Umicore BrazeTec 4900 优美科银焊片焊丝焊条
Standard ISO 17672
Ag 449 (DIN EN 1044) (AG 502) (AWS 5.8) (BAg-22)
Nominal composition [wt.-%]: Ag 49; Cu 16; Zn 23; Mn 7.5; Ni 4.5
Permitted impurities max. [wt.-%]: Al 0.001; Bi 0.030; Cd 0.010; P 0.008; Pb 0.025; Si 0.05
Max. impurities [wt.-%]: 0.3
Technical data
Melting range: approx. 680 - 705 °C
Working temperature: approx. 690 °C
Density: approx. 8.9 g/cm³
Shear strength acc. DIN EN 12797
250 - 300 MPa (carbide/steel)
Electrical Conductivity: approx. 4.0 m/ mm²
Operating temp. of brazed joint: approx. -200 °C to +200 °C (without loss in strength)
Standard delivery forms*
Wire: 1.0 - 1.5 - 2.0 mm Ø
Rods: 1.0 - 1.5 - 2.0 mm Ø, 500 mm length
Ribbon: 0.1/ 0.2/ 0.3/ 0.4 mm thickness and 70 mm width
Preforms: rings, shaped parts, sections, stamped and shaped parts, shims, discs, perforated plates
*Other delivery forms upon request
Applications
BrazeTec 4900 is a low melting silver based brazing alloy with excellent flow characteristics. The brazing alloy is suitable for brazing of cemented carbides and materials which are difficult to wet, such as tungsten, molybdenum, tantalum and chromium. The reachable strength of the joint depends from the parent metals.
It can be used for brazing with flame or induction brazing procedures.
Typical applications are found e.g. in the tool industry.
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