Instructables

Portable Welder

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I was interested in a "portable welder".  I started investigating and I found a few gas and propane driven models from $699+

I then found a great Instructable that started me thinking in a different way: http://www.instructables.com/id/SpoolGun/

Instead of a gas generator powered welder, I could use a 24V DC battery powered welder system; based around a spool gun.

I currently own a Lincoln 175HD 208V [220V AC circuit] welder which can weld aluminum via its push-wire gun, but it requires changing out a liner in the gun's cable so that the wire doesn't "birds nest" [bunch up] in the feed tube.  Needless to say, it raises the threshold of "what's worth the trouble" of switching everything out.  Lincoln now makes a separate spool gun that works with the newer models of Lincoln welders, but not with my 175HD.  I found a great "retrofit" website on how to wire the spool gun for use with my welder.  Having a spoolgun that I would use for aluminum welding, and the push-wire gun for other wire types, would lower that threshold, and I could also use the spoolgun for my portable welder idea.

So while Tim Anderson's great Instructable is based around a generic spoolgun that he found on ebay [priced in the $135-$150 range], I decided to go with the Lincoln Electric Magnum 100SG Spoolgun [priced in the ~$222 range] so that I could use it with both my existing AC powered welder and the DC welder that I had in mind.

Complexity:  Intermediate, requires:
  • knowledge of welding
  • knowledge of DC electronic circuitry
  • experience with High Amperage vehicle batteries

Safety: *Special precautions*
  • I am not a professional certified welder nor electrician, so understand that you (like I did) assume all responsibility and liability for attempting to [re]create this project.
  • Not going to get into the whole Edison vs. Tesla debate of the safety of DC vs AC, but for this specific project, DC is relatively safe.  Relatively in that you won't get "shocked", but the arc from high amperage DC current releases various gasses, radiation, and produces enough heat to seriously burn, even maime.
  • While welding, make sure you use protective gear and cover your skin.  A DC arc can generates molten metal slatter, enough ultraviolet radiation to give you a sunburn, and can permanently damage your retina if viewed with the naked eye.  Be cautious of any spectators/bystanders
 
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rimar20001 year ago
Excellent useful info, thank for sharing!
ZacWolf (author)  rimar20001 year ago
Thank you very much! This was one of the few projects that moved from experiment to project on the first try! Plugged it in, pulled the trigger and it welded! :)
JordanRinke10 months ago
Any estimate on run time with a fresh or fully charged pair of batteries?
ZacWolf (author)  JordanRinke10 months ago
I went through 1/2 lb of wire with no discernible drain on the battery. I wired them back in parallel and started the engine right away. I use a series of solar panels (just 45watta) to keep the batteries topped up. Haven't had a need to weld any longer in one go.

Very cool, thanks for the reply and fantastic instructable.
Wow! Well done! You have a great skill set to DIY this!
ZacWolf (author)  diykiwibloke1 year ago
Thanks! I'm a computer programmer (started in computer engineering, so have some basic electronics knowledge), and my father is a retired machinist and welder. He taught me the basics.

I consider myself a Zac-of-all-trades, so pretty fearless about trying new things. Only had one all-out DIY failure (water cooling a computer of all things, but I tried for WAY too much for my first such project).

I've got a few Instructables planned for the year. I reworked and updated an older Instructable: Survival Kit Shotgun, I just have to get it recorded.

I'm also going to start some extensive mod'ing of my hummer H2, and a possible HUD for my motorcycle helmet now that transparent OLEDs are coming down in price.