasma exists, wh

What is claimed is: 1. A method for forming an overlapping section, comprising the steps of: radiating a plasma onto a part of a first workpiece of a metal to which oil is adhered; applying a polymer material to said part of said first workpiece where said oil irradiated with said plasma exists, wherein said polymer material functions as an adhesive or a sealant material; and overlapping a second workpiece of a metal on said part of said first workpiece to which said polymer material has been applied, so that said polymer material is interposed between said first workpiece and said second workpiece. 2. The method for forming an overlapping section according to claim 1, wherein one of said first workpiece and a plasma-radiating mechanism is fixed in position, and said plasma is irradiated while moving the other of said first workpiece and said plasma-radiating mechanism. 3. The method for forming an overlapping section according to claim 2, wherein a distance between said first workpiece and a plasma gun of said plasma-radiating mechanism is 5 to 10 mm, and a movement speed of said first workpiece or said plasma-radiating mechanism is within 30 mm/second. 4. The method for forming an overlapping section according to claim 3, wherein said plasma gun of said plasma-radiating mechanism has a diameter of 3 mm and a length of 40 mm, and an applied electric power is 80 W. 5. The method for forming an overlapping section according to claim 3, wherein said plasma gun of said plasma-radiating mechanism has a diameter of 3 mm and a length of 60 mm, and an applied electric power is 130 W. 6. The method for forming an overlapping section according to claim 3, wherein said plasma gun of said plasma-radiating mechanism has a diameter of 3 mm and a length of 75 mm, and an applied electric power is 170 W. 7. The method for forming an overlapping section according to claim 1, wherein said polymer material is silicone. 8. The method for forming an overlapping section according to claim 3, wherein a functional group of said oil is oxidized into a carboxylic acid group by said plasma radiation, and said carboxylic acid group reacts with a ketoxime group existing in said silicone. 9. The method for forming an overlapping section according to claim 8, wherein each of said first workpiece and said second workpiece is composed of aluminum. 10. The method for forming an overlapping section according to claim 9, wherein a hydrogen bond is produced between said carboxylic acid group and aluminum hydroxide of said workpiece. 11. The method for forming an overlapping section according to claim 1, wherein said oil is spread by means of compressed gas before irradiating it with said plasma. 12. The method for forming an overlapping section according to claim 11, wherein an amount of said oil is 0.025 to 0.075 cc, a jetting pressure of said compressed gas is 0.05 MPa, and a jetting time is 1 second. 13. The method for forming an overlapping section according to claim 1, wherein each of said first workpiece and said second workpiece is composed of aluminum. 14. The method for forming an overlapping section according to claim 13, wherein a functional group of said oil is oxidized into said carboxylic acid group by said plasma radiation, and a hydrogen bond is produced between said carboxylic acid group and aluminum hydroxide of said workpiece. 15. The method for forming an overlapping section according to claim 1, wherein the step of applying the polymer material to said part of said first workpiece includes applying the polymer material in columnar form. 16. A method for forming an overlapping section for an internal combustion engine, comprising the steps of: radiating a plasma onto a part of a first workpiece formed of a metal to which oil is adhered; applying a polymer material to said part of said first workpiece where said oil irradiated with said plasma exists, wherein said polymer material functions as an adhesive or a sealant material; and overlapping a second workpiece formed of a metal on said part of said first workpiece to which said polymer material has been applied, so that said polymer material is interposed between said first workpiece and said second workpiece; wherein each of said first workpiece and said second workpiece are portions of the internal combustion engine. 17. The method for forming an overlapping section according to claim 16, wherein the step of applying the polymer material to said part of said first workpiece includes applying the polymer material in columnar form. 18. The method for forming an overlapping section according to claim 17, wherein a diameter of said columnar form is approximately 8 mm. 19. The method for forming an overlapping section according to claim 16, wherein said metal of the first and second workpieces is aluminum and said polymer material is silicone. 20. The method for forming an overlapping section according to claim 16, wherein one of said first workpiece and a plasma-radiating mechanism is fixed in position, and said plasma is irradiated while moving the other of said first workpiece and said plasma-radiating mechanism.