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Spot welder - 240v breaker size?

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dcg9381

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What should be the breaker size for this 240v spot welder from Harbor Freight?
There isn't much more info in the manual, so I'd assume at 20A breaker is correct, 80% is 16A. What ends are on the "cord" of that thing what is the AWG of the cord?
 
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wazzabie

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You got more guts than me. No way would I hang onto a product from Harbor freight that needed 240V. :shocking: :shocking: :shocking:On a serious note it looks like a 20-amp 2 pole breaker would work for it.
As a kid I was shocked by 120v 15amp for a brief moment. I did not realize the light bulb outlet was energized. I still remember feeling the voltage run down my arm.
 

mm08822

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A 6-20R would need pigtails as the terminals aren't made for #8. Consider a 6-30R which will accept up to #4. This means a 6-30P on the welder cord.

What else would run off this recept?
 

The Cobbler

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Sorry to hi-jack Op, but is the unit any good Cobbler? Done any galvanized sheet metal with it?
to be honest I bought it at a discounted price as a return a few years ago with big intentions. to date I've not used it but I do have an upcoming project ( galvanized) that I intend to give it a try .
WHen I was in grade school Industrial Arts we had a spot welder. we made small barbecues out of galvanized & used it to put it together . it worked well .
 
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dave*99

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to be honest I bought it at a discounted price as a return a few years ago with big intentions. to date I've not used it but I do have an upcoming project ( galvanized) that I intend to give it a try .
WHen I was in grade school Industrial Arts we had a spot welder. we made small barbecues out of galvanized & used it to put it together . it worked well .
Be sure to have good ventilation. Zinc oxide fumes are toxic.
 

mm08822

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Seems like a poor choice of material

Be sure to have good ventilation. Zinc oxide fumes are toxic.
I agree. 1/8"/10 ga. CRS would be better. Galvanized has zinc and will gas off into your air/food as mentioned. Sheetmetal will burn through quickly as it oxidizes.

@The Cobbler There's a guy in Texas who is plasma cutting little fold up grills that looked pretty sharp. Maybe you can get ideas from similar youtube vids.
 

The Cobbler

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I know the issues with galvanized. this was a school project when I was in grade 6 or 7 .
I suspect things would be a lot different now . and most shops don't exist now. which was the better era ?
 

mm08822

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I know the issues with galvanized. this was a school project when I was in grade 6 or 7 .
I suspect things would be a lot different now . and most shops don't exist now. which was the better era ?
Since it didn't kill you the first time, give it second try?? Yikes! :scared:
 

The Cobbler

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mm08822

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curious, why did you ask the question originally? :dunno:
I asked b/c I've been considered getting a spot welder for sheet metal. Right now I have a bunch of G90 sheet metal. If I continue to play around, I'll probably continue with G90 unless painting, etc. and then maybe just uncoated steel.

The turn in your answer was not about spot welding galv sheet metal BUT rather my understanding of you making a food grill to consume product off of it. I would assume you would spend significant time around the grill while it is tox'ing off zinc etc., and you are breathing that and flavoring your meal.

I also wouldn't bother making repetitive fires in a sheet metal grill as it probably wouldn't last too long, but that's your call. (You do you!!!....just stay healthy.)
 

mike93lx

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I asked b/c I've been considered getting a spot welder for sheet metal. Right now I have a bunch of G90 sheet metal. If I continue to play around, I'll probably continue with G90 unless painting, etc. and then maybe just uncoated steel.

The turn in your answer was not about spot welding galv sheet metal BUT rather my understanding of you making a food grill to consume product off of it. I would assume you would spend significant time around the grill while it is tox'ing off zinc etc., and you are breathing that and flavoring your meal.

I also wouldn't bother making repetitive fires in a sheet metal grill as it probably wouldn't last too long, but that's your call. (You do you!!!....just stay healthy.)
Galvanizing needs to hit something like 1700 degrees before it'd a safety issue. Yes for welding but it would have to be directly in contact with a flame or coal to be a problem
 
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wazzabie

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I recall long ago someone had a demo his blacksmith forge and was working with galvanized metal. He ended up going to the hospital with metal fume fever.
 
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wazzabie

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A 6-20R would need pigtails as the terminals aren't made for #8. Consider a 6-30R which will accept up to #4. This means a 6-30P on the welder cord.

What else would run off this recept?
The line will only have one outlet. When the spot welder is not used I will plug in the air compressor. Any concerns about using a pigtail with the 6-20r?
 
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