What is a Lap Joint in Welding?

A lap joint is a weld between two overlapping members in parallel planes. The most common type of lap joint is the T-joint, where the two pieces to be joined are at right angles to each other.

What is a lap joint used for?

Lap joints are used when it is not possible or practical to butt the two pieces together. They are also used to add strength to a joint or to provide more area for welding.

Lap joints can be welded from åeither side, but it is usually easier to weld them from the top. This allows the welder to see what he is doing and to get at the root of the joint more easily.

Lap joints are not as strong as butt joints, but they can be made stronger by adding reinforcement in the form of a fillet weld or bar.

Is a lap joint a fillet weld?

A lap joint is not a fillet weld. A fillet weld is used to join two pieces of metal at right angles to each other. A lap joint is used to join two pieces of metal in parallel planes.

Types of lap joint welding

There are three types of lap joint welding:

T-joint.
Butt joint.
Corner joint.

Lap weld pipe

Lap welding is used to join pipes together. The most common type of lap joint for pipes is the butt joint, where the two pieces to be joined are at right angles to each other.