| 摘要 |
A connection rod ( 1 ) for rock drilling includes a first rod part ( 2 ) whidh has an external thread ( 4 ) provided at one end thereof, wherein the end of the rod opposite to the one end includes an end portion ( 6 ) which carries an internal thread ( 5 ), wherein the end portion ( 6 ) is joind to the first rod part ( 2 ) by friction welding and wherein the end portion ( 6 ) has been heat treated prior to being joined to the first rod part ( 2 ). The invention also relates to a method of producing such a connection rod. |
