A steel oil pumping rod resistant to bending fatigue and its processing technology
A technology for oil pumping polished rods and bending resistance, applied in the direction of drill pipes, drill pipes, casings, etc., can solve problems such as difficult processing, high cost, and polished rod breakage, and achieve improved fatigue performance, good division of labor and cooperation, and resistance to elasticity The effect of excellent deformation ability
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[0030] see figure 1 , a steel oil pumping polished rod 1 resistant to bending fatigue, which sequentially includes an upsetting end 2, a rod body 3, a bending fatigue-resistant round rod section 4 and a closed end 5 according to the connection sequence, and the rod body 3 is a circular cross-section steel straight rod, the rod body 3 and the bending fatigue-resistant round rod section 4 are connected by a welding process, and the closed end 5 is connected with the bending fatigue-resistant round rod segment 4 by a welding process. The metallurgical connection between the two ends of the bending fatigue-resistant round rod section is realized, and a complete and integrated bending fatigue-resistant round rod section can be obtained. At the same time, it can also be connected with the two ends of the oil-pumping polished rod, which greatly improves the overall toughness and strength of the polished rod. Anti-fatigue properties. The diameter of the bending fatigue-resistant roun...
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