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depends on the material thickness and wire in use for the welding
there are plenty of books and u-tube videos to help with getting the correct wire feed settings and voltage and current settings
It all comes down to operators experience and ability to use the welder correctly
Have you checked so see if your power cable is the right size?? Is it a 220 or 110? If it is 110 then it will cut off after it gets hot, if it is 220 and the power cord is too small then the machine will be trying to pull more amps than the cord can handle causing it to overheat and shut off.. My husband has been a welder for 20 years.. I'm just passing along what he suggested might be the problem.. Hope this helps!
read you hand book on the settings but it all depends on material thickness being welded
higher volts = higher amps will require faster feed speeds = thicker materials
sheet metal thickness (.040"-1mm) will require very low volts -up to 20 v with a slower feed speed
remember the unit will have a very short duty cycle and that means that you cannot start a weld and keep it going for many minutes especially at high amps
it works like this ,if it is a 20% duty cycle ( on the plate of the machine then for every 20 seconds of power ( high amps) the machine has to rest for 80 seconds
if you are welding panel metal the ( very low amps) then you can weld for longer periods but the rest period has to be 4 times the weld period
They told me at welding school the mig transformer has a different slope (whatever that means?) to the tig and mma transformer so I am a little surprised at your question. The implication is two transformer are needed for the three types of welding and for tig and mig a dc converter and also for dc mma welding.
From your description it seems as though welding current is not arriving at the tip of the mig torch or the current is arriving in the wrong form.
You say the mma is fine but you didn't say whether it is fine on ac welding, dc welding or both. I have not tried mig welding with ac and have no idea whether it would be successful but I imagine a lot of sparks and not much welding. The problem could be the rectifier unit is either not working or is switched out of the circuit.
Polarity is important too with dc tig and mig welding.
you can weld aluminum with the lincoln but you will need to change the liner in the wand to a nylon one and swich the gas to 100% argon and of course change the wire to an aluminum roll. and practice-practice-practice it is much more difficult to weld aluminum then steel and requires much more control.
a mig welding unit of 100 amps is very low, you will require a small wire size, plus the contact tip, liner to suit, expect to get a maximum amperage of 70- 80 amps max, if the unit is Aluminium wound transformer then expect 6 months use, and the ampage will drop ,then its scrap, depending on the weather conditions that the unit is kept, will depend on the live of the unit.
15 PSI is the absolute MINIMUM flow rate you should use on ANY project.
35 should be the max required without physical shielding. If he is good at what he does, he may feel the need to stick with what he knows for good shielding/penetration/ and quality. You are the boss, and he should be supbordinate to your requests. If all else fails, comprimise on 25, and lock-tite the adjustment knob!
Also, your welding supplier may have a handy dandy reference chart for regulator settings based on material and wire you are using. http://www.millerwelds.com/resources/improving-your-skills/mig/
Research a little here for guides and reference materials.
MIG stands for Metal Inert Gas welding, many times called Wire-feed.. Also referred as GMAW (Gas Metal Arc Welding). The "Metal" refers to the wire which is what is used to start the arc. It is shielded by inert gas and the feeding wire also acts as the filler rod. A semi-automatic process, it is fairly easy to learn and use.