Lastifil 5003

Easy flowing copper alloy for MIG welding

Solid welding wire for joining, refacing and repairing pure copper, copper-silicon, copper-manganese alloys and brass.

Also suitable for building up a copper layer on carbon steel, lowalloyed steel, cast iron and for joining copper to steel.

Specifications & Usage


Welding CuSi2Mn (Wn° 2.1522), CuSi3Mn (Wn° 2.1525) and brass (Cu-Zn alloys).

Also suitable for joining galvanised steel, where the low working temperature helps to prevent zinc burnoff.

Suitable for Mig brazing of thin galvanized sheet metal.

Hardness: 80 - 100 HB


Shielding gas: argon (or Helium for thicker materials or for higher welding speeds.)

Weld thin beads in order to obtain a fast cooling rate of the deposited metal.

Preheat pure copper.

Weld CuSi castings without preheat and limit the interpass temperature to max. 70 °C (160 °F).


Welding proces: Mig/Mag welding (GMAW)
Material Type: Copper (alloys)
Welding positions: All
Norm : EN ISO 24373
Classification: CuSi3Mn1
Norm: AWS A5.7
Classification: ER CuSi-A
Minimum packing: 15 kg spool (in a cardboard box)