| 摘要 |
PURPOSE:To make it unnecessary to apply flux and wash off it, so as to decrease the number of processes and prevent corrosion, by laser-beam-welding a tappet main body with a guide main body of a plunger. CONSTITUTION:A tappet main body 1 and a guide main body 2 are produced through plastic working, and at the same time, surface treatment, such as carburizing treatment or nitriding treatment, is performed on them. After the guide main body 2 is inserted with pressure into the tappet main body 1, laser beam is irradiated to the part of contact between the inner circumferential surface 4 of the tappet main body 1 and the outer circumferential surface 5 of the guide main body 2, and this part is welded. In this way, the processes of application of flux and washing of it can be omitted, and corrosion caused by the defective washing is prevented. Moreover, there is not fear of deterioration of material, because it becomes unnecessary to perform a high temperature treatment accompanied with brazing for a long time. |
