Special usage
Low Ag solder · no Ag solder
Requirement for low Ag of solder alloy, role of Ag
The most widely used lead-free solder is Sn-3.0Ag-0.5Cu, which contains 3% Ag.
Ag, which is a precious metal, is expensive and price fluctuations are intense, so we have high risk of material cost and cost fluctuation in packaging.
Low Ag solder (reduced Ag content), and no Ag solder (not using Ag) are being introduced for this reason.
Ag in the solder has the role of lowering the melting point of the alloy, improving the wettability, increasing the mechanical strength, fatigue strength, creep strength, and so on. For this reason, there are packages that can be used with low-Ag solder and packages that are not applicable, and we need to proceed with the introduction taking this into account.
Introducing examples of low Ag and non-Ag solder
The packaging that can be introduced with low Ag and no Ag has the following features.
■Parts with large dimensions and large solder amount
TV · home appliances, LED lighting, battery pack
■Stress-free parts are soldered after mounting
Coil part of the motor (no stress occurs as the coil bends)
Complement of wettability and workability by flux
Since low Ag and no Ag solder contain a small amount of Ag, wettability and workability of them are inferior to ones of Sn-3.0Ag-0.5Cu solder. However, complementing with sufficient wettability flux ensures performance close to that of Sn-3.0Ag-0.5Cu.
We have solder paste and flux cored solder wire, corresponding to low Ag, no Ag, so please contact us.
