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Silver Solders
All silver solders meet the relevant international standards. Certificates of Conformity are readily available. The materials are available as wire, rods 1.0mm - 5.00mm dia, strip, foil, powder and paste.
Silver soldering is a brazing process.
The components must have a degree of overlap as it relies on molten alloy flowing into a joint gap by capillary action. Only in this manner will the full benefits of the process be attained.
 | The presence of cadmium in a silver solder reduces the melting range and improves its fluidity. However all such alloys should be treated as being potentially hazardous as metal fume is produced on melting.
The alloys should not be overheated. Remove the heat as the alloy melts. Excess heat will not produce better joints. Ensure that the joints are covered with a generous coating of flux.
Brazing should be carried out in well ventilated areas or with a local extraction system.
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 | The use of cadmium free silver solder has increased and is the preferred form in many industries. Removing the cadmium increases the brazing temperature and reduces fluidity.
These two effects can only be countered by the addition of more silver and tin and occasionally silicon.
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All materials will produce high quality joints with a joint strength that is likely to exceed that of the parent materials. The alloy selected will depend on other criteria such as brazing temperature, heating technique, service conditions and joint design. Free technical advice is available to produce the most cost effective joints.
Lowering the silver content of the alloy leads to; higher brazing temperature (higher service temperature) wider melting range (better gap filling properties) larger fillets and lower alloy cost per kg.
Care should be taken when brazing some types of stainless steel. If the joint is in contact with water joint failure through crevice corrosion could occur. This will not occur if the steel is an austenitic grade ie it contains nickel. A simple check is to use a magnet. They are non-magnetic.
The flux used must be compatible with both the melting range of the alloy and the parent materials. HT5 flux is recommended.
Quality Assurance
All alloys are manufactured from virgin metals to ensure they there is no contamination. They are analysed prior to extrusion and drawing. Rods are melted in "flow tests" to ensure uniform brazing characteristics.
COSSH details for both ranges of alloys are available by clicking on the appropriate heading above For more information contact us at sales@cupalloys.co.uk
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