Differentiate welding from brazing and indicate suitable material scenarios for each.

Differentiate welding from brazing and indicate suitable material scenarios for each.

• A. Welding fuses base materials with heat; brazing joins with a filler metal without melting the base metals; welding is typical for steels and aluminium with proper parameters; brazing good for dissimilar metals or heat‑sensitive components.
• B. Welding fuses base metals with heat; brazing fuses base metals with heat.
• C. Brazing fuses base metals; welding uses filler metal.
• D. Welding is never used on aluminium.

Answer: (A)

Welding and brazing differ in how the joint is formed. Welding fuses the base materials by applying heat until they melt and join together, often with a filler metal added, so the original metals become part of the molten pool. Brazing, on the other hand, uses a filler metal that melts and flows into the joint while the base metals stay solid; there’s no melting of the workpieces themselves. This distinction explains why welding is commonly used for steels and aluminium when the heat input can be carefully controlled to avoid excessive distortion and to achieve a strong, integral joint. Brazing is advantageous for joining dissimilar metals or heat‑sensitive components because the base metals aren’t melted, reducing the risk of weakening or warping and allowing joints that would be difficult with fusion welding. So, the description matches the idea that welding fuses base materials with heat, brazing uses a filler metal without melting the base metals, welding is typical for steels and aluminium with proper parameters, and brazing is good for dissimilar metals or heat‑sensitive parts.

Welding and brazing differ in how the joint is formed. Welding fuses the base materials by applying heat until they melt and join together, often with a filler metal added, so the original metals become part of the molten pool. Brazing, on the other hand, uses a filler metal that melts and flows into the joint while the base metals stay solid; there’s no melting of the workpieces themselves.

This distinction explains why welding is commonly used for steels and aluminium when the heat input can be carefully controlled to avoid excessive distortion and to achieve a strong, integral joint. Brazing is advantageous for joining dissimilar metals or heat‑sensitive components because the base metals aren’t melted, reducing the risk of weakening or warping and allowing joints that would be difficult with fusion welding.

So, the description matches the idea that welding fuses base materials with heat, brazing uses a filler metal without melting the base metals, welding is typical for steels and aluminium with proper parameters, and brazing is good for dissimilar metals or heat‑sensitive parts.