During insulation installation, the pin welder's primary function is to attach insulation pins to the surface.

• A. Attach insulation pins
• B. Remove insulation
• C. Seal joints
• D. Cut insulation

Answer: (A)

The key idea here is that the pin welder is used to secure the insulation in place. It welds metal pins into the substrate through the insulation, creating a fixed anchor that holds rigid foam boards or other insulation materials to the wall or surface. This mechanical attachment is important to keep the boards from shifting during handling and while additional work—like coatings, sealants, or cladding—is applied. So the primary function is to attach insulation pins to the surface, not to remove insulation, seal joints, or cut insulation.