Fronius MTG 270i US-Style Manual De Instrucciones página 42

Poor-quality weld properties
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42
Incorrect welding parameters
Correct settings
Poor ground earth connection
Establish good contact with workpiece
Too little or no shielding gas
Check pressure regulator, gas hose, gas solenoid valve, and welding torch
gas connection. For gas-cooled welding torches, check gas seal, use suita-
ble inner liner
Excessively large or heavily worn contact tip
Change contact tip
Incorrect wire alloy or incorrect wire diameter
Check the inserted wire spool/basket-type spool
Incorrect wire alloy or incorrect wire diameter
Check the weldability of the parent material
Shielding gas not suitable for wire alloy
Use correct shielding gas
Unfavorable welding conditions: Shielding gas contaminated (moisture, air),
inadequate gas shield (weld pool "boiling", draft), impurities in the workpiece
(rust, paint, grease)
Optimize welding conditions
Welding spatter in the gas nozzle
Remove welding spatter
Turbulence due to excessively high quantity of shielding gas
Reduce quantity of shielding gas; recommended:
shielding gas quantity (l/min) = wirespool diameter (mm) x 10
(for example 16 l/min for 1.6 mm wire electrode)
Excessively large distance between welding torch and workpiece
Reduce distance between welding torch and workpiece (approx. 10–15 mm/
0.39–0.59 in.)
Excessively large work angle of the welding torch
Reduce work angle of the welding torch
Wirefeed components do not correspond to the diameter of the wire elec-
trode/the material of the wire electrode
Use correct wirefeed components