If you file a bit and drop the filings through a flame and you see white flashes then it is a high mag content alloy such as 5083 2.4MM 5356 is what I usually use for most jobs, then again I mainly weld marine stuff so...... I wouldn't bother trying to adjust the current via the buttons whilst welding as it is not that easy, I only used them as a remote adjust so I didn;'t have to keep walking/climbing/hobbling back to the welder. With the Parweld I used it in 4T mode, you press/hold the button until the arc ignites then you release the trigger, when you want to stop welding hold the trigger and it will slope down, release and it will extinguish. If you are doing a longish weld or a weld on a small part and the heat starts to get too much to keep up with then you can tap the torch trigger and it will drop to a lower current, you can keep welding at that lower current until it gets too cold and you can then tap again to go back to full current. Yes they should work fine or at least the IFL site says they will, I have never tried them myself.