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[MW:1114] fillet welding

In my company they are using 4.8mm thickness saw wire for carbon
steels, to get a circumferential fillet size of 6-10mm for a material
thickness of 10-20mm.
Wire feed is about 40-52 ipm
Stick out 35-40mm
Drift 25mm
Voltage 32-35 V.
Travel speed 17-20 ipm.

Due to this for a fillet size of 6 mm, we get about 7-8 mm fillet size
and the penetration is about 3mm but we need the penetration is about
1.5mm only.
Tell me some suggestion…
Whether due high penetration in fillet welds any effects can occur.
What can be done to reduce the penetration with out decrease in fillet
size?
Or I can increase the stick out to decrease the penetration.
Or can I reduce the electrode diameter.
Or to reduce the wire feed rate and voltage.

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