1. Vocabulary
Tinning
Wetting
Surface tension
Flow

2. Soldering
Soldering is the process of making an electrical connection by melting low-temperature metal alloys around joints or component leads

3. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering
This presentation will…
Review the tools needed to solder wires and electronic components.
Demonstrate how to tin a soldering iron tip.
Demonstrate the soldering process.
Show the characteristics of a good solder connection.
Review classic soldering mistakes.
Introductory Slide / Overview of Presentation
Project Lead The Way, Inc.
Copyright 2009

4. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Tools
Vise
Safety glasses
Solder sucker
Solder tool
Diagonal cutters
Needle nose pliers
Solder
Solder wick
Damp sponge
Soldering iron 1 3 4 5 2 6
These tools are required to properly solder a printed circuit board (PCB). 9 7 10 8
Project Lead The Way, Inc.
Copyright 2009

5. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Iron
Typically watts
Tip Temperature 750°F (400 °C)
Stress the importance of safety to students, as degrees will burn the skin INSTANTLY.
Project Lead The Way, Inc.
Copyright 2008

6. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Solder
Solder is an alloy of tin and lead.
The solder used for electronics is frequently called 60/40 solder because it is made of 63% tin and 37% lead.
60/40 solder melts at 361 F.
Project Lead The Way, Inc.
Copyright 2009

7. Soldering Iron Care & Maintenance
Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Iron Care & Maintenance
Un-Tinned
A soldering iron must be coated with a thin coat of solder. This will allow for the transfer of heat to the work piece.
This procedure is called tinning.
The tip must be kept coated with a shiny layer of solder by occasional wiping and applying solder directly to the tip.
Tinned
Properly tinning a soldering iron is essential for making good solder joints.
Project Lead The Way, Inc.
Copyright 2009

8. Student Hands On Training Workshop (SHOT 2007)
Tinning Process
Tin the tip of the soldering iron by melting an inch or so of solder on the tip.
The iron will now look shiny on the tip.
Then wipe any excess solder on the golden sponge.
Now place the iron back into the holder. Tinning your soldering iron in this manner will aid in future soldering.
June , 2007

9. Student Hands On Training Workshop (SHOT 2007)
Tinning Process
June , 2007

10. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Safety
Wear safety glasses when soldering. This includes all individuals in the vicinity of someone who is soldering.
Place soldering iron in an approved holder when not in use. The iron is hot and can cause burns.
Place the soldering iron so that the cord does not get caught up in your arms or on others.
Ensure access to proper ventilation.
Verify that the type of solder is safe to use in your working environment.
Secure the components to be soldered before beginning the soldering process.
The next few slides address safety rules related to soldering. Be sure to cover any additional safety rules that are specific to your classroom/laboratory or school.
Project Lead The Way, Inc.
Copyright 2009

11. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Safety
Provide plenty of space to work.
Use a properly-sized point for the soldering job to be completed.
Verify that the tip on the soldering iron has a sharp point and has not been damaged in any way.
Check the power cord for burned or melted sections that show bare wires. Label those cords DO NOT USE and ask the teacher to repair or replace.
Do not to touch molten solder - it is hot!
Make sure that the solder strand is long enough to keep fingers away from the hot iron.
Project Lead The Way, Inc.
Copyright 2009

12. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Soldering Safety
Thoroughly wash your hands after handling solder.
Project Lead The Way, Inc.
Copyright 2009

14. END

15. Soldering Components

17. Student Hands On Training Workshop (SHOT 2007)
Soldering
Iron
Solder Process
June , 2007

18. Student Hands On Training Workshop (SHOT 2007)
Move soldering iron until tip is
touching wire & solder pad
Solder Process
June , 2007

19. Student Hands On Training Workshop (SHOT 2007)
Move solder to touch edge of tip.
Solder
Solder Process
June , 2007

20. Student Hands On Training Workshop (SHOT 2007)
Hold until solder melts
on tip by wire
Solder
June , 2007

21. Student Hands On Training Workshop (SHOT 2007)
Move solder back to touch wire only
Solder
Solder Process
June , 2007

22. Student Hands On Training Workshop (SHOT 2007)
Move solder in to form a
small pocket
Solder
Solder Process
June , 2007

23. Student Hands On Training Workshop (SHOT 2007)
Move soldering iron tip up. This
will drag solder up with it.
Solder
Solder Process
June , 2007

24. Student Hands On Training Workshop (SHOT 2007)
Solder joint should look shinny.
June , 2007

25. Student Hands On Training Workshop (SHOT 2007)
Soldering Tips
Make sure the soldering iron tip is hot.
Clean & tin the soldering iron tip.
Keep the soldering iron tip clean by using wet sponge and cloth.
Heat until the parts are hot enough to melt solder.
Hold until solder flashes around pad
Do not put too much solder on
June , 2007

26. ADD YOUR COMPONENT
Pushing the wires through the holes PC board.

27. ADD YOUR COMPONENT
Bend over all of the wires you’re not going to solder now.

28. CLEAN THE POINT OF THE IRON
Take away any dirt on a damp (not soaking wet) sponge when the iron is heated up.
This will help your solder to flow properly.

29. ”TIN” THE IRON.
This just means you should melt a tiny bit of solder onto the point.

30. HEAT YOUR COPPER TRACK by holding the iron’s point on it for 3 seconds.

31. TOUCH THE SOLDER WIRE ONTO THE TRACK and heat it quickly from above with the iron.

32. Liquefy just enough solder to make the joint and then pull the iron away.

33. GOOD: The join is complete and will hold in place.
GOOD AND BAD ATTEMPTS
GOOD: The join is complete and will hold in place.
BAD: Not enough solder applied. No join.

34. Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
A Good Solder Joint
Smooth
Bright
Shiny
Clean
Characteristics of a good soldering joint.
Project Lead The Way, Inc.
Copyright 2009

35. Bad Solder Connections
Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Bad Solder Connections
Too Much Solder
Too Little Solder
Project Lead The Way, Inc.
Copyright 2009

36. Bad Solder Connections
Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Bad Solder Connections
Cold Solder Joint
Not Soldered
Project Lead The Way, Inc.
Copyright 2009

37. Bad Solder Connections
Soldering & Desoldering
Digital Electronics TM
1.1 Foundations and The Board Game Counter
Bad Solder Connections
Solder Bridge
Lifted Trace/Pad
Project Lead The Way, Inc.
Copyright 2009

38. END