Solder joint is the process of joining of metals wherein joint is produced by heating to a suitable temperature and used of filler metals having a liquidus temperature not exceeding 4270C and bellow the solidus temperature of base metals. In the solder joint the filler metals are spreads throughout in the properly fitted joint surfaces by the capillary attraction force.
Principle of soldering joints or how to solder:
The following issue should be maintained for the good solder joint.
Sn % Pb % Solidus Temperature 0C Liquidus Temperature 0C
70 30 183 193
63 37 183 183
50 50 183 215
33 67 183 260
25 75 183 266
5 95 300 315
When heated the base metals and the flux is promoting or accelerating the wetting of metals with solders. The purpose of soldering flux is to removing the oxides and other impurity particles from the soldering surfaces and prevents the re-
How to selection of solder joint flux:
The solder joint flux depends on —
Solder joint method:
There soldering methods are classified in the types of heating applications. The various solder joint methods are—
1. Soldering Iron 2. Dip and wave 3. Resistance 4. Furnace ad hot plate 4. Spray
5. Ultrasonic 6. Ultrasonic 7. Condensation 8. Induction 9. Torch method.