This Post has more than one question on this TOIPC of...CD BATTERY STUD WELDER.

Comments

• HollyMinkowski Posts: 1,398

  2010-05-25 08:49 edited 2010-05-25 08:49

  It's hard to connect wires to those batteries. I was always
  scared to heat them up for several seconds to solder them because I thought the battery
  might explode or something...the metal is smooth and solder seems to hate to stick to them.
  
  I wonder if you were to sand the battery terminals with
  something like an emery board if you could then get solder
  to stick to them quickly and avoid heating the battery up
  so much?
  
  Maybe wear goggles if you try it just to be safe.
• sam_sam_sam Posts: 2,286

  2010-05-25 13:50 edited 2010-05-25 13:50

  HollyMinkowski
  
  Thank you for your reply
  
  It's hard to connect wires to those batteries. I was always
  scared to heat them up for several seconds to solder them because I thought the battery
  might explode or something...the metal is smooth and solder seems to hate to stick to them.
  
  Yes it is hard to do this because i have try this my self
  
  I wonder if you were to sand the battery terminals with
  something like an emery board if you could then get solder
  to stick to them quickly and avoid heating the battery up
  so much?
  
  I·have also try this as well and really dose not do·any better
  
  Maybe wear goggles if you try it just to be safe.
  
  I wear eye·safety glass to see and read with any way but yes to that as well
  
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• Franklin Posts: 4,747

  2010-05-25 14:16 edited 2010-05-25 14:16

  Sam, you should delete your other post.
  
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  - Stephen
• sam_sam_sam Posts: 2,286

  2010-05-25 14:31 edited 2010-05-25 14:31

  Which one would be better to use and why---->>>
  
  A··· SCR· ·or a··· TRIAC ?
  
  ·I want· to control the Power Transformer for this project with a Basic Stamp· any ··s
  
  ·
  
  Thanks to any one that can help
  
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  ·Now wanting to learn Spin· Thanks for any··that you may have and all of your time finding them
  
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  Sam
  
  Post Edited (sam_sam_sam) : 5/25/2010 2:46:12 PM GMT
• Phil Pilgrim (PhiPi) Posts: 23,514

  2010-05-25 15:27 edited 2010-05-25 15:27

  As to the batteries exploding if they get too hot from soldering, I can say from experience that yes, they do.
  
  BTW, I don't think a microwave oven transformer is what you want for this. For a welder, you need a low voltage at high current, not a high voltage at low current.
  
  -Phil
• Beau Schwabe Posts: 6,572

  2010-05-25 15:58 edited 2010-05-25 15:58

  sam_sam_sam,
  
  ...for connecting your battery terminals, try looking up 'spot welding' or 'tack welding'. The finish on the battery terminals you mention is usually Nickle, so you need a solder chemistry that is compatible with that and the wire you wish to attach. Silver solder paste is usually a good candidate for this.
  
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  Beau Schwabe
  
  IC Layout Engineer
  Parallax, Inc.
  
• sam_sam_sam Posts: 2,286

  2010-05-25 18:29 edited 2010-05-25 18:29

  Phil
  
  Yes this can be do with using a· microwave oven transformer
  
  but you have to replace the secondary winding with a· 2 - 20· turn of wire for the secondary winding··using at least a # 10· wire
  
  Here is a link that show how you can use a home made one
  
  http://www.youtube.com/watch?v=VG1xVNpm7k8&feature=player_embedded
  
  Here is a link on how you make one
  
  http://hackaday.com/2009/06/23/how-to-build-your-own-spot-welder/
  
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  ·Now wanting to learn Spin· Thanks for any··that you may have and all of your time finding them
  
  ·
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  Sam
  
  Post Edited (sam_sam_sam) : 5/25/2010 7:06:20 PM GMT
• kwinn Posts: 8,697

  2010-05-26 13:38 edited 2010-05-26 13:38

  The transformer from a soldering gun is an excellent choice for this type of resistive soldering. For safety make sure one side of the secondary winding is grounded.
• sam_sam_sam Posts: 2,286

  2010-05-26 15:13 edited 2010-05-26 15:13

  kwinn
  
  Thanks for this· ·I saw this· while reseaching for stud welders
  
  But I was not sure if this would work or not
  
  I will give this a try
  
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  ·Now wanting to learn Spin· Thanks for any··that you may have and all of your time finding them
  
  ·
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  Sam
• Peter KG6LSE Posts: 1,383

  2010-05-26 17:45 edited 2010-05-26 17:45

  I have Used MOTs for Hi Amp use [noparse]:)[/noparse] I used flat 1/4 Cu tubing with 2 layers of heatshrenaik on them .
  
  I solder My NiMh Cells with Jumbo wick or Tinned Cu braid .
  I use a solder gun to heat it up . and I use a Dremmel to get the tops clean .
  As for CD based . I woud recemend a SCR . a BIG SCR I have a 1.4kA 2.5kV one here on my desk [noparse]:)[/noparse]
  
  A lkarge Stud type would be big enough .
  
  If I had to make one I would Still use a MOT but with a Switch on the 120V side and a BIG Diode on the secondary side . the MOT with Thick wire can do 100s of amps so it sould be enough for a AA batt cell IMHO .
  
  
  
  Peter KG6LSE
  
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  LOL
  
  Post Edited (Peter KG6LSE) : 5/26/2010 5:50:35 PM GMT
• Phil Pilgrim (PhiPi) Posts: 23,514

  2010-05-27 02:56 edited 2010-05-27 02:56

  Sam,
  
  Pick up a copy of the latest (June 2010) Nuts & Volts. I just got mine today, and there's a circuit in there for a home-built spot welder.
  
  -Phil