| 摘要 |
The present invention relates to a friction welded product for rock drilling, including a first component (25) and a second component (22) of parent material joined by a friction weld (27), said components having a central inner passage (26). Both components are made from a steel having a chemical composition such that the hardness in the most tempered part of the heat affected zone close to the weld is at least the same as for the core hardness of the rod with normal hardness when cooled to room temperature subsequent to the friction welding thereby having a minimum core hardness at the heat affected zone above 390 HV1. The present invention further relates to a method for manufacturing a friction welded product for rock drilling. |
