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轴锻件进行超声探伤,声束的取向决定于锻件流线的图形(由锻造工艺决定的)如图1所示。一些缺陷如夹杂裂纹等的延伸大多沿流线方向,探伤声束应尽可能与流线方向正交。因而声束平行于大轴轴线的纵向探伤,除非对于大的横向裂纹,一般不是很有益的。而这种裂面基本与大轴轴线正交的横向裂纹,从柱面用折射角等于或大于45°的斜探头也可以探出如图2所示。可见对于轴锻件探伤,基本上用直、斜探头在柱面上进行即可。
Shaft forging ultrasonic testing, sound beam orientation is determined by the forging streamline graphics (by the forging process) as shown in Figure 1. Some defects, such as cracks and other inclusions are often extended along the streamline direction, the sounding beam should be as orthogonal to the streamline direction. Longitudinal testing of the sound beam parallel to the axis of the large shaft is therefore generally not very beneficial, except for large transverse cracks. The transverse cracks, which are basically perpendicular to the axis of the large shaft, can also be extracted from the cylinder by means of an oblique probe having a refractive angle equal to or greater than 45 ° as shown in FIG. 2. Visible for shaft forging flaw detection, basically straight, oblique probe on the cylinder can be carried out.