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  • amperage

    if it's 1 amp per .001 than .250 metal thickness=250 amps does this apply to all form of welding or would that be the amperage required to achieve 100% penetration(burn through) on a flat piece of metal

  • #2
    Hold On To That Electrode!

    cliff: Take the diameter of the ELECTRODE (1/8") and the decimal (.125) would be amps , eg 125 amps. I think your equation was for 1/4" ELECTRODE (.250 = 250 amps).

    250 amps would melt 1/4" thick steel into an ingot.

    SMAW amperages are based on electrode size.

    A 1/8" 6010/6011 may run best at 90-100 amps.

    By decimalizing (is that a word?) the electrode size, gives you a "ballpark" to start with. Adjustments need to be made based on joint design, position, etc.

    Whew, you had me scared there for a minute!

    Dave
    "Bonne journe'e mes amis"

    Comment


    • #3
      amperage

      i see what about mig

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      • #4
        Mig?

        Now you're going to make me think..........

        Actually, you'll be figuring VOLTAGE more than AMPERAGE when wire welding.

        Amperage is determined by WFS (Wire Feed Speed), based on IPM (Inches Per Minute).

        If you don't have any "numbers" on your machine, you can calculate WFS by running out wire and counting to "6" (1001, 1002, 1003.......1006) measure the wire, multiply by 10, and that's how many IPM you would have.

        When TIG welding, your formula can be used to figure amperages. For example, a 1/8" thick fillet weld can be anywhere from 100-140 amps.

        Hope this didn't confuse you.

        Dave
        "Bonne journe'e mes amis"

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        • #5
          amperage

          nope thank you

          Comment


          • #6
            Originally posted by clifford544 View Post
            if it's 1 amp per .001 than .250 metal thickness=250 amps does this apply to all form of welding or would that be the amperage required to achieve 100% penetration(burn through) on a flat piece of metal
            This 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.
            '08 F-350
            Vantage 400
            SA-250
            SA-200
            Invertec V350Pro
            Invertec V205T-AC/DC

            Miller 12VS suitcase
            Miller spectrum 2050

            Pipe beveler's
            Track torch

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            • #7
              You guys type to FAST.
              '08 F-350
              Vantage 400
              SA-250
              SA-200
              Invertec V350Pro
              Invertec V205T-AC/DC

              Miller 12VS suitcase
              Miller spectrum 2050

              Pipe beveler's
              Track torch

              Comment


              • #8
                "Old School"

                Originally posted by Rig Hand View Post
                This 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.
                RigHand: Yeah, that's a real "old school" method, more on the high end max than anything else. I'm like you. The lower end works best for OP welds. Take .250 thin wall pipe, with a 1/8" 6010 root and hot pass @ 90-100 followed by a 3/32" 7018 fill and cap at the same amperage.

                With SMAW, one can do a lot with 90-130 amps, based on joint design, prep, and rod selection.

                As with anyting, just "starting, or ending" points.

                Dave
                Last edited by davedarragh; 08-26-2009, 12:55 PM.
                "Bonne journe'e mes amis"

                Comment


                • #9
                  Originally posted by Rig Hand View Post
                  You guys type to FAST.
                  You Think that's bad...Youall plum lost this farm boy welder
                  2 ea Miller Big 40 Cat cc cv Deluxe
                  1ea Miller 400P cc cv Deluxe
                  Miller Big Blue 300 Pro cc cv
                  XMT 304 cc cv
                  Miller 350P-XR-A Aluma Pro
                  Miller 30A
                  1ea X-Treme 12vs
                  2ea Miller 12Rc
                  Miller 24 A
                  Miller 330 a/bp tig
                  Dynasty 200 DX coolmate 3
                  Millermatic 180
                  Millermatic 180 auto set
                  Lincoln Invertec 350 Pro
                  Lincoln Idelarc SP 250
                  2ea Lincoln LN-25 wire feeders
                  2ea Powermax 1000
                  1ea Bortech 300z Borewelder

                  Comment


                  • #10
                    "Modesty?"

                    Originally posted by Machinist View Post
                    You Think that's bad...Youall plum lost this farm boy welder
                    Don't be so modest, from the looks of your inventory, you're more than just a ""farm boy" welder.

                    Dave
                    "Bonne journe'e mes amis"

                    Comment


                    • #11
                      Originally posted by Machinist View Post
                      You Think that's bad...Youall plum lost this farm boy welder
                      Machinist how do you like the Invertec V305?
                      '08 F-350
                      Vantage 400
                      SA-250
                      SA-200
                      Invertec V350Pro
                      Invertec V205T-AC/DC

                      Miller 12VS suitcase
                      Miller spectrum 2050

                      Pipe beveler's
                      Track torch

                      Comment


                      • #12
                        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.

                        Comment


                        • #13
                          Originally posted by Rig Hand View Post
                          Machinist how do you like the Invertec V305?
                          It's a great machine i have sticked and run a lot of different wires on it..but i love the Miller XMT 304...Both are great machines.
                          2 ea Miller Big 40 Cat cc cv Deluxe
                          1ea Miller 400P cc cv Deluxe
                          Miller Big Blue 300 Pro cc cv
                          XMT 304 cc cv
                          Miller 350P-XR-A Aluma Pro
                          Miller 30A
                          1ea X-Treme 12vs
                          2ea Miller 12Rc
                          Miller 24 A
                          Miller 330 a/bp tig
                          Dynasty 200 DX coolmate 3
                          Millermatic 180
                          Millermatic 180 auto set
                          Lincoln Invertec 350 Pro
                          Lincoln Idelarc SP 250
                          2ea Lincoln LN-25 wire feeders
                          2ea Powermax 1000
                          1ea Bortech 300z Borewelder

                          Comment


                          • #14
                            Originally posted by davedarragh View Post
                            Don't be so modest, from the looks of your inventory, you're more than just a ""farm boy" welder.

                            Dave
                            Now take it easy on me.Gotta have a little fun when resting not burning a stick.
                            2 ea Miller Big 40 Cat cc cv Deluxe
                            1ea Miller 400P cc cv Deluxe
                            Miller Big Blue 300 Pro cc cv
                            XMT 304 cc cv
                            Miller 350P-XR-A Aluma Pro
                            Miller 30A
                            1ea X-Treme 12vs
                            2ea Miller 12Rc
                            Miller 24 A
                            Miller 330 a/bp tig
                            Dynasty 200 DX coolmate 3
                            Millermatic 180
                            Millermatic 180 auto set
                            Lincoln Invertec 350 Pro
                            Lincoln Idelarc SP 250
                            2ea Lincoln LN-25 wire feeders
                            2ea Powermax 1000
                            1ea Bortech 300z Borewelder

                            Comment


                            • #15
                              help me????

                              I copied from other post:
                              http://www.millerwelds.com/resources...do-they-figure


                              http://www.millerwelds.com/resources...welding-basics 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.
                              * 30-130 A: .023-in.
                              * 40-145 A: 0.030 in.
                              * 50-180 A: 0.035 in. -I use 0.035 wire in my MM252 right now.
                              * 75-250 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 burn-through. 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 0.030-in. 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.


                              MillerMatic 211

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