I made this as I thought I may need something to make joins for use in a vacuum that may get red hot. Epoxy and plain or silver soldering would not do. It uses a 6 V 90 A transformer and is able to spot weld a variety of mostly thin metal sheets.
“Continue reading” for more spot welder photos.
The left photo shows the hinged arm which allows two tungsten electrodes to come together. I also shows various bits of metal joined with this (very ‘art nouveau’). The flash occurs if there is a poor contact.
The right photo shows a good contact and 812 amps flowing. About 1-2 seconds later the tungsten rod was red hot. The 8 mm black cables get hot even with a few shots.
Related pages
DC spot welder The DC version uses ultracapacitors
Ultracapacitors The main article on these big capacitors
Marinov Motor Another high current device
Low voltage but high current Make your own high current supply
Pulse power Electrical explosive effects with high voltage
Try something else
Sparkler effects Similar sparkles, different method
Photographic group visit 2009 Interesting shots by expert photographers of my stuff
External links
Resistance Spot Welding Wiki
Google+ post (mine) on this AC spot welder
Google+ post (mine) on ultracapacitor related spot welding
Photo Date: 2005