I was going to suggest this. Should be similar to the DIY "taser" made with the camera flash. Not really a taser would work great for a wire welder imo, at least for small gauge wire we use. Fills compacitor and releases current at once... Let us know if you go this routeI've seen some plans to build one using a flash pcb out of a disposable camera... I might do that if I don't find one soon. I'm guessing a ready made one should be relatively inexpensive? But hey, what do I know.