miller 251with 75/25
by Dean
(Or)
What formula do i use to set the voltage and also the wire feed speed, i am learning the machine but i don't know how to adjust when i have to weld vertical, can u help? I am mostly welding. 3/8", 1/2", some 5/8", track hoe bucket rebuilds and miscellaneous.
--------------------------------------------------
One method to find good mig welding settings using a millermatic 251 is to use the chart on the inside of the panel door.
In my opinion, these settings are across the board about 10 % higher on wire speed than what I prefer....but its a good starting point.
for vertical welds, I find that choosing about 2 thicknesses less than what I am welding gives a pretty good setting ( minus the 10% )
The miller weld calculator seems to be about the same as the charts they use for the millermatic welders..
http://www.millerwelds.com/resources/calculators/mig_solid_amperage_calculator.php
is a good resource. but it is intended to be used for single pass horizontal fillet welds and the settings are pretty hot for anything but flat , horizontal, or downhill.
so what you can do for vertical uphill settings is select the thickness for about half of what you are welding and then use the weld calculator
for example, half of 3/8" is 3/16" so the settings for 3/16" using 75/25 with .035" bare wire are 18-19 volts and 320-340 ipm...that should work pretty well for vertical uphill on 3/8"...give or take. you may need 19-20 volts but its a good start.
once you get a good match of voltage and wire speed,, if its too hot or cold , just increase or decrease both voltage and wire to suit the heat you need.
Would you like to get free welding videos in your inbox every week?
Tig FingersThe Real and Original TIG Finger® and XL model
Stubby Gas Lens and Pro TIG kits
2% Lanthanated, CK LaYZr, Purple, more
Our Weldmonger Stubby Gas Lens kit is the Best
