| 摘要 |
<p>The composite piston for an internal combustion engine has upper and lower part. The upper part has cavity for combustion chambers, and is used in high performance engines. The upper edge of the piston top face cavity is especially protected against thermal cracking. A ring of high temperature resistant material is welded on the edge (20) of the combustion chamber cavity in the piston. This ring is welded without use of filler metal by electron beam welding on the piston upper part (12) or by friction welding. A conical seat between the ring (16) and the piston upper part (12) is provided for welding. A tubular component can be welded by friction welding and excess material is removed by machining.</p> |
