CLICK HERE FOR INDEX PAGE
REVISION CARDS - SOLDERING
V. Ryan © 2013
|PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET|
Stage one: Clean the track side of the PCB with wire wool or a PCB eraser.
Stage two: Position the components, checking they are in the right position and the correct way round.
Stage three: Clean the tip of the ‘hot’ soldering iron, by wiping it on a damp foam pad.
Stage four: Heat both the component and the copper track and then apply the solder.
WHAT IS SOLDER?
Electronic components are metallurgically joined to the copper tracks of a PCB, using solder. Solder is an alloy of tin and lead (63% tin and 37% lead).
Lead is toxic. Consequently, lead free solder is popular. The lead has been removed and replaced with other metals. However, these solders work at higher temperatures.
GOOD AND BAD JOINTS
Good soldering produces a ‘concave’ solder joint. The soldering iron must be at the right temperature, applied to the track and ‘wire’ for the right amount of time, with a ‘small’ amount of solder applied.
|1. Describe soldering components to a PCB , in four simple stages. 4 marks|
|2. What is solder? Why is lead free solder popular? 3 marks|
|CLICK HERE FOR PCB INDEX PAGE INDEX PAGE|