When only one part of a joined assembly is hot enough during brazing, what will happen to the filler metal?

When only one part of a joined assembly is hot enough during brazing, what will happen to the filler metal?

• A. It will bond to both pieces
• B. It will flow only on the hot piece
• C. It will not flow at all
• D. It will contact the cooler piece

Answer: (B)

When only one part of a joined assembly reaches the necessary temperature for brazing, the filler metal will primarily flow and adhere to the hotter piece. This is because the effective bonding of the filler metal relies on the heat to create a molten state that facilitates movement and adhesion. If one component is sufficiently heated, it can help to melt the filler metal, allowing it to flow towards that area due to capillary action. However, since the cooler parts do not reach the required temperature, they do not effectively participate in the alloying process. The colder piece does not provide the right conditions for the filler metal to adhere or flow towards it, resulting in the filler metal being localized to the hotter area. In a successful brazing operation, uniform heating across both components ensures that the filler metal can flow effectively and create strong joints. Without adequate heat on all components, the filler metal will tend to remain concentrated where the heat is applied, leading to a weak joint or inadequate bonding if insufficient connection occurs with the cooler piece.

When only one part of a joined assembly reaches the necessary temperature for brazing, the filler metal will primarily flow and adhere to the hotter piece. This is because the effective bonding of the filler metal relies on the heat to create a molten state that facilitates movement and adhesion.

If one component is sufficiently heated, it can help to melt the filler metal, allowing it to flow towards that area due to capillary action. However, since the cooler parts do not reach the required temperature, they do not effectively participate in the alloying process. The colder piece does not provide the right conditions for the filler metal to adhere or flow towards it, resulting in the filler metal being localized to the hotter area.

In a successful brazing operation, uniform heating across both components ensures that the filler metal can flow effectively and create strong joints. Without adequate heat on all components, the filler metal will tend to remain concentrated where the heat is applied, leading to a weak joint or inadequate bonding if insufficient connection occurs with the cooler piece.