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Tool Talk Discussion Forum

Arc welder current draw

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farmallwayne

02-20-2006 19:37:24

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Hello,

I am looking at getting a lincon ac tomb stone welder.

Right now I only have 30a 220v service to my building. What current setting will I be able to run the welder at 75? 105?

If I had the welder I could stick an amp probe on it and check but I don't have it yet.

Thanks
Wayne

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herbert markle

03-13-2006 20:56:50

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

#10 annealed copper has a resistance of one ohm per thousand ft. Remember two ways, so fifty feet is one hundred total. Your connection resistnce is often more than your wire resistance. Heat dissapation (no. of wires and insulation) is a factor. If you are going to draw 50 amps on a fifty foot line, you will drop five volts in the wire itself. And, your contact resistance will at least equal that, so there goes another five. As your voltage drops into an inductive load the current generally goes up due the reduced emf. Just something to think about!? But you would be amazed what you can get away with. Just stay SAFE! Most wire current limits are given by wireing code, which are set for various reasons. If you want to know the actual resistances go to something like the tables in Eschbachs Engineering Handbook or the like. Wire resistance varies roughly as 10*logbase10*ratio of the wire sizes. You prob didn't even want to know this.

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buickanddeere

02-21-2006 06:00:14

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

If you can find some big old surplus AC power factor correction capacitor like they use on 7-1/2 and 10HP 240 motors. Or the regular power factor correction capacitors used in industrial hydro services. Enough capacitors would handle the 5 to 8 amps of reactive power. It might be enough to get you by. I've tried welding at 120 amp with 30A supply breaker. The breaker will trip if I continously burn one or more rods. The 40 amp breaker I'm on now hasn't tripped yet.

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BillD1

02-21-2006 05:57:39

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

On occasion I have had to turn a fan on the 30 amp breaker box when I was running a long hot weld.I use a dedicated circuit and a short run of wire to the welder plug

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old

02-20-2006 20:38:07

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

Years ago I ran one on 30 amp breakers and the only time they would pop is when I set it up to around 225 for cutting. Other then that it worked just fine.

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John *.?-!.* cub owner

02-20-2006 19:56:47

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

go to www.lincolnelectric.com and down load the manual, it will tell you. From my personal experience I believe you will be able to go up to 120 or a little more on it

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jdemaris

02-20-2006 19:55:10

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

Your service is good for 6600 watts. The welder can work pretty close to full capacity at that rating. If it runs on 40 volts (I'm not sure), welding at 120 amps would draw around 5000 - 5500 watts depending on the welder and if it's AC or AC/DC.

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TimV

02-20-2006 19:50:05

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

I"ve never tripped my 40-amp breaker running my AC225 at full current. Taking this as a rough max and assuming a linear current profile, then 225 / 40 * 30 would put you in the range of 165.

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Gene Davis (Ga.)

02-20-2006 19:49:11

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Re: Arc welder current draw in reply to farmallwayne, 02-20-2006 19:37:24

I have the ac/dc version of this machine and it would trip my 50 amp breaker w/ #10 wire to it occasionally if I ran it hard. Ran a #8 wire and a 70 amp breaker and have no trouble now.

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Joe(TX)

02-21-2006 05:32:01

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Re: Arc welder current draw in reply to Gene Davis (Ga.), 02-20-2006 19:49:11

The problem wasn"t the 50a breaker, it was the #10 wire, it"s only good for 30a. You had a voltage drop so it drew more current.

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chvet73

02-20-2006 20:39:48

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Re: Arc welder current draw in reply to Gene Davis (Ga.), 02-20-2006 19:49:11

Lincoln has always called for a 50 amp circuit for these. I have mine running that way and never have had a problem.

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