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一、波型的选择超声波波束折射角(θ),内壁入射角(θ_1)以及壁厚(t)与外径(D)之比 t/D 存在如下关系: 当θ_1为90°时,波束与内壁相切.当θ>sin~(-1)(1-(2t)/D)时波束射不到内壁。在钢中产生纯横波(S_1)的最小折射角θ_((?)m(?)n)为:
First, the choice of wave shape Ultrasonic beam refraction angle (θ), the angle of the inner wall (θ_1) and the wall thickness (t) and the outer diameter (D) ratio t / D there is the following relationship: when θ_1 is 90 °, The inner wall is tangent and the beam does not strike the inner wall when θ> sin ~ (-1) (1- (2t) / D). The minimum refraction angle θ _ ((?) M (?) N) of pure shear wave (S 1) in steel is: