What is the primary goal of using magnetic yokes in testing?

The primary goal of using magnetic yokes in testing is to achieve optimal testing conditions. Magnetic yokes are devices designed to create a controlled magnetic field in the area being inspected, which ensures that magnetic particles can be effectively attracted to any surface discontinuities present in ferromagnetic materials. This optimal magnetization improves the reliability and accuracy of the test results.

Using a magnetic yoke allows for better control over the testing environment, enabling the inspector to standardize the testing procedure and enhance the chances of detecting defects. Proper magnetization is crucial because factors such as field strength and direction directly affect the visibility of defects, making the presence of a magnetic yoke essential for achieving the best outcomes during magnetic particle testing.

Other options like reducing costs, speeding up the test, or minimizing personnel do not directly speak to the fundamental purpose of magnetic yokes, which is focused on ensuring that testing is done under the best possible conditions for defect detection.