Sunkko 737g battery spot welder

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  • littlejohn
    Member
    • Mar 2022
    • 21
    • Canada
    #1

    Sunkko 737g battery spot welder

    Click image for larger version Name: IMG_0285.jpg Views: 36 Size: 2.54 MB ID: 3761460 Click image for larger version Name: IMG_0272.jpg Views: 0 Size: 2.24 MB ID: 3761458 I bought this welder to spot weld some 1.5mm tabs onto batteries , which kinda worked , now I'm given some batteries that have 4.2 mm tabs that are found in Makita , dewalt and snap on battery packs . Can I modify it to do this ? The triac is a Q6040K7 which shows 6.3 vac and 36 amps output and don't know if it is accurate due to the short on time when foot pedal is triggered .
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    Last edited by littlejohn; 11-09-2025, 01:34 PM. Reason: added photo
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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31277
      • Albion
      #2
      the current is limited by the transformer.
      using a bigger fet probably wont change anything.

        Comment

        • harp
          Badcaps Veteran
          • Jun 2022
          • 647
          • Planet Earth
          #3
          Maybe if you can achieve a third wrap arround transformer, or change transformer to bigger. DiodeGoneWild (yt) has in detail explain this problem, 2 windings vs 3, voltage drop and power ratio in spot welder.

            Comment

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