Soldering with lead-free materials does not need to be difficult. There are a number of tools that are designed specifically to make this job easier. When they are combined with the right techniques, a novice can enjoy an end product that is clean and residue free.
For the best results, use the appropriate alloy combination that is designed to be drawn into the wire. One such alloy is made of a tin-silver-copper combination (SAC) such as Chip Quik SMD291SNL10 Rework Solder Lead Free. This solder has a melting temperature of 217 degrees and is designed to be no clean. When compared to the other popular alloy formulation that utilize tin-copper (SnCu), this type of solder offers a quicker melting point, ensuring that it wets better and has better flow.
To promote the proper wetting necessary to solder components together, the wire you choose needs to have at least 2% flux by weight. Using wire that has this weight allows for a good balance between wetting times and the possibility of residue. For wetting times that are deemed too slow, 3% flux can be used. However, the residue that is typically the result can be unsightly. Kester flux is specifically designed to work within lead free applications. Charring, splattering and the breakdown of the flux are minimized even when the necessary higher temperatures are used.
The right tip choice makes all the difference in the delivery of the Kester solder. Lead free tips are crucial to both the success and aesthetics of the bond. These tips need to be able to deliver enough heat so that the right amount of coverage is generated. To increase the life of tips, it is important that the entire tip be designed for lead free applications. Those tips that are simply tinned with solder that is lead free tend to have a dramatically shortened life span.
Choose the Right Technique
Before making the final selection of flux, ensure sure that parts can be easily soldered with it. This will help reduce the desire to add excessive amounts of flux as well as the need to rework the piece repeatedly. Keeping contact times to a minimum will also result in a cleaner end product.
Lead free soldering can result in a stable connect of materials that is also clean and residue free.