Ultrasonic Straight Beam Testing
Ultrasonic zero-degree testing is a method for detecting flat cracks and separations in metals using longitudinal waves. It is used before weld preparation to inspect the base material.
Physical-Chemical Mechanism
Ultrasonic zero-degree testing uses longitudinal waves that are coupled in perpendicular to the entry point. These waves reflect off flat cracks and separations in the material and are picked up by a receiver.
Metallurgical Relevance & Welding Risks
This testing helps detect flat cracks and separations that can affect weldability. Unknown or untreated defects can lead to cracks in the weld, compromising the safety and durability of the component.
Shop Practice & Action Items
Before testing, the workpiece must be clean and dry. The ultrasonic beam should be coupled perpendicular to the flat cracks. The wave frequency is typically 2.5 MHz for steels. A reflection indicates a flat crack or separation. Record the results thoroughly and share them with the customer.