On the Bestarc Mig 145. You can turn off the synergic mode, by pushing the knob in (clicks). Then it will use volts and wire speed (-30 to 30). Whatever units those are in.

For the question, I'd think I'd set the amps a smidge higher, since with co2 runs a little hotter for same amps as 75/25 mix.

Not a bad little machine, but really hate the shortness of the mig cable. Like 4.5 ft of cable not counting the gun. Just aggravating in use, even when welding on something small. Keep having to reposition. The other thing, is the 1 or 2 lb spools run out too quick and cost way more per lb than the 10lb or larger spools. (I'm almost tempted to wind my own 2lb spools from a 33 or 44 lb spool).

 

Not a bad little machine, but really hate the shortness of the mig cable. Like 4.5 ft of cable not counting the gun. Just aggravating in use, even when welding on something small. Keep having to reposition. The other thing, is the 1 or 2 lb spools run out too quick and cost way more per lb than the 10lb or larger spools. (I'm almost tempted to wind my own 2lb spools from a 33 or 44 lb spool).

I have had those same thoughts,, but, this machine is mostly for my 10 year old grandson,,
If he goes through a dozen spools of wire,, it will be a shock.
I may be too old to acclimate to MIG welding,, ,, time will tell,,

 

I genuinely dislike synergic machines....

I try them, get irritated, turn feature off and weld happy.

 

From the manual:

Go into your “settings” mode.

Tap on the Happy Face Icon.

Press and hold the SET button for two seconds.

 

I like synergic machines as long as you can trim either the arc length (voltage) or wirespeed independently. In this case it doesn't sound like that's possible unless you put it in manual mode.

 

The machine wants you to select an "amperage" that corresponds to the material thickness.
But, the only choice is for CO2 gas,, right now, I can only use 75-25,, so i was trying to figure out if I should raise the amps, or lower,,

As you raise the amps, the volts also goes up.

 

I set the Bestarc MIG for 100 amps,, told my grandson what to do,,
and he was off welding!!
I did not even demonstrate,, I had him do a few spot welds,,
then I told him to just keep the trigger pressed, and move along the seam of the parts,,

He was MORE than amazed that he welded the parts together,,

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