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

The fillet weld is specifically designed to join two pieces of metal at a 90-degree angle, making it an ideal choice for corner and lap joints. This type of weld creates a triangular cross-section that fills the space between the two metal pieces, providing substantial strength and stability to the joint. Its geometry allows it to effectively accommodate the angled connection, which is often required in structural applications.

In contrast, a butt weld connects two pieces of metal along their edges, making it less suitable for joining components at a right angle. A lap weld involves overlapping the pieces and welding along the edges, which does not specifically target the 90-degree angle connection. The T-groove weld is used for a different type of joint configuration, where one piece of metal is perpendicular to another and fits into a groove, but it does not create an effective joint for a straightforward 90-degree angle as the fillet weld does. Therefore, the fillet weld is the most appropriate choice for this type of joint.