EPAS 3

• Soldering


  Process of combining two or more metal through melting a filler metal-solder lead- and allowing them to flow between joints
• Soldering


  • Allows electronic components to be electrically joined and held in place
  • Used to make a permanent and stable connection between joints
• How to solder

  1. Mount the component to the PCB

  2. Heat the joint

  3. Apply solder

  4. Cut extra leads
• Good solder procedure


  Smooth and shiny finish<|>Volcano-shaped solder
• Rearrange soldering procedures

  1. Mount the component to the printed circuit board

  2. Plug the soldering iron to the AC power cord

  3. Apply solder to the copper plate and the terminal joint

  4. Cut extra terminal leads of the component

  5. Clean the tip of the soldering iron
• Poor soldering conditions


  • Too much flux
  • Interior solder gap
  • Cold solder
  • Excess solder
  • Burned insulation
  • Insufficient solder
  • Bridge
• Soldering is used in the assembly of electronic circuits and products
• Learning soldering principles will provide a concept on how electronic products are being assembled
• Cold solder


  Solder finish is rough
• Fixing cold solder

  Remove old solder and replace with new
• Excess solder


  Solder flowing in any direction
• Fixing excess solder


  Reduce amount of solder supplied
• Burned insulation


  Insulator of terminal being soldered is burning
• Burned insulation


  • Indication of poor solder
  • May burn insulator by excessive heat exposure
• Insufficient solder


  Joint terminals being soldered are visible
• Fixing insufficient solder

  Increase amount of solder supplied
• Bridge


  Short circuit from one base metal to another
• Avoiding bridge


  Do not expose to excessive heat or oversupply of solder
• Tinning the soldering iron tip


  1. Attach tip securely

  2. Heat up for 5-10 minutes or set to 400°C

  3. Wipe tip with wet sponge

  4. Check if solder flows evenly
• Tinning the soldering iron tip

  Improves heat transfer<|>Protects and reduces wear of tip
• Desoldering


  1. Touch pre-heated soldering iron to part/component

  2. As solder melts, use solder sucker to suck up melted solder

  3. Empty solder sucker vacuum tube
• Solder wick and desoldering braids can also be used to remove solder
• Safety precautions in soldering

  • Work in well-ventilated space
  • Use protective clothing
  • Use safety goggles/face shields
  • Return soldering iron immediately after use
  • Unplug soldering iron when not in use
  • Never touch heating element/tip
  • Wash hands after using solder
• Knowing basic soldering principles and safety measures is important