What is the Difference with a fillet weld and groove weld?

A fillet weld is a triangular weld that joins two surfaces at a right angle, typically used in lap or corner joints, while a groove weld involves a joint that has been prepared with a specific shape to allow for full penetration and strength, often used in butt joints. Fillet welds are generally easier to apply and require less preparation, whereas groove welds can handle greater loads and are used in thicker materials. Additionally, groove welds can be further categorized into different types based on their shape and the welding process used.