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5 At the factory, metal parts were assembled using massive spot weld guns. For the at-home guy, plug welding can be used to simulate factory spot welds. Plug welding is sometimes the best option for attaching panels anyway, especially where you have “tabs” or bends butting up next to other panels. Here, we’re using a pneumatic punch to make holes along the rocker side of our floorpan for attachment to the rocker.