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Silver provides mechanical strength, but with lower ductility than lead. It can improve resistance to fatigue from thermal cycles in lead-free solders. The wide variety of solder blends can help you find the right combination of properties for your electronic device. Often it is the specific combination of elements in a solder blend that can be used to get a certain result. In70Pb30 is compatible with gold contacts low gold leaching and has high resistance against fatigue under thermal cycling.
SAC Sn-Ag-Cu is a lead-free solder popular in Japan for reflow soldering and wave soldering, a bulk soldering process where the circuit board is passed over a pan of molten solder. Waves wash over the board, soldering the components. In summary, there are three main types of solder: lead-based, lead-free, and flux. Lead-based solders are the best understood, are reliable, and preferred in mission critical applications such as aerospace or medical electronics.
Lead-free solders are available for electronics that need to meet health and environmental requirements. And flux solders contain a rosin reducing agent at the core that is released during soldering removing oxidation from the bonding site. For most hobbyist applications your standard Sn60Pb40 solder is fine. Picking the right blend is about identifying the requirements you need to meet, finding the right properties to meet those requirements, and optimizing for cost.
Pick the best solder for your needs. Cadence PCB solutions is a complete front to back design tool to enable fast and efficient product creation. Cadence enables users accurately shorten design cycles to hand off to manufacturing through modern, IPC industry standard.
Capillary action causes the liquid metal to be pulled into the microscopic pores of the solid metal. These joints are only semi-permanent as the joint filler can be melted again. Welding is the fusion of two or more metals by melting the base metals together at the joint with molten metal from an electrode.
The metals must have similar melting points. Otherwise, a metal with a much lower melting point will be a mess when the other metal is ready. This joint is considered permanent: for the two pieces to be separated, they will have to be cut. The strength of a welded joint relies not only on the power of the base metal itself but also the weld being used and the amount of metal from the electrode that penetrates the joint.
Ideally, the weld will be as strong as the materials being joined, but it cannot be any stronger. Some advantages that brazing has over welding are:. Silver, like gold and platinum, is considered a precious metal; it is not cheap to use. So why would it be used for applications like connecting pipes and other metals?
Adding silver to an alloy changes its properties in ways that make it worthwhile for the consumer to spend the money. Here are some reasons to use silver solder. Due to the different melting points, one can layer the metal in the joint without remelting previous work.
Adding silver in place of phosphorous allows more control over the melting point. In addition to lowering the melting point of an alloy, silver also has a tendency to increase the melting range. When a pure metal melts, it goes from solid to liquid as soon as it reaches its melting point.
Alloys melt slowly, having a point where they are totally solid and a point where they are totally liquid. I'm not really concerned about silver being harder to work with since I'm having someone do the work for me. I guess you are talking about a musical instrument? Silver solder usually refers to a stronger solder used for mechanical joins compared to lead solder which is soft and relatively weak. However, silver solder has a higher melting temperature, which means the parts have to be heated to a higher temperature to make it work.
When I have seen silver solder used on brass it generally required the parts to be heated almost to a dull red color, which caused tarnishing and oxide formation and required significant cleaning and polishing afterwards.
This is an area where you need to make sure you are consulting experts in musical instrument repairs who know exactly what they are doing. This forum is not that place, IMHO. I'm a ChemE--I know all about the flow of fluids.
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