| 摘要 |
A drill pipe for combination rotary-vibratory drills. The pipe includes an elongated pipe member and a connector for connecting the drill pipe to another drill pipe. The connector includes a threaded member at one end of the pipe member. The connector and pipe member have overlapping portions. The portion of one of the members has a plurality of circumferentially spaced-apart slots which are generally aligned axially with the pipe member, and welds along the slots securing the pipe member and connection member together.
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