set up problems

Tue, 31 Aug 2021 15:16:36 GMT

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I'm having a hard time adjusting a lincoln suitcase connected to a large old miller constant current welder.I' ve been welding for 30 plus years stick and mig using constant voltage miller delta weld and miller feeders.setting amps and speed is the problem and maybe technique.using trimark .045 777fux core.new job and some of the guys that have experience with this setup seem to not have problems but if I use thir setup feed speed and amps seem too high.thanks for any replies in advance.
Reply:My understanding is that you need a constant voltage source for MIG. I don't have the knowledge to know if you could pull it off with the wrong kind of source. I DO have the knowledge to tell you they are very different things (constant voltage vs constant current).
Replyo you have the switch inside the feeder set to cc?  If you do, the wire feed speed is different from the knob. Look inside, there is a chart of actual WFS or ipm .   Does this help?Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Hello deezel, as David R mentioned, definitely check on the inside of the LN to be sure that your current selector switch is set to CC, the toggle switch on the front of the LN should be set to +, referring to polarity and then be sure that your machine polarity is set for reverse polarity. The type of wire that you listed is designed for reverse polarity(suitcase connected to the + terminal of your machine) unlike the self-shielded wires that you have probably run in the past that are designed to run on straight polarity(suitcase connected to the - terminal on your machine). You may need to play with the voltages and wirespeeds a bit to get it dialed in, however, as long as you stay a bit on the higher side of the voltage(23 to 28volts) you should be able to get this wire to run somewhat similar to the shop type set-ups that you have run in the past. You may notice an affinity to not varying your stick-out distance much, keeping it as constant as possible will prevent hiccups in the progression of the beads. Good luck and best regards, Allanaevald

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