What is a lap joint in soldering and brazing?

A lap joint in soldering and brazing involves two overlapping pieces of material that are joined together, which significantly increases the surface area available for bonding. This design is beneficial because it enhances the strength of the joint, allowing the filler material to create a more substantial and secure connection between the two pieces. The overlap means that there is more contact area for the solder or brazing material to adhere to, which can help distribute stress more evenly across the joint.

In practical applications, lap joints are often used where strength and durability are necessary, as they can withstand challenging conditions. Additionally, the method of applying heat can be more effective on lap joints since the excess thickness of material can accommodate the heat needed for effective soldering or brazing, promoting better filler flow and penetration.

The options that refer to flat materials with no overlap, welded joints, or edge-to-edge alignment do not capture the essential characteristic of a lap joint, which is the overlapping nature that facilitates better bonding through increased surface area.