A Different Soldering Class Surface Mount Soldering Nick
- Slides: 14
A Different Soldering Class “Surface Mount Soldering” Nick Carter 12/02/2016 This was taught at Nova Labs by Bob Coggeshall nova-labs. org Meetup Nova-Makers Reston. See notes page for this ppt. application.
Have you Noticed? ? Soldering Can Be Smelly u! uu e e P Co ol HO T Solder will stick to clean objects much better and conduct electricity better. ` The solder contains little strands of flux inside The heat turns the FLUX into a gas that we can smell. FLUX cleans dirt from the objects being soldered
Why I Took THIS Soldering Class • I have worked as an Electronics Engineer for 50 years but………. . • I only soldered components with wires • This class taught how to solder components with NO WIRES. I wanted to do it myself. • The components are called Surface Mounted components because DUH…. • They fasten to the board surface (need no holes) This class is not just for adults. Kids who can follow directions can come with their parents to learn this too.
How It Works • The component are connected to the board with solder. – It makes the electrical connection – It “glues” the component onto the board • Little beads of solder are made into a paste with “flux” • The paste is put on the connection pad • The component is placed on the pads with connection areas contacting the solder paste. Component “wire” Resistor paste Paste Resistor paste HEAT Circuit wire Solder • The board and components are heated until the solder melts and joins the components to the board.
Bare Board and Components Solder Paste
Soldering the Components • How are they heated? – The whole board and components can be put in an oven – Individual components can be heated with a hot air blower like a special hair dryer (but hotter) – Once the solder melts and connects the components the heat can be removed • Why don’t the components fall off? – – The paste is sticky when cool Surface tension pulls them to the board when the solder melts When they cool the solid solder “glues” them to the board For big components, additional glue can be used
Surface Mounting Soldering Station Hot air blower Soldering Iron Hot Air Nozzles & tools
Compare our Boards Surface Mounted Through Hole Mounted FIND THE>>>>>> resistor capacitor transistor LED switch integrated circuit connector
Compare our Boards Surface Mounted Through Hole Mounted FIND THE>>>>>> capacitor integrated circuit resistor transistor LED switch connector Nope! Gotcha - haha
Putting the Solder Paste On Hand application Screen Printing
Why Do It This Way? • Components are smaller – boards can be smaller – everything is cheaper. • It is easier to do using machines for making a lot – Putting the solder paste on – e. g. screen printing – Putting the components on – robot with vacuum sucker to grip the components – Continuous movement of boards through an oven to heat them.
Putting the Components on Robotic tool takes component from tape and puts it onto board paste location. Board Components are put on plastic tape, on reels
Heating the Boards Continuous reflow oven melts solder then cools board
Test and Repair • We tested by connecting the battery • More complicated boards are tested by machines and bad ones sent for repair or scrap
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