Fronius MTG 250d Manual De Instrucciones página 60

Poor weld properties
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60
Incorrect welding parameters
Correct settings
Poor grounding (earthing) connection
Ensure good contact to workpiece
Too little or no shielding gas
Check the pressure regulator, gas hose, gas solenoid valve and wel-
ding torch shielding gas connection. On gas-cooled welding torches,
inspect the gas seals, use a suitable inner liner
Welding torch is leaking
Replace welding torch
Contact tip is too large or worn out
Replace contact tip
Wrong wire alloy or wrong wire diameter
Check wirespool/basket-type spool in use
Wrong wire alloy or wrong wire diameter
Check weldability of the base material
The shielding gas is not suitable for this wire alloy
Use the correct shielding gas
Unfavourable welding conditions: shielding gas is contaminated (by
moisture, air), inadequate gas shield (weld pool "boiling", draughts),
contaminants in the workpiece (rust, paint, grease)
Optimise the welding conditions
Shielding gas escaping at clamping nipple
Use the correct clamping nipple
Clamping nipple seal ring defective, shielding gas escaping at clam-
ping nipple
Replace clamping nipple to ensure a gas-tight seal
Welding spatter in the gas nozzle
Remove welding spatter
Turbulence caused by too high a rate of shielding gas flow
Reduce shielding gas flow rate, recommended:
shielding gas flow rate (l/min) = wire diameter (mm) x 10
(e.g. 16 l/min for 1.6 mm wire electrode)
Distance between the welding torch and the workpiece too great
Reduce the distance between the welding torch and the workpiece
(approx. 10 - 15 mm / 0.39 - 0.59 in.)
Tilt angle of the welding torch is too great
Reduce the tilt angle of the welding torch