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Cause: Only on water-cooled machines: water flow is insufficient
Remedy: Check water level, water flow rate and cleanliness, routing of hosepack, etc.
Contact tubes only give a short service life
Cause: Incorrect wirefeed rollers
Remedy: Use correct wirefeed rollers
Cause: Wire electrode worn due to excessive contact pressure at the wirefeed rollers
Remedy: Reduce contact pressure at the wirefeed rollers
Cause: Wire electrode contains impurities/corroded
Remedy: Use high-quality wire electrode with no impurities
Cause: Uncoated wire electrode
Remedy: Use wire electrode with suitable coating
Cause: Wrong dimension of contact tube
Remedy: Use a contact tube of the correct dimensions
Cause: Duty cycle of welding torch has been exceeded
Remedy: Shorten the duty cycle or use a higher capacity torch
Cause: Contact tube has overheated. No thermal dissipation as the contact tube is too loose
Remedy: Tighten the contact tube
NOTE! When using CrNi, the contact tube may be subject to a higher degree of wear due to the
nature of the surface of CrNi welding wire.
Lock washer is not clamping the gas nozzle
Cause: Dirty lock washer, twisted lock washer
Remedy: Clean off any dirt, turn the lock washer to tighten, push the gas nozzle down at the front while
tightening
Weld-seam porosity
Cause: Spatter build-up in the gas nozzle causing inadequate gas-shielding of the weld seam
Remedy: Remove welding spatter
Cause: Either the protective gas shield hose has holes in it, or the hose is not connected properly
Remedy: Replace protective gas shield hose
Cause: The O-ring seals on the connection points have been cut through or are faulty
Remedy: Replace the O-ring seals
Cause: Moisture/condensation in the protective gas shield line
Remedy: Dry protective gas shield line
Cause: Protective gas shield flow is either too high or too low
Remedy: Correct the protective gas shield flow
Cause: Insufficient protective gas shield flow rate when welding starts or finishes
Remedy: Increase gas pre-flow and gas post-flow
Cause: Rusty or poor quality wire electrode
Remedy: Use high-quality wire electrode with no impurities
Cause: For gas-cooled welding torches: protective gas is escaping through a non-insulated inner liner
Remedy: Use only insulated inner liners with gas-cooled welding torches
Cause: Too much parting agent applied
Remedy: Remove excess parting agent/apply less parting agent
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