Welding wires and rods are sensitive to moisture and surface contamination. Condensation on the wire surface leads to oxidation and, particularly with aluminium, to hydrogen porosity in the weld metal. Correct storage therefore has a direct effect on weld quality.

Storage conditions

  • Store filler metals in a dry, heated room, ideally at 15–25 °C and a relative humidity below 50 %.
  • Avoid large temperature fluctuations. The wire surface must always remain well above the dew point of the ambient air (see our dew point calculator).
  • Avoid storage above 25 °C, as the drawing lubricant on the wire surface may volatilise and impair wire feeding.
  • Store on pallets or shelves, never directly on the floor or against exterior walls.
  • Keep away from doors, gates, outdoor areas and sources of moisture, as well as from acids, solvents and other chemicals. Keep copper alloys away from ammonia.
  • Leave the material in its original, closed packaging until use.

Acclimatisation before use

If filler metals have been transported or stored in a cold environment, leave them in their closed packaging in the workshop until they have reached room temperature. Allow at least 24 hours, and longer for drums. Opening cold packaging in a warm room causes immediate condensation on the wire (see Condensation).

Stock rotation

Always use the product with the oldest manufacturing date first (FIFO).

Opened and partly used packaging

  • Return partly used spools and rods to their original packaging or a sealed PE bag before storing them.
  • Keep drums closed with a drum hood during production breaks.
  • Do not leave spools on the wire feeder in unheated halls overnight or over weekends.
  • Handle filler metals with clean, dry gloves, especially aluminium.

Damaged or wet packaging

Filler metals from visibly damaged or wet packaging may only be used after approval by a qualified person (manufacturer or welding supervisor). Wet welding wires and rods cannot be restored by drying.

Storage duration

A general maximum storage time cannot be specified. If properly stored, filler metals remain usable for a long time. In case of doubt, suitability must be confirmed by welding tests. Our team will be happy to advise you.