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While the perimeter was welded, Aschtgen periodically returned to the sail panel and added spot welds, allowing them to cool. By the time the rest of the quarter-panel was welded, the sail panel had one continuous weld. Here, the welds on the sail panel are being ground flat using a 40-grit sanding disc. During grinding, as with the welds, periodic cooling with a damp cloth is a must to avoid warpage. View Related Article
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