Which welding technique is used to join two pieces of metal at right angles?

• A. Lap welding
• B. Fillet welding
• C. Butt welding
• D. Surface welding

Answer: (B)

Fillet welding is the appropriate technique for joining two pieces of metal at right angles, particularly useful in applications such as pipefitting and structural fabrication. This method involves creating a triangular cross-section weld, which fits into the corner formed by the intersecting pieces, providing a strong joint that can handle various loads and stresses.

Fillet welds can be applied efficiently in situations where the pieces being welded intersect perpendicularly, such as a vertical pipe to a horizontal beam. The versatility and strength of fillet welding make it a popular choice for many construction and manufacturing processes.

The other welding techniques mentioned have specific uses in different contexts. For example, lap welding is more suited for overlapping joints where materials are laid over each other rather than at right angles. Butt welding is typically utilized for joining two pieces of metal end-to-end and does not apply to right-angle joints. Surface welding is primarily used for coating or cladding surfaces rather than creating an angle between two pieces. This distinction underscores why fillet welding is the correct answer for creating strong joints at right angles in various metalworking scenarios.