Seam welding is a common technique used to increase the structural integity of production race cars. The idea is to provide extra rigidity to the body structure by adding extra welds where the sheet metal body panels come together. The factory uses just enough spot welds, seam welds, and bonding epoxy to hold the car together for road use. But the extra lateral stresses placed on the car by roadracing can allow unwanted chassis flexing.
Two seam welding techniques I was taught to use is stitch welding and rosette welding. Stitch welding is a seam weld that is started and stopped with gaps along a seam so that too much heat is not applied to the thin sheet metal used in body panels. And rosette welds are a way to weld together two panels lying on top of eachother without an ovelapping seam. You effectively create additional spots welds by drilling a small hole in the top sheet and then welding the two sheets together through the hole. My welds are pretty ugly, but getting better with practice.
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