Oh experienced ones on the board, what am I doing wrong here...

Ground electro-plate off between the panels and where the electrodes will clamp, sprayed with weld-thru primer.

Using Harbor Freight 110v spot welder, squeeze it tight, watch it glow red while I count to '7', hold it tight for a second or two, then release. After I remove my last vise grip it pops apart. All the other spot welds seemed OK but now anything welded by that Harbor Freight spot welder is suspect.

Should I have used the 220v spot welder?

deck_spotweld_harborfreight.jpgdeck_spotweld_harborfreight2.jpg

Current:'70 Barracuda 383 Gran Coupe project,
Past highlights: Datsun roadster/Olds V8, Porsche 924/buick V6, '89 IROC-Z, '00 Vette/procharged LS3, ML63, 335i, 914, 944T, '39 LaSalle sedan project