Which tool is used to attach insulation pins to a surface during insulation installation?

• A. Hammer and nails
• B. Soldering iron
• C. Pin welder
• D. Spot welder

Answer: (C)

Attaching insulation boards securely relies on fasteners that actually become part of the surface. Insulation pins are designed to be welded to the substrate, so the strongest, most reliable method is to use a pin welder. The pin welder delivers a brief, high-current pulse that fuses the pin to the surface, creating a solid, durable hold without damaging the board. This is faster and cleaner than hammering in pins, and it provides far more holding power than a soldering iron could, while being more specifically suited to this task than a general spot welder.