DIY Spot welder with time control and specs.

Announcement - Help us fight the BOTS! Please report all spam including stuff in your inbox!

J_Mack58

Member
Joined
Apr 7, 2021
Messages
68
With the hundreds of YouTube videos about making a spot welder from old microwave transformers I made one. Months ago I had already cut the secondary off the microwave transformer and threaded one turn of welding cable in its place. And there it sat for months. Last Sunday I wanted to spot weld some 18650’s. Behold, the “Frankenstein 530”. Here are the specs: With 120vac on the primary I get 1.7 vac on the secondary so a step down ratio of 70.59. When I spot weld I only measured the current on the primary which peaks at 7.5 amps. So from the law of conservation of energy, I must be spot welding with 529.4 amps. But then, I never studied law.
 

Attachments

  • ED72A9E6-435A-46FE-A57C-331A54EB49F3.jpeg
    ED72A9E6-435A-46FE-A57C-331A54EB49F3.jpeg
    1.5 MB · Views: 34
  • 4AC6592A-40B4-4166-BD45-042176F77EB0.jpeg
    4AC6592A-40B4-4166-BD45-042176F77EB0.jpeg
    1.7 MB · Views: 35
  • 49D1A913-0410-426D-999A-8037D042EAE9.jpeg
    49D1A913-0410-426D-999A-8037D042EAE9.jpeg
    1.5 MB · Views: 34
Top