Solder Alloy Melting Range
Solder alloy melting range is the interval between solidus and liquidus temperatures in which the solder is pasty. A wide range helps fill gaps without flowing away.
Physical-Chemical Working Principle
The melting range of the braze alloy defines the temperature range in which the metal transitions from solid to liquid and back to solid. Solidus is the point below which the metal is fully solid; liquidus is the point where it is completely molten.
Metallurgical Relevance & Welding Risks
A wide melting range (large difference between solidus and liquidus) allows better gap filling without running. A too-narrow range can cause liquidion, which weakens the weld. Also, a too-wide range can lead to uneven cooling and possible cracking.
Workshop Practice & Action Points
To get the most out of the braze alloy melting range, watch these points:
• Temperature control: Keep the weld near the solidus point to maintain a pasty state.
• Gap filling: Use metals with a wide melting range for better gap filling without running.
• Cooling: Make sure cooling is controlled and even to avoid cracks.