钻杆惯性摩擦焊接角偏差控制

The Angular Deviation Control of Drill Pipes in Inertia Friction Welding

钻杆角偏差是在焊接过程中产生的,其影响钻杆直度并严重影响钻杆使用寿命。通过宝钢生产实践发现,惯性摩擦焊接角偏差控制较连续摩擦焊接困难。在分析惯性摩擦焊接与连续摩擦焊接工艺差别的基础上,研究了钻杆角偏差的产生机理。研究表明,惯性摩擦焊接初始转速快、焊接压力高,造成焊接初始阶段的扭矩峰值偏高;高扭矩容易造成焊接工件出现径向位移,由此导致角偏差增大。提出了改善钻杆惯性摩擦焊接角偏差的新方法:采用平面—锥面焊接结构,削减初始扭矩峰值;采用全浮动夹具并增大定心夹具刚性以及时纠正工件径向位移。

The angular deviation of drill pipes is generated in the welding process.It affects the straightness and life span of drill pipes.Baosteel s manufacturing experience shows that it is more difficult to control the angular deviation in the inertia friction welding process than in the directive friction welding.On the basis of the analysis of the differences between inertia friction welding and directive friction welding,the cause of the angular deviation was explored.The results showed that the inertia friction welding features high initial velocity and high pressure, which would induce high torque peak in the early phase of the welding. It is high torque that causes radial displacement, and then enlarges angular deviation. Some new methods to improve drill pipe＇ s angular deviation preci- sion were given. One method was to use a flat-pyramidal welding structure so as to reduce the torque peak. The other method was to use the all-floating clamp to enhance stiffness of the self-centering clamp so as to reduce the radial displacement.