• Brazing and Welding Fillers

Brazing and Welding Fillers

Descriptions, composition in mass percent, application examples and properties of welding fillers and hard solders.

DIN EN 1044   Hard soldering - filler materials
DIN 8513   Hard solders - solders on the basis of copper
EN 13347   Copper and copper alloys:
Rods and wires for welding fillers and hard solders
DIN 1733   Filler materials for copper and copper alloys
EN ISO 3677   Fillers for soft soldering, hard soldering and braze welding - descriptions


Brazing is different from welding in that it uses filler (solder) that has a lower melting point than the basic materials; therefore the basic materials are not melted. As a result, basic materials and solder may have different compositions.

The characteristic properties of the solders are their melting ranges as well as their operating temperatures. Above liquidus temperature there is only melted mass, below solidus there is no liquid mass. Operating temperature is the lowest surface temperature at the soldering point where the solder is wetted or forms a fusible phase by means of interfacial diffusion.
The operating temperature may be in the melting range of the solder. Liquidity temperatures of hard solders are above 450°C. For fusion brazing, the surfaces to be joined are at a constant distance of ) 0.23 mm. For braze welding, the distance of the surfaces to be joined is 0.50 mm.

Large-surface or local melting of basic material and weld material. Joint-welding (fusion welding), most of the time with similar weld materials with identical or almost identical melting range.
Build-up welding (weld-cladding) e.g. for corrosionresistant surfaces with similar or different weld materials. In literature, fillet brazing of e.g. CuSi3Mn1 on ferritic-pearlitic steels in automobile construction are often erroneously referred to as build-up welding.

Common procedures for copper-based alloys are: MIG (metal inert gas), TIG (tungsten inert gas) and less commonly manual arc welding. Rarely, gas welding (acetylene welding) is used.



Description DIN prEN13347 DIN 8513 DIN 1733 EN 1044 EN ISO 3677
SML59F CuZn40Sn1MnNiSi CF731R L-CuZn39Sn CU306 Cu59Zn(Sn)(Ni)(Mn)(Si)-870/890
SML61F CuZn40SiSn L-CuZn40 SG-CuZn40Si CU302 B-Cu60Zn(Sn)(Si)-875/895
SML60 CuZn40MnSi CF762R L-CuZn40 CU303 B-Cu60Zn(Sn)(Mn)-870/900
SML61 CuZn39Mn1SiSn CF728R
SML62 CuZn37Si CF729R
SML573 CuZn40Ni2Sn1SiFe
SMLS58 CuZn41SnNiSiFe
NML48 CuNi10Zn42 CF411J L-CuNi10Zn42 CU305 B-Cu48ZnNi(Si)-890/920
NMLAG LNs46Ag CuNi10Zn42Ag1Si
• not standardized
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