pits or slag in my root test plate

by chuck
(cape coral fl)

i have been practicing to take 3g test when i take my backing off and grind it down i see pits in my root pass.i cant tell if its slag orunder cut? i am using flux core wire 045 with gas i am running wire speed270 and volts at 22.5 any suggestion would be appreciated.


thanks chuck


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flux core can be very sensitive to both voltage and stickout.

try lowering the voltage by only one half a volt to avoid those worm tracks.

also stickout matters too.

for bare wire mig, a short stickout important.

but for flux core , a longer stickout usually works better.

if you can, go to the manufactures web site and look up the data sheet for the particular wire.

there is usually a wealth of information on voltage, wire speed, techniques etc.