地质钻杆摩擦焊接头组织与性能

首次采用摩擦焊接工艺对地质勘探用钻杆的管体与接头进行了焊接试验。探讨了不同的热处理工艺条件对DZ60钢钻杆管体与40Cr钢接头摩擦焊接头组织与性能的影响，并与采用热墩粗工艺生产的钻杆管体组织与性能进行了对比。试验结果表明，采用摩擦焊接及焊后调质热处理工艺制造的DZ60地质钻杆焊接接头的常规力学性能指标均高于地矿部DZ60地质钻杆管材的技术标准规定的数值，并优于采用现行热墩粗工艺制造的钻杆管材的力学性能数值。同时发现，采用合适的焊后回火热处理温度，可以有效提高焊接接头的抗拉强度与屈服强度，使其各项力学性能达到DZ60钻杆管材的技术标准，从而有效减少地质钻杆摩擦焊接头焊后热处理工艺，降低制造成本。

Heat Treatment Technology of the Dissimilar Materials' Friction Welded Joints of the Geological Drill Pipe

In this paper, the drill pipe and its tie-in are welded by friction welding successfully. It''s the first time to introduce friction welding technology into the geological drill pipe''s production. The influence of different post weld heat treatment conditions on the microstructures and mechanical properties of friction welded joints between drill pipe DZ60 steel and its tie-in 40Cr steel has been discussed.Meanwhile, the microstructures and mechanical properties of friction welded drill pipes have been compared with those of hotupsetting drill pipes. As a result, the conventional mechanical properties of drill pipes'' friction welded joints have exceeded the values of geological drill pipe (DZ60)that specified by the technical criterions of Geological and Mining Department, and also are greater than that of the hot-upsetting geological drill pipes.Moreover, the results showed that the tensile strength and yield strength of friction welded joints can be improved efficiently if the appropriate tempering condition was adopted. Besides, the mechanical property values will be equal to or exceed the technical standard values of geological drill pipe (DZ60). The technology presented in this paper has been applied in practical geological drill pipe''s Production, which can simplify the post weld heat treatment condition and also reduce the production costs.