(1) Straight probe (usually 2.5 MHz) for ultrasonic testing of cast steel cranks with a single pulse reflection method, comprehensive detection on the plane of the journal pin, see the following figure, if necessary, the inclined probe can be used in the journal The upper shaft crack is detected.
(2) Flaw detection of the gear blank After the heat treatment, a straight probe (generally 2.5 MHz) is used for flaw detection on both end faces of the gear ring. As shown in the figure below, the defect is detected by multiple pulse reflection methods first. If there is a defect, the defect is used. A pulse reflection method is used to measure the position and distribution range of defects in the outer circle of the gear.
(3) Detecting steel blanks (natural surfaces) of steel casting blanks, which can be inspected by water glass surface hardening method (or water immersion method). This method is to first remove the surface of the steel casting, and then apply it to the surface of the steel casting with water glass. If there are small holes on the surface of the steel casting, it should be coated with thin water glass first, then the water glass with higher viscosity. Cover the surface and dry it to form a hard and smooth artificial surface. Then use oil as a coupling agent (not water) and probe with a straight or oblique probe. Water glass is alkaline, corrosive to metal and skin, should be used when using. British letter 2
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