钢齿牙轮钻头齿面强化复合堆焊实验研究

运用自制的包含金属化的金刚石和硬质合金复合堆焊焊条，以O₂-C₂H₂焰为焊接热源进行堆焊，制备了含有金刚石的复合堆焊层。采用X射线衍射仪（XRD）、光学显微镜、材料性能实验机、动载磨料磨损实验机等实验手段和方法进行了金刚石表面和复合堆焊层形貌分析，堆焊层与基体的结合强度及堆焊层在动载荷条件下耐磨损性能的测试。研究表明：金刚石经过金属化处理后表面具有一定的金属性和浸润性，通过一定堆焊工艺在钢齿牙轮钻头齿面形成了组织致密均匀、硬质点与基体熔合良好的强化层，其抗剪强度达到了625MPa，磨损量减少了10％～70％，延长了钻头的使用寿命。

EXPERIMENTAL STUDY ON COMPOSITE REPAIR WELDING ON STRENGTHENING THE SURFACE OF STEEL TOOTH ROLLER CONE BIT

Composite repair welding layers with diamond are obtained by Repair Welding with Composite welding rod containing diamond and Carbide through O₂-C₂H₂ flaming.Morphology of composite repair welding layers and diamond surface after metalizing are analyzed with optical microscope and XRD，and bonding strength between repair welding layers and substrate and wear resistance of repair welding layers are tested by material testing machine and abrasion tester.The results show that diamond surface after metalizing has certain metallicity and wettability.The complex layers are compacted and wellproportioned，the shear strength of which is 625MPa and wear value is reduced by 10%～70%.The complex layers prolong the working life of steel tooth roller cone bit.