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Unread 03-20-2011, 01:02 PM   #1
Yury
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1998 TJ Wrangler 
 
Join Date: Dec 2008
Location: New York
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HF welder rewiring qustion

Hey guys

Just got a 90 amp welder from HF. It was 89 bucks I couldn't control myself. It's rather nice for small projects and once you put a decent wire in it lol. The only thing is I'm not crazy about the constant flow. I was wondering if there's a way to rewire the welder to only have current flow when the trigger is pressed. Anybody done this?

Thanks in advance

Yury

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Unread 03-20-2011, 01:21 PM   #2
Kettles
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Quote:
Originally Posted by Yury View Post
Hey guys

Just got a 90 amp welder from HF. It was 89 bucks I couldn't control myself. It's rather nice for small projects and once you put a decent wire in it lol. The only thing is I'm not crazy about the constant flow. I was wondering if there's a way to rewire the welder to only have current flow when the trigger is pressed. Anybody done this?

Thanks in advance

Yury
I wish I still had the transformer and lower half of my old 90amp HF welder to look at. I would guess the best way would be to wire some type of heavy duty solenoid into the power line, and tap into the trigger control wires to control the solenoid in adition to the wire feed motor.

I also know that the HF line of welders are quite popular to mod, being they are so cheap. You could try google searching "cold tip HF 90amp" or something like that.
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Unread 03-20-2011, 01:23 PM   #3
Yury
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Quote:
Originally Posted by Kettles

I wish I still had the transformer and lower half of my old 90amp HF welder to look at. I would guess the best way would be to wire some type of heavy duty solenoid into the power line, and tap into the trigger control wires to control the solenoid.
I was thinking something on the same line. Just don't know how to go about it safely.
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Unread 03-21-2011, 11:24 AM   #4
sherlocktk
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Ok Guys here you go. This diagram is "scavanged" so it looks a little un-refined from my battery mig thread here.
You can see more diagrams so you can get the idea.

http://www.jeepforum.com/forum/f37/h...79/index2.html

As far as soleniod a constant duty 12v starter solenoid will work just fine. (29volts gets halved and looses 1.4 volts, so halved is 13.8 volts DC or so)

You also need a rectifier (I recommend around 5 amp+) and a capacitor. Just buy the biggest one you can find at radio shack and you will be fine. Probably about 5-6 dollars at radio shack

See attached diagram (that was slightly re-worked the capicator has nothing to do with the motor speed control)
hf-colt-tip.jpg  
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