Surface Mount Soldering Nick Carter12022016 This was taught at Nova Labs by Bob Coggeshall novalabsorg Meetup NovaMakers Reston See notes page for this ppt application ID: 584683
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Slide1
A Different Soldering Class“Surface Mount Soldering”
Nick Carter12/02/2016
This was taught
at Nova Labs by
Bob
Coggeshall
nova-labs.org
Meetup Nova-Makers Reston
.
See notes page for this ppt. application.
Slide2
Have you Noticed??
Soldering Can Be Smelly
Cool
HOT
Peeuuu
!
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
`Slide3
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.Slide4
Resistor
paste
paste
Resistor
Solder
HEAT
Circuit wire
Component
“wire”
Paste
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 padThe component is placed on the pads with connection areas contacting the solder paste.The board and components are heated until the solder melts and joins the components to the board.Slide5
Bare Board and Components
Solder PasteSlide6
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 removedWhy don’t the components fall off?The paste is sticky when coolSurface tension pulls them to the board when the solder meltsWhen they cool the solid solder “glues” them to the boardFor big components, additional glue can be usedSlide7
Surface Mounting Soldering Station
Soldering Iron
Hot air blower
Hot Air Nozzles& toolsSlide8
Compare our Boards
transistor
LED
resistorcapacitorswitchFIND THE>>>>>>integrated circuit
c
onnector
Surface Mounted
Through Hole MountedSlide9
Compare our Boards
transistor
LED
resistorcapacitorswitchFIND THE>>>>>>integrated circuit
c
onnector
Surface Mounted
Through Hole Mounted
Nope!
Gotcha
-
hahaSlide10
Putting the Solder Paste On
Hand application
Screen PrintingSlide11
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 lotPutting the solder paste on – e.g. screen printingPutting the components on – robot with vacuum sucker to grip the componentsContinuous movement of boards through an oven to heat them.Slide12
Putting the Components on
Components are put on plastic tape, on reels
Robotic tool takes component from tape and puts it onto board paste location.
BoardSlide13
Heating the Boards
Continuous reflow
oven melts
solder then cools boardSlide14
Test and Repair
We tested by connecting the battery
More complicated boards are tested by machines and bad ones sent for repair or scrap