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Here is some information I found from one of the FCAW Electrode Manufacturers that can get you started with pretty good operating parameters. This information duplicates the parameters for ESAB Wires. ESAB has a great deal of information about their filler metals on their product site

Suggested Welding Parameters for FCAW E71T-1

Flat				Vertical-Up			Overhead
Diameter	Volts	Amps	Optimum	Volts	Amps	Optimum	Volts	Amps	Optimum
.035"(0.9 mm)	20-30	130-280	26V, 200A	16-23	90-80	23V, 150A	20-28	130-240	26V, 200A
.045"(1.2 mm)	23-30	150-290	27V, 240A	22-26	150-250	25V, 200A	24-29	150-250	27V, 210A
.052"(1.4 mm)	24-32	180-310	28V, 260A	21-26	150-230	25V, 210A	24-30	160-280	28V, 220A
1/16"(1.6 mm)	25-34	180-400	28V, 275A	21-27	180-300	25V, 220A	24-30	180-310	28V, 240A

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