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Cheap Welding for Punks

Step 6Battery Spoolgun - Flux Core Wirefeed

Battery Spoolgun - Flux Core Wirefeed
Welds Steel
Cost: $75 and up.
see the entire DIY Battery SpoolGun instructable.

Wirefeed is very easy to use. A lot like a gluegun. Just point it at the pieces you want joined and pull the trigger.
Flux-core wire means you don't need a shielding gas cylinder. The fluxcore wire I've used has deposited very thin slag. Not much work to brush it off. Fluxcore wire costs $4/lb and up.

Cheap fluxcore wirefeed welders are abundant in hardware stores and used on craigslist.
For even less cost on ebay you can get a spoolgun and run it on car batteries. Old car batteries will put out as much current as a very expensive welder.

Control welding heat with distance from the gun to the weld. Close in is a short low resistance wire - more current and heat - melt it in. Further out - longer wire - more resistance - less heat and a puddle that builds up higher.



To weld stainless steel and aluminum you'll need shielding gas.
For ~$200 you can add a gas cylinder and regulator.
Different materials require different shielding gases.

Thin walled materials such as tubing require skill.
You must look up wire diameter, feed rate, and voltage to get a good weld and not burn holes.
You must look up and do everything exactly right to weld aluminum.

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9 comments
Jan 2, 2010. 9:01 PMgold03 says:
The battery welding technique is used in the field by guys who are four wheeling, and break stuff off their truck like shocks or springs. I have seen a drive shaft repaired in the field using exhaust tubing and batteries. 

This is an emergency fix to get you back to civilization where a nice, neat, strong repair can be made.

Everyone who wanders the earth, should know this particular skill.
Feb 4, 2010. 11:37 PMabadfart says:
iv seen it done with a spare alternator for work on remote areas 
May 22, 2011. 11:09 PMskaar says:
http://myweb.cableone.net/rschell/TIG.htm here's a setup that uses an alternator...
Dec 13, 2008. 9:37 PMReeper says:
so, can you make nice welds with that gun. when you start welding your wire is about 2 inches out of the electrode, it is suggested to be about 3/8 to 1/2 max or it makes those globes that you can see in the video. I dont know if your ticketed or not but the welds didn't look too sweet, but the welding off of batteries is a cool idea. Whats the duty cycle so you don't blow the batteries up?
Jun 11, 2009. 9:49 AMskaar says:
i frequent the origamiboat yahoogroup, and the old hands/farts say that to weld aluminum you crank the amps, move fast, the weld sounds like you're spraying, and you get perfect welds every time. i've been meaning to take up welding again, and was wondering, since it's been a while, if there's a particular sound that properly done steel welding makes.
May 22, 2011. 8:21 AMicej75 says:
It should sound like frying bacon when you're in the zone.
Dec 21, 2008. 11:18 AMReeper says:
off topic from your Instructable, do you think that non spatter spray works?
Dec 10, 2008. 9:48 PMscafool says:
About how many inches of bead can you run off two fully charged norma sized batteries?
Dec 12, 2008. 10:48 AMAstinsan says:
That would be hard to figure out. Your load is always going to be changing because of the distance from the ground and the distance of wire being feed to the arc. It would still be cheaper to get a ac welder than to buy a bunch of deep cycle batteries and a welding attachment.
Dec 14, 2008. 5:13 AMscafool says:
I agree on the cost unless you were using scrap batteries, and even then you need to charge them. His idea of using a solar charger makes a bit of sense there, but it still seems like pretty high cost solution.

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Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
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