对于小径薄壁钛管材的超声波探伤,一般采用探头固定、管材高速旋转前进的检测方式,当长度较长的管材穿过尺寸不合理的导向套时,会产生较大颤动,造成探伤灵敏度波动,影响到探伤稳定性。针对这一问题,本文通过理论分析,推导出了导向套与管材之间最大间隙的计算公式,并通过实验证明,采用该公式计算的方法选取、加工导向套来限制小径薄壁钛管材的颤动幅度,可有效提高其超声波探伤稳定性。该方法简单有效、成本低廉,具有推广应用价值。 For small-diameter thin-walled titanium pipe ultrasonic flaw detection, the general probe fixed, high-speed rotating pipe forward detection method, when the length of the pipe through the guide sleeve of an unreasonable size, there will be a large vibration, resulting in testing sensitivity fluctuations, Affect the stability of testing. In response to this problem, this paper deduces the formula of the maximum clearance between the guide sleeve and the pipe by theoretical analysis, and proves by experiment that the guide sleeve is selected and machined to limit the vibration of the small diameter titanium pipe Amplitude, which can effectively improve the stability of its ultrasonic testing. The method is simple and effective, low cost and has the promotion and application value.