What is the third type of guided bend test alongside face bends and root bends?

The third type of guided bend test, alongside face bends and root bends, is indeed side bends. In the context of weld testing, side bends evaluate the quality and ductility of the weld along the side of the weld joint. This test helps in assessing how well the weld can withstand forces when it is laterally presented, providing insights into the overall integrity of the weld.

Face bends focus on the weld's surface area, while root bends examine the condition of the weld at the very bottom of the joint. Side bends therefore complement these tests by specifically targeting the lateral strength and characteristics of the weld, allowing for a comprehensive evaluation of its quality. This is critical in determining the weld's performance in practical applications where lateral loads might be encountered.