AWS Welding Inspection and Testing Certification Practice Test

In which welding process is a filler material melted into the joint to connect two pieces of metal?

1. Shot welding

2. Fillet welding

3. Fusion welding

4. Arc welding

The correct answer is: Fusion welding

The process of fusion welding involves melting the base material and, in some cases, adding a filler material to create a strong bond between two pieces of metal. During fusion welding, both the edges of the metal workpieces and the filler material are brought to a molten state, allowing them to fuse together upon cooling. This method is widely used because it creates a strong, homogenous weld. In the context of the other options, while arc welding is a common technique that can utilize fusion welding principles by generating an arc to melt the filler and base materials, it doesn't specifically define the concept of melting the filler as a primary mechanism. Fillet welding describes a specific joint configuration, typically involving a weld that connects two pieces at right angles, and does not inherently address the melting of filler material. Shot welding is a distinct process that does not involve melting but rather uses mechanical means to join materials.