Don't worry dude, we've all been there.
Get yourself a LOT of practice.
Everything stated here is extremely valuable and take heed.
Use whatever you need and get to welding.
Experiment with the settings on different thicknesses of material.
Adjust voltages and amperages MINUTELY to notice changes in penetration, bead width and profile. Don't forget travel speeds and stickout lengths.
I'm not trying to make this seem hard. You should be doing this on your own when you are ready. This will help your learning curve as well as increasing your knowledge. Have fun with this as well.
Don't worry, you'll get it eventually. You're not gonna get it in one day or even one week.
Keep at it, and good luck!
Announcement
Collapse
No announcement yet.
amperage
Collapse
X

ok I ll surf to resource to get some information..I am new with MM252. I did not realize that MM252 require a lot with adjustable setting. I had Lincoln 135 and 180 (its set up selfautomatic) for years.
Thanks
Leave a comment:

Hey, why not try this:
Go to the resources section of this site or stop in at your local Miller dealer and get some "Weld Calculators"....
I understand that knowing the arithmetic is necessary but a lot of it is memory.
Use those calculators and you'll be off and welding before you know it.
Before long you'l memorize this stuff and have few issues.
Leave a comment:

Thanks to Helios
As a guideline, each 0.001 inch of material thickness requires 1 amp: 0.125 in. = 125 amps.
For example: I have 3/16" (0.1875) thick metal flat.
125 in per amp x 0.1875= 23.4 amps
4. Set the wire feed speed. Wire speed controls amperage, as well as the amount of weld penetration. A speed that's too high can lead to burnthrough. If a manual or weld specification sheet is not available, use the multipliers in the following chart to find a good starting point for wire feed speed. For example, for 0.030in. wire, multiply by 2 in. per amp to find the wire feed speed in inches per minute (IPM).
125 in per amp x 0.1875= 23.4 amps
1.6 in./amp X 23.4 = 37.44 IPM
Got correct???
Leave a comment:

Originally posted by Ls2cam View PostI copied from other post:
http://www.millerwelds.com/resources...dotheyfigure
http://www.millerwelds.com/resources...weldingbasics here:
1. Material thickness determines amperage. As a guideline, each 0.001 inch of material thickness requires 1 amp: 0.125 in. = 125 amps. For example: I have 3/16" (0.1875) thick metal flat.
0.001 in.of material thickness x 0.1875= 0.0001875
or
0.125 in per amp x 0.1875= 0.0234 amps
Is this makes sense?
I am bigCONFUSED on amperage.
Google "arithmetic."
If you use one amp for every .001" thickness, then just move the decimal three places to the right.
Or, just multiply the thickness of the metal (expressed in decimal inches) by 1,000.
For example, for 1/16" material (.0625") you would use 62.5 amps.
I'm not saying the rule of thumb is always right, just showing you how to move the decimal point.
Next lesson, we'll talk about topological calculus.
Good luck.
Leave a comment:

help me????
I copied from other post:
http://www.millerwelds.com/resources...dotheyfigure
http://www.millerwelds.com/resources...weldingbasics here:
1. Material thickness determines amperage. As a guideline, each 0.001 inch of material thickness requires 1 amp: 0.125 in. = 125 amps. For example: I have 3/16" (0.1875) thick metal flat.
0.001 in.of material thickness x 0.1875= 0.0001875
or
0.125 in per amp x 0.1875= 0.0234 amps
2. Select proper wire size, according to amperage. Since you don't want to change wire, select one for your most commonly used thicknesses.
* 30130 A: .023in.
* 40145 A: 0.030 in.
* 50180 A: 0.035 in. I use 0.035 wire in my MM252 right now.
* 75250 A: 0.045 in.
3. Set the voltage. Voltage determines height and width of bead. If no chart, manual or specifications are available for setting the correct voltage, you can try this: while one person welds on scrap metal, an assistant turns down the voltage until the arc starts stubbing into the work piece. Then, start welding again and have an assistant increase the voltage until the arc becomes unstable and sloppy. A voltage midway between these two points provides a good starting point.
There is a relationship between arc voltage and arc length. A short arc decreases voltage and yields a narrow, "ropey" bead. A longer arc (more voltage) produces a flatter, wider bead. Too much arc length produces a very flat bead and a possibility of an undercut.
4. Set the wire feed speed. Wire speed controls amperage, as well as the amount of weld penetration. A speed that's too high can lead to burnthrough. If a manual or weld specification sheet is not available, use the multipliers in the following chart to find a good starting point for wire feed speed. For example, for 0.030in. wire, multiply by 2 in. per amp to find the wire feed speed in inches per minute (IPM).
0.125 in per amp x 0.1875= 0.0234 amps
1.6 in./amp X 0.0234=0.03744 IPM
Is this makes sense?
I am bigCONFUSED on amperage.
Leave a comment:

so here's my deal, and i hope you guys will work with me and forgive some of my issues, i have been a welder for about 2 years but haven't welded in over a year. I'm trying to get as much refreshing information as i can before i try getting a job welding so that i can get the job.
Leave a comment:

"Modesty?"
Originally posted by Machinist View PostYou Think that's bad...Youall plum lost this farm boy welder
Dave
Leave a comment:

"Old School"
Originally posted by Rig Hand View PostThis Formula is for single pass welds with full penetration and is basically useless on thicker stuff. Sch. 40 pipe .375'' but you wouldn't weld at 375 amps. Kind of like when they say a MM210 only weld 3/8'' plate(not sure if thats true but you get the idea). The mm210 could weld 2'' plate with multiple passes, the proper joint design, and the use of a outershield wire.
I hadn't heard of Dave's formula but it works well. A good starting point for flat positions. Might lower the amps a little for out of position welds.
I don't know about the mig.
With SMAW, one can do a lot with 90130 amps, based on joint design, prep, and rod selection.
As with anyting, just "starting, or ending" points.
DaveLast edited by davedarragh; 08262009, 12:55 PM.
Leave a comment:
Leave a comment: