Solder Liquidus Temperature
The solder liquidus temperature is the point at which the solder becomes fully liquid. It gives the minimum temperature at which melting begins.
Physical-Chemical Working Principle
The braze liquidus temperature (LLT) is the threshold temperature below which the metal stays solid and above which it becomes fully liquid. This transition happens as the crystal melts into a liquid structure.
Metallurgical Relevance & Welding Risks
The LLT is critical for choosing the right welding method and parameters. Too low a temperature and the braze won't flow, giving poor joints. Too high a temperature and the metal can overheat or react with surrounding materials.
Workshop Practice & Action Points
Determine the LLT for your braze from reference tables or lab tests. Make sure the welding temperature is always above the LLT to get a fluid joint. If you have flow problems, check both temperature and braze.