一、概述 我厂生产的解放排气门是21一4N与4Cr9Si2材料用闪光焊接而成,该气门经常在高温下承受压力、拉力做往复运动。气门质量的好坏不但直接影响发动机马力,而且会导致发动机气缸、活塞、连杆等机件的损坏,因此气门质量是保证发动机正常工作的重要条件之一。几年来我们对这种双金属对焊排气门焊缝超声波探伤进行了探索,从用平探头、斜探头、到水浸超声波探伤分别进行了试验,到目前为止,我们认为水浸超声波探伤细棒料对接焊缝质量的检测比较理想。 水浸超声波探伤的优点: I. Overview I plant the liberation of the exhaust valve is 21 a 4N and 4Cr9Si2 flash welding materials made of the valve often under high temperature under pressure, the tension to do reciprocating motion. Valve quality is good or bad will not only directly affect the engine horsepower, but also lead to engine cylinder, piston, connecting rod and other parts of the damage, so valve quality is one of the important conditions to ensure the normal operation of the engine. Over the past few years, we have explored the ultrasonic flaw detection of such bimetallic brazed exhaust valve welds, from the flat probe, oblique probe to the ultrasonic testing of water immersion were tested, so far, we believe that water immersion ultrasonic flaw detection Butt weld bar quality testing ideal. Water immersion ultrasonic flaw detection advantages: