___ repair does not involve a significant heat input.

___ repair does not involve a significant heat input.

• A. Mechanical
• B. Welding
• C. Brazing
• D. Soldering

Answer: (A)

The concept here is heat input in repair methods. A repair that does not involve significant heat input uses mechanical means—fasteners like bolts, clamps, pins, rivets, or press fits, and alignment or shaping of parts—so nothing is melted or fused. This keeps the metal at or near its original temperature. In contrast, welding uses high heat to fuse materials, brazing relies on melting a filler metal with heat to bond surfaces, and soldering uses heat to melt a filler metal at a lower temperature but still involves heating the joint. So mechanical repair is the option that doesn’t involve significant heat input.

The concept here is heat input in repair methods. A repair that does not involve significant heat input uses mechanical means—fasteners like bolts, clamps, pins, rivets, or press fits, and alignment or shaping of parts—so nothing is melted or fused. This keeps the metal at or near its original temperature. In contrast, welding uses high heat to fuse materials, brazing relies on melting a filler metal with heat to bond surfaces, and soldering uses heat to melt a filler metal at a lower temperature but still involves heating the joint. So mechanical repair is the option that doesn’t involve significant heat input.