Introduction to Soldering - Proper Soldering and Mounting

electronics

1. Welcome Again Learners

2. Soldering is defined as “ the joining of metals by a fusion of alloys which have relatively low melting points”. Fusion - Fusion occurs when two light atoms bond together, or fuse, to make a heavier one. Alloys - metallic substance composed of two or more elements, as either a compound or a solution

3. These two metals are tin and lead. In the study of science, it defines the following terms: Metal:  is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. 

4. Tin (Sn) – Tin is a soft, pliable, silvery-white metal. Tin is not easily oxidized and resists corrosion because it is protected by an oxide film. Tin resists corrosion from distilled sea and soft tap water, and can be attacked by strong acids, alkalis and acid salts.

5. Lead (Pb) - Lead  is a bluish-white lustrous  metal . It is very soft, highly malleable, ductile, and a relatively poor conductor of electricity. It is very resistant to corrosion but tarnishes upon exposure to air.  Lead  isotopes are the end products of each of the three series of naturally occurring radioactive elements.

6. Soldering is more like gluing with metals than anything else.

7. Soldering a must have skill for all sorts of electrical and electronics work. It is a skill that must be taught properly and developed with practice.

8. QUALITIES OF A GOOD SOLDER The solder connects the component terminal with the copper side of the PCB. A good solder is shiny, and has a volcano or has a cone-like shape.

9. Japan's Mt. Fuji is an active volcano about 100 kilometers southwest of Tokyo .

10. SOME GOOD SOLDERS

11. BAD SOLDERS OR COLD SOLDERS

12. THE SOLDERING PROCESS Plug in the soldering iron. Wait until the soldering tip becomes hot. Try it by melting a little amount of solder/lead.

13. Do the tinning process.. Tinning process cleans the tip of the soldering iron.

14. Objectives of the session At the end of this session, learners will be able to define soldering, mount and solder components properly; and differentiate good and bad solder connections

15. Materials needed: Soldering Iron - Desoldering tool Soldering Stand Lead/solder PCB Boards (drilled) Components Longnose Side Cutter Sanitizer

16. MOUNTING OF COMPONENTS -To mount components properly, use appropriate tools like long nose and side cutter

17. Component leads not properly mounted to the PCB may result to bad joints. Component leads/terminal must be perpendicular to the PCB.

18. Long terminal leads may cause short circuit because it may touch other components. Too much close to the PCB can generate heat faster. Give component ventilation. Bend the components properly.

19. CORRECT OR WRONG? A. B.

20. More… C. D.

21. E. F.

22. Bend the components and mount it in the PCB board. Observe proper bending and spacing. At least one millimeter.

23. - Soldering irons were then used to the many pieces of jewelry, tools and weapons we know from the Bronze Age. ( third phase in the development of material culture among the ancient peoples of Europe, Asia, and the Middle East, following the Paleolithic (Old Stone Age) and Neolithic periods (New Stone Age).

24. Mount the component into the PCB board - Maintain a gap/space between the PCB band the component for air entrance and exit. Too much heat may damage components.

25. Hold now the soldering iron like a pen. Never touch the metal part. It may cause nasty burn on skins.

26. Let the soldering iron tip touches the component lead and the copper side of the PCB. Then put the lead wire to melt. Detach first the lead wire before the soldering iron.

27. After soldering, detached the lead wire first from the PCB and component terminal before finally removing the soldering iron. Return the soldering iron to its stand when not in use.

28. Cut the excess terminals using side cutter in downward position.