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Extra-hard solder has 80% silver and melts at 740 °C (1,370 °F). If multiple joints are needed, then the jeweler will start with hard or extra-hard solder and switch to lower-temperature solders for later joints. Silver solder is somewhat absorbed by the surrounding metal, resulting in a joint that is actually stronger than the metal being ...
Silver content reduces solubility of silver coatings in the solder. Not recommended for gold. [12] Forms a eutectic phase, not recommended for operation above 120 °C. Pb 80 Sn 18 Ag 2: 252: 260 [16] Pb: No: Used for soldering iron and steel [28] Pb 54 Sn 45 Ag 1: 177: 210: Pb: exceptional strength, silver gives it a bright long-lasting finish ...
Both quantitative and qualitative tests for solderability exist. [6] The two most common testing methods are the 'dip and look' method and wetting balance analysis.In both of these tests, the soldered pieces undergo an accelerated aging process before being tested for solderability, to take into consideration the time a component was in storage prior to mounting to final assembly.
Soldering performed using alloys with a melting point above 450 °C (840 °F; 720 K) is called "hard soldering", "silver soldering", or brazing. In specific proportions, some alloys are eutectic — that is, the alloy's melting point is the lowest possible for a mixture of those components, and coincides with the freezing point.
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Tin-silver-copper (Sn-Ag-Cu, also known as SAC), is a lead-free alloy commonly used for electronic solder. It is the main choice for lead-free surface-mount technology (SMT) assembly in the industry, [ 1 ] as it is near eutectic , with adequate thermal fatigue properties, strength, and wettability. [ 2 ]
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