These alloys are predominately used for the joining of copper tubes but can also be used for the joining of copper to brass by using a suitable flux. Copper phosphorous alloys must not be used for the joining of nickel and nickel based alloys or copper alloys containing nickel. The brazed joints can become inherently brittle due to the formation of intermetallic compounds.
The reduction of phosphorus and the addition of silver have a profound effect upon the fluidity of brazing alloys. The alloys of higher phosphorus content are extremely fluid, while the lower phosphorous, high silver alloys have a broad plastic range. Even small adjustments in alloy percentages have a marked effect on brazing alloy fluidity. Copper phosphorous alloys are widely used in the refrigeration and air conditioning industries. As these alloys are self fluxing there is no need for additional flux to be used when brazing copper to copper.
| PRODUCT |
COMPOSITION % |
MELTING RANGE 0C |
TENSILE STRENGTH |
EUROPEAN STANDARDS |
|||
| Ag |
Cu |
P |
0C |
Kg/mm2 |
DIN EN 1044 |
BS-1845 |
|
| SILWELD |
0 |
92.6 |
7.4 |
714 - 810 |
58 |
CP-202 |
CP-3 |
| SILWELD A |
0 |
93.8 |
6.2 |
714 - 890 |
58 |
CP-203 |
CP-6 |
| SILWELD 2 |
2.0 |
91.5 |
6.5 |
650 - 810 |
55 |
CP-105 |
CP-2 |
| SILWELD 5 |
5.0 |
89.0 |
6.0 |
650 - 810 |
54 |
CP-104 |
CP-4 |
| SILWELD 6 |
6.0 |
87.0 |
7.0 |
645 - 720 |
54 |
||
| SILWELD 15 |
15.0 |
80.0 |
5.0 |
645 - 800 |
54 |
CP-102 |
CP-1 |
| PRODUCT | DESCRIPTION |
| SILWELD | Silweld is a low-cost alloy for many copper-to-copper applications where good fit-up can be maintained and brazing temperature is not critical. Silweld is lower in ductility compared to the alloys containing silver. |
| SILWELD A | Similar to above but slightly more sluggish and slightly more ductile. |
| SILWELD 2 | Silweld 2 has a lower melting range than Silweld. It is an ideal alloy for the filling of gaps in poorly fitted joints and will produce an excellent fillet joint. Silweld 2 is the most common alloy used for the joining of copper tube in the air con and refrigeration industry. |
| SILWELD 5 | Silweld 5 characteristics are such that on the lower end of its brazing temperature range it has sluggish flow characteristics, which enable to fill gaps in poorly, fitted joints. On the other hand when brazing at the high end of its brazing range it is very fluid making it also ideal for tight fitting joints requiring deep penetration. |
| SILWELD 6 | Silweld 6, like Silweld 5 is widely used in the air conditioning and refrigeration industries because of its moderate flow with good fillet forming characteristics when the joint fit up dimensions are less than perfect. |
| SILWELD 15 | Silweld 15 has superior ductility compared to the lower silver content copper-phosphorous alloys. Of the copper-phosphorous alloys Silweld 15 has the most sluggish flow characteristics making it ideal for gap filling and fillet forming. |
Alloys available in 1.5, 2.5, 3.0, 4.0 and 5.0-mm diameters (4.0 & 5.0 special order)
Available in rod, strip, paste and rings
Home I Products I Online Shop I About Us I Contact Us
Website design By DV8 Media (UK) LTD