Red Seal Welding Practice Exam 2026 - Free Welding Practice Questions and Study Guide

The cleaning action in an AC cycle occurs during the positive half. This is because the positive half of the cycle has a higher voltage compared to the negative half, making it more efficient for cleaning purposes. The other options, including the negative half, zero crossing, and all through the cycle are incorrect because they do not provide the optimal voltage for effective cleaning. Additionally, the cleaning action may not occur consistently during the entire cycle, and is typically more concentrated during the positive half. Therefore, option B is the most accurate answer.