MM251 Welding Amps--Hobart Expert

[widetrackman]

I am spraying .035 wire , 90/10co2 @ 26v--550 ipm. Can you tell me what amps the machine is running at ? thanks

[Guest]

You're in the 220 to 250 amp range.

[Dan]

if you use the formula that Hobart /Miller expert Kevin provided us with a while back you are roughly around 280 -290 amps.

Kevin stated that one inch of .035 wire approximately = 1.9 amps

So, 550 IPM divided by 1.9 =289. This formula isn t exact but it will give you a close idea. The only way to truely know is by having an amp meter connected to the machine.

[Guest]

Dan, I got my figures from the Miller calculator...I didn't think the MM251 was capable of 290 amps

[morpheus]

http://www.millerwelds.com/products/mig/millermatic_251/

on the above page it says the following. which is confusing to me.

Rated Output
200 Amps at 28 VDC, 60% duty cycle
250 Amps at 28 VDC, 40% duty cycle

Output Power Range
30 - 300 Amps

- jack

[Guest]

Thanks, Jack

[Dan]

Originally posted by Rocky D
Dan, I got my figures from the Miller calculator...I didn't think the MM251 was capable of 290 amps

Rocky

According to Miller the MM 251 can output 300 amps.


To verify the accuracy of this formula, could you possibly run some tests at work on your machine since it has an amp meter?

[Guest]

Originally posted by Dan


Rocky

According to Miller the MM 251 can output 300 amps.


To verify the accuracy of this formula, could you possibly run some tests at work on your machine since it has an amp meter?

All I have at work is a CP 300 Miller, and it's meters aren't accurate, no 251. Besides, I may not be going back to work...I'll know in 6 weeks for sure.

[Dan]

Originally posted by Rocky D


All I have at work is a CP 300 Miller, and it's meters aren't accurate, no 251. Besides, I may not be going back to work...I'll know in 6 weeks for sure.

Rocky I knew which machine you had at work. However, I had no idea that you weren t currently working. Sorry about that.

[Hobart Expert Kevin]

Rocky D,
The Milermatic 251 is capable of producing 300 amps at about 26 volts and a 25% duty cycle.

I doubt widetrackman is running 290 amps probably closer to 250 amps. The formula I posted will get you in the ballpark but it is not an exact science.

The only way to know for sure is with an amp meter like Dan said.

Kevin

[email protected]

P.S. Rocky D. I'll be landing in Oakland Thursday morning for the Good Guys show in Pleasanton Friday - Sunday. I know it's a long ride but if you get a chance stop in. Lots of nice cars to see .

[Guest]

Thanks for the invite Kevin, but I'll have to wait till you can get to L.A. or San Diego...that's a 942.65 miles and 15hrs 24min round trip for me. Intestate 5 between L.A. and San Francisco is the most boring piece of asphalt on the planet, too. If I had Franz's money, I'd fly, but time won't permit, either.

[Dan]

Kevin

I ve been thinking about purchasing a 300 amp shunt and amp meter and setting this up in a seperate box that allows me to hook the amp meter up to any of my machines. My question is will hooking this amp meter up to my machines void the warranty?

[Hobart Expert Kevin]

Rocky D,
Maybe I'll get to L.A. for one of our service schools next year.

Dan,
You will not void your warranty by hooking an amp meter set-up to your machine as long as you don't start doing some creative wiring inside the unit.

Kevin

[email protected]

[Dan]

Originally posted by aweaver


Dan,

Why not just use a clamp on ammeter? You can get a meter with peak-hold, place it over the work clamp's cable, and weld away. When your done, check to see your peak current.

Aaron

Aaron, a clamp on amp meter only works for AC. As you know our MIG machines output DC.

[dseman]

clamp-on current meters

Dan,

Actually, clamp-on current meters are available which will measure both ac or dc current. I'm sure fluke makes them as well as others such as the extech models below:

ex-38389 600amp ac/dc current, true rms,voltage,resistance, capacitance, temp. +/- 3.5% basic accuracy. $99

ex-38095F 1000amp ac/dc current, true
rms. voltage, resistance, temp. +/1.5%
accuracy. $179

-dseman