Red Seal Sheet Metal Worker Practice Exam

What type of joint is formed when two pieces of sheet metal are joined with a lap joint?

1. Butt joint

2. Overlapping edges

3. Edge joint

4. Corner joint

The correct answer is: Overlapping edges

A lap joint involves joining two pieces of sheet metal by overlapping them and securing the edges together. When describing this joint, it is essential to note that the primary mechanism is the overlapping of the edges of the metal sheets, which allows for a strong connection between the pieces. This type of joint is widely used in various applications, as it provides good strength due to the added material contact and allows for effective welding or fastening. Butt joints, on the other hand, are formed when the edges of two sheets are aligned and joined directly without any overlap. Edge joints refer to two pieces of metal that are aligned along their edges. Corner joints are created when two pieces are joined at an angle, typically at a 90-degree connection, which is different from how a lap joint functions. Understanding the characteristics of a lap joint is crucial for sheet metal work, as it can impact the strength and integrity of the final assembly.