Spot welder? - Chevelle Tech
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post #1 of 20 (permalink) Old Jul 12th, 19, 4:54 PM Thread Starter
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Jay
 
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Spot welder?

All the threads I see are old. Has anyone tried using the 240v Harbor Freight model? I'm just looking to save some time prepping and cleaning up plug welds - for just one car. I have the 110 version but would not use it on any part of my body. It works fine for other things and thinner metal.

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post #2 of 20 (permalink) Old Jul 12th, 19, 5:52 PM
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Re: Spot welder?

I would not. Not enough amps not enough squeeze pressure.

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post #3 of 20 (permalink) Old Jul 12th, 19, 7:50 PM
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Quote:
Originally Posted by sevt_chevelle View Post
I would not. Not enough amps not enough squeeze pressure.
Correct, we have one at work, I tried it. Yunk.

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post #4 of 20 (permalink) Old Jul 12th, 19, 8:55 PM
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Re: Spot welder?

I had a miller spot welder and found that I got better results by punching holes in one peice and plug eelding the spots with my mig welder. You can make it look like a spot weld but it's much stronger. Just aim the wire straight in and make a puddle.
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post #5 of 20 (permalink) Old Jul 12th, 19, 9:01 PM
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Re: Spot welder?

Quote:
Originally Posted by Jays-68 View Post
All the threads I see are old. Has anyone tried using the 240v Harbor Freight model? I'm just looking to save some time prepping and cleaning up plug welds - for just one car. I have the 110 version but would not use it on any part of my body. It works fine for other things and thinner metal.
Try upping the voltage on your plug welds. I've found that keeping the weld hot lets it sit flush, as does starting in the middle and working your way to the top metal. A step drill (unibit) should leave less prep on the holemaking side.
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post #6 of 20 (permalink) Old Jul 13th, 19, 7:20 AM Thread Starter
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Re: Spot welder?

That's what I thought. Thanks!

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post #7 of 20 (permalink) Old Jul 13th, 19, 8:58 AM
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Re: Spot welder?

I used the HF 240V spot welder on a few panels on my car with great success.
I used weld through primer in between the panels and it did not affect the welds at all.
The best part is not having to grind all the plug welds when you are done.
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post #8 of 20 (permalink) Old Jul 13th, 19, 11:17 AM
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Re: Spot welder?

Quote:
Originally Posted by danbo View Post
I used the HF 240V spot welder on a few panels on my car with great success.
I used weld through primer in between the panels and it did not affect the welds at all.
The best part is not having to grind all the plug welds when you are done.
DITTO... I have the 240V spot welder from Harbor Freight also.. Have used all over my 70 with excellent results... For one; used it on the bottom of the quarter panels, looks same as factory; no grinding, or clean up...
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post #9 of 20 (permalink) Old Jul 13th, 19, 3:21 PM
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I have a 110v Holbart and have put rockers in with it and it done great w/weld primer being ised
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post #10 of 20 (permalink) Old Jul 13th, 19, 10:44 PM
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Re: Spot welder?

I wasted money on an HF spot welder but haven't tried it much. Looking at the electrodes, they're small compared to the factory welds we're used to seeing. I'd grind down to make the weld diameter similar, make the contact area decent and fire it up. Power is defined by the available voltage and the current source. Voltage is stepped down in the tool, and current is proportionally increased at the spot.
Essentially, the tool might or might not with tuning...
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post #11 of 20 (permalink) Old Jul 14th, 19, 10:53 AM
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Re: Spot welder?

Quote:
Originally Posted by danbo View Post
I used the HF 240V spot welder on a few panels on my car with great success.
I used weld through primer in between the panels and it did not affect the welds at all.
The best part is not having to grind all the plug welds when you are done.
WHat testing have you done to prove the strength of the welds?
Twist? Peel? what size tearout?

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post #12 of 20 (permalink) Old Jul 14th, 19, 4:35 PM
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Re: Spot welder?

Quote:
Originally Posted by TechNova View Post
WHat testing have you done to prove the strength of the welds?
Twist? Peel? what size tearout?

Wait...What...thats crazy talk.

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1970 chevelle getting Sliced and Diced Anything But STOCK
1970 chevelle SS455 not a typo its a BUICK BABY
1949 and 1972 chevy trucks
Pictures of my work

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post #13 of 20 (permalink) Old Jul 14th, 19, 10:25 PM
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Re: Spot welder?

I tested the welder on a bunch of scrap sheet metal that I had from unused portions of patch panels (floor, trunk and wheel house).
when trying to pull any of the test welds apart the metal around the spot weld would tear before the spot weld gives up.
The spot weld becomes one solid piece. you can not get it apart.
There is no question that the weld is strong enough!
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post #14 of 20 (permalink) Old Jul 16th, 19, 11:25 PM
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Re: Spot welder?

Quote:
Originally Posted by danbo View Post
I tested the welder on a bunch of scrap sheet metal that I had from unused portions of patch panels (floor, trunk and wheel house).
when trying to pull any of the test welds apart the metal around the spot weld would tear before the spot weld gives up.
The spot weld becomes one solid piece. you can not get it apart.
There is no question that the weld is strong enough!
Ditto again, I welded scrap sheet metal also... Could not make the sheet metal break a part, at the spot weld...
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post #15 of 20 (permalink) Old Jul 17th, 19, 12:11 AM
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Re: Spot welder?

I got one too, and yeah, it works....so far. I used it on some stainless and mild steel scrap before using it for anything, and I couldn't rip the welds apart. I only used it to put my heater box back together so far, but it worked fine. I got the 240V welder. It's OK for a hobby shop, but I wouldn't count on it for production, just like anything else H.F.
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