一种钛合金钻杆旋转摩擦焊接工艺的数值模拟与试验研究

Numerical Simulation and Experimental Study on Rotary Friction Welding of Titanium Alloy Drill Pipe

苛刻能源钻采环境中钛合金石油钻杆与螺纹接头连接处易发生断裂失效等问题,对未来石油钻杆的连接提出了更高的要求。采用数值模拟和试验相结合的方法对钛合金管材旋转摩擦焊接接头飞边成形、温度场演变和组织性能等进行研究。结果表明,在文中所采取的工艺参数条件下,焊接界面结合良好,拉伸试验后,断裂发生在母材侧,焊接界面两侧的硬度呈“W”型分布;数值模拟温度场变化表明,焊接初期界面温度上升极快,随后进入稳态阶段,此阶段界面塑性金属被大量挤出,形成飞边,包覆在管外壁上。所建立的二维轴对称模型计算结果与试验结果相比,误差控制在合理范围内。文中通过先进固相连接技术研究,为钛合金石油钻杆与螺纹接头的高质量连接提供参考。

Titanium alloy drill pipes are prone to fracture and failure at the joints with threaded joints,posing higher requirements for future petroleum drill pipe connections in harsh energy drilling and production environments.In this paper,numerical simulation and experimental methods are used to study the flash formation,temperature field evolution,microstructure and properties of rotary friction welded joints of titanium alloy pipes.The results show that under the conditions of the process parameters adopted in this paper,the bonding is excellent.After the tensile test,the fracture occurs on the base metal side,and the hardness distribution on both sides of the welding interface presents a“W”shape.The numerical simulation of temperature field changes shows that the interface temperature rises very quickly at the initial stage of welding,and then enters a steady-state stage,where a large amount of interfacial plastic metal is extruded,forming flash edges,and coated on the outer wall of the pipe.The calculated results of the two-dimensional axisymmetric model established in this paper are compared with the experimental results,and the error is controlled within a reasonable range.Through advanced solid phase connection technology reseath,this article provides a reference for high-quality connection of titanium alloy drill pipes and threaded joints.