Automotive Electronics Practice Test

What type of solder is recommended for electrical work?

1. Rosin core

2. Acid core

3. 60/40 with no flux

4. 50/50 with acid paste flux

The correct answer is: Rosin core

The recommended type of solder for electrical work is rosin core solder. This solder contains a core of rosin flux, which helps to clean the surfaces of the components being soldered, ensuring a good electrical connection. The rosin flux is non-corrosive and does not conduct electricity, making it safe for use in electronic applications. It provides the necessary cleaning action and helps prevent oxidation during the soldering process, which is crucial for creating reliable and long-lasting joints. In contrast, acid core solder is designed for plumbing and metal fabrication, where the acidity of the flux can help bond metals but is too aggressive for electronic components, potentially damaging sensitive parts. Solder without any flux, like 60/40 with no flux, does not provide the necessary cleaning action needed for proper adhesion to electrical components. Similarly, a 50/50 solder with acid paste flux is primarily suited for non-electronic applications and can lead to corrosion of the electrical connections over time due to the residual acid left behind after soldering.