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I have this 230v MIG welder. The chart provided does not address .035 non-flux wire. I have a roll of .035 and need to weld .135 thick pipe tomorrow (part of a show bar) and would appreciate some advice on voltage and speed. The machine is only labeled in voltage A - E and wire speed 0-10.I do not have any .030 on hand. I am using 75/25 gas. My liner is a .035 liner and I have .035 contact tips. I tried .023 on this today but it did not give me good penetration or fill.Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Is there a # on the fluxcore? I would start with a slower speed and medium voltage. Is it gassles or self shielding wire? Gasless is - electrode. DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:Thanks! That is where I was going to start if no one could help. I am not sure about your wire terminology. The wire is solid with a copper coating, "typical" wire for use with gas shielding. It is Weldmark GB74 Precision Feed wire. The Heat Nr. the .035 wire is 0529410. The Alloy is AWS AS.18-79, ER70S-6.Yes, there is a setting for .035 flux wire. I am trying to use .035 solid wire (no flux) with 75/25 Argon/CO2 mixed gas to weld this up. The larger piece is .135-.138 walled tube and I am butt welding it to a slightly smaller diameter tube of the same wall thickness. Slightly means less than .050 difference.Last edited by Rob Page; 08-05-2007 at 09:43 AM.Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:OK, change in plan. For .035 and gas, turn the voltage to the top or one less and set wire speed to weld with that setting probably about 4 as a guess. You should get good penetration. Electrode + . Adjust by feel from there. 15 Cfh gas. 3/8" stickout. .135" plate = aprox 135 amps. Acording to my calculator, that should be 215 ipm for .o35 and 270 for .030 . I don't know the factor for .023.DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:Calculator? I know about the 1 amp per 1000th rule but what is this calculator?? Help a noobie here! Thanks!RobRob PageMiller Bobcat 250Lincoln SP170-T
Reply:I got this from miller or Esab, I can't remember which. .045 wire will use about one amp per ipm. There are curves on the chart, but its just a guide anyhow..035 wire takes 1.6 ipm to use one amp..030 uses two inchs to to use one amp.David Real world weldin. When I grow up I want to be a tig weldor.
Reply:Lincoln recommends Tap E and setting 7.5 for .030 on C25 Gas and 10ga steel. So for your suggestion it look like Tap E and just under 4 for line speed. Great!! Thanks for your help. I see the light, I hope that is a light....A little testing of the machine reveals the following:Tap - (vdc) a = 17.6 b = 20.6 c = 24.4 d = 28.6 e = 33.6Wire Speed - inches per minute (variable 1-10.5) min - 77 1 = 79 2 = 121 3 = 176 4 = 220 5 = 280 6 = 337 7 = 374 8 = 392 9 = 407 10 = 420 (interpolated) max = 440Hopefully this will help other owners of this machine.Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Originally Posted by Rob PageLincoln recommends Tap E and setting 7.5 for .030 on C25 Gas and 10ga steel. So for your suggestion it look like Tap E and just under 4 for line speed. Great!! Thanks for your help. I see the light, I hope that is a light....A little testing of the machine reveals the following:Tap - (vdc) a = 17.6 b = 20.6 c = 24.4 d = 28.6 e = 33.6Wire Speed - inches per minute (variable 1-10.5) min - 77 1 = 79 2 = 121 3 = 176 4 = 220 5 = 280 6 = 337 7 = 374 8 = 392 9 = 407 10 = 420 (interpolated) max = 440Hopefully this will help other owners of this machine.
Reply:Are these open circuit voltages? When you are welding, the voltage will drop. DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RAre these open circuit voltages? When you are welding, the voltage will drop. David
Reply:Yes, these were open voltages. Would I be better serve measuring the voltages while welding? Wouldn't the wire size affect these readings as well as the arc length? Ran it on E and 4 today and it seemed hot to me. It got too dark to continue, but I did get the Roll bar tacked into position and removed for final welding tomorrow evening. I will try it tomorrow on D.4 and see what happens. Hard to tell if it is me or the settings!!!Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:OK, here are These are the averages of 3 short beads with a good arc going. A little difficult at the lower voltages!!Tap - (vdc) Open Loaded a = 17.6 12.5 b = 20.6 14.5 c = 24.4 16.5 d = 28.6 17.4 e = 33.6 18.8Now, how do I use this information to make better decisions on where to start as far as voltage/wire speed vs. material/conditions?Thanks!!Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Originally Posted by Rob PageOK, here are These are the averages of 3 short beads with a good arc going. A little difficult at the lower voltages!!Tap - (vdc) Open Loaded a = 17.6 12.5 b = 20.6 14.5 c = 24.4 16.5 d = 28.6 17.4 e = 33.6 18.8Now, how do I use this information to make better decisions on where to start as far as voltage/wire speed vs. material/conditions?Thanks!!
Reply:I don't know how to calculate the amperage since all I know is the voltage. I need to know the power (watts) to derive the amperage. I would also think that the amperage would be affected by the wire speed (arc length) and speed. Is the amperage something the manufacturer should provide?Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Originally Posted by Rob PageI don't know how to calculate the amperage since all I know is the voltage. I need to know the power (watts) to derive the amperage. I would also think that the amperage would be affected by the wire speed (arc length) and speed. Is the amperage something the manufacturer should provide?
Reply:Originally Posted by Rob PageI don't know how to calculate the amperage since all I know is the voltage. I need to know the power (watts) to derive the amperage. I would also think that the amperage would be affected by the wire speed (arc length) and speed. Is the amperage something the manufacturer should provide?
Reply:Whew, threw me for a loop!! Well, let's see what Lincoln and my inductive ammeter say ....Tested on .030 and the roll bar last night. D 5 seemed to work well. Now if I could just see the puddle!!Thanks!!!Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Please share results.DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:This is the "design" amperage at the taps from Lincoln. My voltages were very close! I would think you could only attin the high amperage with .035 wire. Attached ImagesSP170T Amperage.pdf (48.4 KB, 91 views)Rob PageMiller Bobcat 250Lincoln SP170-T
Reply:Very nice. I think its correct. Now think about actual welding voltage. You need at least 19 volts to have a decent bead. Anything under that is amps, but not usable to weld in that amp zone. If you look at the 20 volt line, it matches up with 130 amps for the highest setting. I am not knocking your machine at all. I have done tests with an SP100 and a Hobart 140. There was a long discussion about it. Do what you have to so you can see the weld.Nice jobDavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:With C-25, tap D should perform real well with an .030 or .035 on steel around an 1/8" thick.As I suspected the slope on your taps is pretty steep, which should mean that tap D more than likely produces a fairly spatter free weld , when the arc is dialed in solid. This is assuming too, that Lincoln did a fairly good job on the inductance level.BTW, as long as your unit can feed the wire fast enough, you 'll beable to get around 19V and 160 amps out of the unit with an .030 or .035 wire, using tap E.To get much more then 160 amps out of the unit, you're going to have to switch to a self shielded fluxcore like an E71T-11, which when compared to a solid wire requires a lower voltage for the same amperage.
Reply:Thanks for everyone's input. If I understand the relationship of wire speed and voltage, then to weld thicker metal I need higher voltage, thicker wire, and higher wire speed, thereby increasing the amount of delivered amps and penetration.I think for $250 with #3 bottle with 200 psi C25, Smith Ball Flow Meter, and 4 rolls of assorted wire (new in the box) this is a good machine to learn MIG with and use for my small stuff and auto body work. Btw, anything over 3/16 I will use the Bobcat 250 and stick weld it. Thanks again!! This is a GREAT forum.Rob PageMiller Bobcat 250Lincoln SP170-T |
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发表于 2021-9-1 00:56:40