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Soldering & The Tinning Process
Electronics 1CVHS
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What is Soldering?
Solid electrical connection
Mechanically connects metal to metal
Electronic solderingsoft soldering
350° F
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Wave Soldering Machine
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Wave- Intake
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Successful Soldering
1. Correct solder and flux
2. Required equipment
3. Clean soldering pencil tip
4. Safety
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Solder
Metal alloy of tin and lead
Symbol for tin - Sn
Symbol for lead - Pb
63% tin and 37% lead
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Solder – 63Sn/37Pb
No mushy range
Eutectic alloy
Lowest melting solder alloy
350°F - 600°F
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Solder - 60/40
Use 60/40 in electronics because less expensive
Standard Wire Gauge - SWG
SWG .031
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Flux
Helps solder flow
Removes oxidation
Protects copper while solder melts
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Flux
Rosin-based is used for electronics
Acid-based is corrosiveDO NOT USE IN ELECTRONICS
Used in stain glass lampshades
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Flux
Available as a paste
Available as a liquid
Solder has a rosin flux core
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Equipment
Soldering gun Instant heat - high watts
Too hot
Copper tracks and pads come off board
Damage components
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Equipment
Soldering iron (pencil)
Slower warm-up
Lower wattage - 25 watts
Tight spots
Various tips - conical best
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Clean Tip
Tip becomes oxidized with heat
Wipe off oxidation with damp sponge
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Clean Tip
File away heavy oxidation
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Clean Tip
Tin pencil tip
Prevents oxidation
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What is tinning?
“Tinning” means covering the tracks & pads on your PCB with solderPCB tracks & pads are made of copperWhen exposed to air & oils on your skin, copper oxidizesPCB must be tinned in order to prevent corrosion & ensure a good electrical connection
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Steps for tinning your PCB
1.Clean all tracks
2.Apply flux to all tracks
3.Heat tracks & add solder
4.Spread & add solder over all tracks
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SafetySolder over workbench
Treat pencil as always hot
Safety glasses must be worn
Solder Contains Lead – Washing hands is recommended
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Safety
Put pencil in stand
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Review
1. The best ratio of solder to use in electronics is:
2. This is because:3. We use _______-based flux4. What is the difference between a soldering
gun & pencil?5. Why do we tin our PCB’s6. What safety considerations are important to
remember when soldering?
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Demonstration