| 摘要 |
The present invention relates to a drill rod for percussive rock drilling and a method in order to manufacture the drill rod. The drill rod (10) has a first rod part (11) comprising a free end (11A), an opposite end (11 B), an inner duct (14), and an externally threaded part (15) near the free end, the externally threaded part being entirely or partly hardened by heat treatment, and an additional rod part (13) comprising a free end (13A), an opposite end (13B), an inner duct (17), and an internally threaded part (18) near the free end (13A) of the second rod part, the internally threaded part (18) being entirely or partly hardened by heat treatment. The opposite ends (11B,13B) of the rod parts have been welded together with each other or with an intermediate hollow rod part (12) in order to define a weld zone (19,20) next to each opposite end. The weld zone is not heat-treated after welding. |
