TOPIC 1B-SOLDERING TECHNIQUES FOR STUDENTS
Download as PPTX, PDF0 likes49 views
The document covers soldering techniques and tools essential for electronic equipment repair, emphasizing the use of various soldering irons and guns. It explains the importance of proper soldering methods, joint inspection, and common issues like cold and dry joints, alongside a discussion of desoldering techniques. Additionally, it outlines safety procedures and the correct solder compositions for different applications.
TOPIC 1B-SOLDERING TECHNIQUES FOR STUDENTS
- 1. OBJECTIVE: REMEMBER SOLDERING TECHNIQUE AND SOLDERING TOOLS. CLO1- Diagnose fault of electronic equipment related to electronic equipment repair using the correct diagnosis technique and tools. ( C4 , PLO 2 ) 1 TOPIC 1 – Soldering Technique
- 2. Soldering Irons Soldering much like irons a pen best are more traditional and are held between the fingers. For electronics work the type is one powered by mains electricity (240V), it should have a heatproof cable for safety. The iron's power rating should be 15 to 25W and it should be fitted with a small size bit for the job of 2 to 4mm diameter board or PCBs. is fine for normal work with strip 2 Soldering Tools TOPIC 1 – Soldering Technique
- 3. Soldering Soldering soldering Guns guns have overtaken more traditional irons in popularity because they’re more versatile. The tip is made of a loop of copper wire so it both heats and cools quickly. Because of this, you should only operate soldering guns for short periods of no more than 30 seconds at a time. Typical soldering guns are rated at 100 to 240 watts power. The temperature of the soldering tip is regulated manually by holding the button until the solder melts, and then releasing it. 3 Soldering Tools TOPIC 1 – Soldering Technique
- 4. Importance of heating power of the soldering tools Soldering irons with higher wattage ratings heat quickly to achieve a molten state. The higher power need to melt the soldering lead. solder more temperature Higher wattage ensures that the operating temperature smaller drop remains consistent as the tip will experience a when applied to joints. Low-end soldering irons usually feature 15W – 25W power supplies without temperature adjustment, whereas 40W – 200W and more irons with adjustable temperature to be sure that the soldering iron tip maintains the right temperature. High temperature means a risk of a component overheating. 4 Soldering Tools TOPIC 1 – Soldering Technique
- 5. Solder Sucker A tool for removing excess solder from a it a joint. latches. When Heat the the and plunger is fully pushed in, solder to be removed using soldering iron, place the tip of the desoldering pump on the solder. Press the button on the desoldering pump and the plunger drawing in the molten solder. will spring back, 5 Desoldering Tools TOPIC 1 – Soldering Technique
- 6. Solder wick This is an alternative to desoldering. The solder lead is remove by heat to the iron on the but once it heating the solder wick. Before applying any joint, lay the wick over it and put wick. It will take a second or two is hot you will feel the wick slide. the tip of the to heat up, You should also see the solder flow into it. You probably won't have to repeat this step. Once a section solder, it is used up and must be replaced. of wick is filled with 6 Desoldering Tools TOPIC 1 – Soldering Technique
- 7. What Is Soldering? Soldering is the process of joining two or more electronic parts together by melting solder around the connection. Solder is a metal alloy and when it cools it creates a strong electrical bond between the parts. Even though soldering can create a permanent connection, it can also be reversed using a desoldering tool. 7 Soldering TOPIC 1 – Soldering Technique
- 8. Tinning The Tip Before you can start soldering, you need to prep your soldering iron by tinning the tip with solder. This process will help improve the heat transfer from the iron to the item you’re soldering. Tinning will also help to protect the tip and reduce wear. Step 1: Begin by making sure the tip is attached to the iron and screwed tightly in place. Step 2: Turn on your soldering iron and let it heat up. If you have a soldering station with an adjustable temp control, set it to 400C. Step 3: Wipe the tip of the soldering iron on a damp wet sponge to clean it. Wait a few seconds to let the tip heat up again before proceeding to step 4. Step 4: Hold the soldering iron in one hand and solder in the other. Touch the solder to the tip of the iron and make sure the solder flows evenly around the tip. 8 Soldering TOPIC 1 – Soldering Technique
- 9. You after should tin the tip of your iron before and each soldering session to extend its life. Eventually, every tip will wear out and will need replacing when it becomes rough or pitted. 9 Soldering Technique TOPIC 1 – Soldering Technique
- 10. How To Solder Touch the soldering iron onto the joint to be made. Make sure track. Hold it touches both the component lead and the the tip there for a few seconds. Fee d a little solder onto the joint. form a It should flow smoothly onto the lead and track to volcano shape. Apply the solder to the joint, not the iron. Remov e the solder, then the iron, while keeping the joint still. Allow the joint a few seconds to cool before you move the circuit board. 10 Soldering Technique TOPIC 1 – Soldering Technique
- 11. Picture : Soldering 11 Soldering Technique TOPIC 1 – Soldering Technique
- 12. • Inspect the joint closely. It should look shiny and have a 'volcano' shape. If not, you will need to reheat it and feed in a little more solder. This time ensure that both the lead and track are fully heated before applying solder. 12 Soldering Technique TOPIC 1 – Soldering Technique
- 13. Cutting the Leads It's best to use a sharp wire cutter that has just one side of its cutting edge beveled. This way you a smooth flat cut when you cut off the lead. can get Holding a good onto the excess lead little when you cut it off is way to place. keep the ends from getting all over the Picture: Removing the excess lead 13 Soldering Technique TOPIC 1 – Soldering Technique
- 14. A. Cool Solder Joint A "cold solder joint" can occur when not enough is applied to the component, board, or both. A joint is brittle and prone to physical failure. It is heat cold also generally a very high resistance connection which can effect the operation of the circuit or cause it to fail completely. 14 Type Of Bad Soldering TOPIC 1 – Soldering Technique
- 15. B. Dry Joint Applying too little solder will result in a dry and unreliable joint. Solder should around completely fill printed circuit being board pads all the component lead soldered. 15 Soldering Technique TOPIC 1 – Soldering Technique
- 16. C. Bubble Solder Joint Too much solder applied to joints pose the possibility of unwanted solder bridges between Excess solder and unconsumed flux adjacent joints. and iron residue is sometimes joints. wiped from the soldering tip between 16 Soldering Technique TOPIC 1 – Soldering Technique
- 17. Ratio Pb/lead in soldering lead compound Soft soldering wire that contains lead is comprised of combinations of tin (Stannum-Sn), lead (Plumbum- Pb), silver (Argentum-Ag), cadmium(Cadmium-Cd) and copper (Cuprum-cu). Combinations of tin and lead are most common, in ratios of 60 percent tin/40 percent lead (Sn60Pb40); 63 percent tin/37 percent lead (Sn63Pb37); and 50 percent tin/50 percent lead (Sn50Pb50). These solders melt in a range from 361 to 421 degrees with the higher the percentage of lead, the higher the melting point. 17 Soldering Technique TOPIC 1 – Soldering Technique
- 18. Lead-free soldering wire is comprised of various combinations of tin, copper, silver and antimony. Pure tin wire has the highest melting point of 449 degrees. 18 Soldering Technique TOPIC 1 – Soldering Technique
- 19. Soldering and desoldering station consists of complete bench-top control unit into which a special low-voltage soldering iron is plugged. Some versions might have a built-in digital temperature readout, and the will have setting. a control knob to enable you to vary 19 Soldering and Desoldering Station TOPIC 1 – Soldering Technique
- 20. Standard Operating Procedure (SOP) Soldering 1. Turn On the power and adjust the tip temperature to suit the required thermal transfer during soldering (nominally 400 C for tin/lead solder, 450 C for lead- ⁰ ⁰ free). Place the soldering iron/heat gun back in the stand immediately following each use. Avoid positioning your head directly over the soldering process. Soldering creates flux fumes that can irritate the lungs and eyes, and may cause sensitization. 2. 3. 20 Soldering and Desoldering Station TOPIC 1 – Soldering Technique
- 21. 4. Clean the hot tip with either the brass coil or a damp sponge before tinning. “Tin” the tip by placing some solder onto the iron. This allows for more thermal conductivity with the conductor you are about to solder. Holding the soldering iron on the copper pad and the lead and touch your solder to the joint. Be careful the tip does not also touch nearby components so as not to heat them up. Remove the soldering iron and let the solder cool down naturally. Don’t blow on the solder as this will cause a bad joint. 5. 6. 7. 21 Soldering and Desoldering Station TOPIC 1 – Soldering Technique
- 22. Desoldering 1. To desolder a joint, place desoldering gun on top of the joint/solder you want removed. 2. After confirming that joint/solder has completely melted, absorb the solder by pressing on the gun. the trigger 3. Clean the filter and dampen the sponge frequently during and after usage to allow better suction power. 22 Soldering and Desoldering Station TOPIC 1 – Soldering Technique
- 23. Turn off the power switch. 1. Ensure that the before switching soldering iron tip is well tinned off the soldering iron. 2. Switch off, unplug, and allow the soldering iron/heat gun to cool down before storing. Leave work bench in a safe, clean and tidy state. When using solder containing lead wash hands after completion. 3. 4. 23 Soldering and Desoldering Station TOPIC 1 – Soldering Technique