Making internal combustion engine, comprises connecting cylinder block and cylinder head to each other without screws by friction welding process, where contact or welding surfaces of block and head are provided with excess of material

摘要

The method comprises connecting cylinder block (2) and cylinder head to each other without screws by friction welding process. Contact or welding surfaces (5) of the cylinder block and cylinder head are provided with excess of material. The contact surfaces provided between the cylinder block and the cylinder head have a dimension that is a material thickness, resist a friction welding pressure, and are roughened during welding.