How do I calculate heat weld? Kurt Wilson December 21, 2017 19:48 Updated Follow Watch this brief tutorial that explains how to calculate heat weld seams. Related articles How do I figure a border with flash coving? Table of Contents How do I create a herringbone pattern? How do I re-scale my drawing? How do I work with Rhombus and Parallelogram Tile Shapes? Comments 0 comments Please sign in to leave a comment.