Millwright Level 1 Practice Exam

What distinguishes braze welding from traditional welding?

1. It requires no heat

2. Filler metal is built up on the surface

3. It is performed at lower temperatures

4. Only solid forms are used

The correct answer is: Filler metal is built up on the surface

The distinguishing feature of braze welding is that it involves the use of a filler metal that is applied to the surface of the materials being joined. This method allows for the creation of strong bonds without melting the base metals. In braze welding, the filler metal melts and flows into the joint by capillary action, bonding to the surfaces upon cooling. This characteristic sets braze welding apart from traditional welding processes, which usually involve melting the base metals themselves to create a fusion bond. While other options present interesting concepts related to welding, they do not accurately capture what primarily differentiates braze welding. For instance, braze welding is indeed performed at lower temperatures compared to some welding methods, but this only partially describes the process. Additionally, the reference to solid forms and the idea that it requires no heat are misleading in the context of braze welding; although it operates at lower temperatures, some heat is still necessary to melt the filler metal properly. The critical aspect remains the methodical application of the filler metal on the surface, which is essential to achieve a solid and effective bond.