1.前言 102型轨道车后轴齿轮箱部位距轴端915mm处(见图1),在扭转弯曲的交变应力作用下,很容易产生疲劳裂纹。这些裂纹如不能及时发现,将危及行车和人身安全。 2.探伤条件 (1)探头:采用K1.5～2或45°～50°(入射角)的斜探头。 (2)探头频率:2.5MHz。 (3)探测面:轴身(见图1)。 (4)耦合剂:轴身表面粗糙的可采用黄油,轴表 1. Preface 102 rail car rear axle gear box parts from the shaft end 915mm Department (see Figure 1), under the action of alternating bending torsion bending, it is easy to produce fatigue cracks. If these cracks can not be found in time, they will endanger driving and personal safety. 2. Detection conditions (1) probe: the use of K1.5 ~ 2 or 45 ° ~ 50 ° (angle of incidence) of the oblique probe. (2) probe frequency: 2.5MHz. (3) detection surface: axis body (see Figure 1). (4) Coupling agent: Shaft surface roughness can be used butter, shaft table