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Those little circles of steel aren't spots; they are puddles of strength holding your world together. Do you have a horror story of a plug weld that failed, or a trick for getting them perfect every time? Let us know in the comments below!
Instead of welding the outside edges of the overlap (which can look messy and trap moisture), you drill or punch a hole in the top sheet. You then direct your welding arc into that hole, creating a "puddle" of molten metal that bonds the top sheet to the underlying parent metal. When you finish, the hole is filled flush with weld metal. puddle weld
When most people picture a weld, they imagine a long, glowing bead tracing a seam between two plates of metal. But in the worlds of auto manufacturing, shipbuilding, and heavy fabrication, there is another, less glamorous but equally critical player: the puddle weld (also known as a plug weld or a rosette weld). Those little circles of steel aren't spots; they
