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2. Another great way to position panels when butt welding is by using Intergrips. These panel clamps make it easy to position flat or curved panels for precise, edge-to-edge and surface-to-surface alignment, leaving an ideal 0.040-inch gap for full weld penetration. Simply clamp the panels together, tack weld, and remove for final welding, resulting in a clean butt weld that requires little grinding and is less likely to trap moisture.