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BASIC HAND SOLDERING

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most common type for hand soldering has a composition of Tin (Sn60) and Lead ... contains internal core of non-corrosive Rosin Mildly Activated (RMA) flux ... – PowerPoint PPT presentation

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Title: BASIC HAND SOLDERING


1
  • BASIC HAND SOLDERING
  • MULTICORE SOLDER
  • most common type for hand soldering has a
    composition of Tin (Sn60) and Lead (Pb40), with
    a diameter of 0.71 mm
  • contains internal core of non-corrosive Rosin
    Mildly Activated (RMA) flux
  • has a plastic stage between the melting and
    solidifying stages

2
  • Dry joints are caused through
  • movement of joint during plastic stage
  • thermal stress
  • PCB contamination
  • oxidisation

BASIC HAND SOLDERING
3
BASIC HAND SOLDERING
  • TIPS
  • appropriate size and width is determined by the
    size of the connection to be made
  • ideally 2/3 to equal the diameter of the pad
  • tips should be correctly 'tinned at all times,
    by adding a small amount of solder to the hot tip

4
BASIC HAND SOLDERING
  • LEAD FORMING
  • minimum distance from the end of the component
    body to the start of the lead bend is usually 2
    lead diameters or 1.5mm for hand bending methods
  • without undue pressure hold the component lead
    with the pliers and bend the lead protruding
    beyond the pliers with a finger until a 90 degree
    angle is formed.
  • if damaged discard component

5
BASIC HAND SOLDERING
  • COMPONENT MOUNTING
  • Radial leaded loaded slightly off the PCB (0.3 -
    3.0mm)
  • Axial-leaded loaded with the body of the
    component very close to the PCB (0.3 - 3.0mm)

6
BASIC HAND SOLDERING
  • BENDING AND MOUNTING OF COMPONENTS
  • mounted centrally between the holes
  • resistors mounted so colour code orientated in
    the same direction
  • polarised components should be orientated so that
    polarity symbols ( or - ) and component value
    are visible

7
BASIC HAND SOLDERING
  • LEAD TERMINATIONS
  • TYPE 1 FULLY CLINCHED
  • bend the lead flat against the pad
  • trim the lead to a length of between 1-2 lead
    diameters
  • Used in High Quality/High Reliability military or
    life support applications
  • difficult to rework
  • TYPE 2 SEMI-CLINCHED
  • bend the lead to an angle of approx. 45?
  • Cut to a minimum of 0.5mm and a max. of 1.5mm, or
    between 1-2 lead diameters
  • Used for commercial applications
  • ease of de-soldering
  • TYPE 3 RIGID LEAD TERMINATION
  • straight through termination
  • Cut to a length of min. 0.5mm and max. of 1.5mm,
    or between 1-2 lead diameters

8
BASIC HAND SOLDERING
  • CONSTRUCTING A GOOD SOLDER JOINT
  • Figure a) the amount of solder applied is minimal
    and may result in a poor electrical connection
    over time.
  • Figure b) shows the optimal solder joint that has
    good wetting between component lead and PCB pad.
  • Figure c) indicates an excessive amount of solder
    has been applied to the connection.

9
BASIC HAND SOLDERING
  • CLEANING
  • a process of removing contaminates before and
    after soldering
  • ensures good mechanical/electrical connection
  • Three different methods
  • Mechanical - scourer or bristle brush
  • Chemical - solvents eg. Isopropyl Alcohol
  • Thermal - solder pot

10
BASIC HAND SOLDERING
  • BASIC SOLDERING PROCEDURE
  • iron temperature is set at approx. 350?
  • soldering iron tip size is suitable
  • solder sponge is damp
  • tip is clean and shiny (wipe tin)
  • Apply flux (RMA) to help wetting if necessary
  • soldering iron at a 45? angle

11
BASIC HAND SOLDERING
  • BASIC SOLDERING PROCEDURE
  • heat the lead and the pad simultaneously
  • flowing solder around the joint forms a heat
    bridge
  • remove soldering iron and solder simultaneously
    (prevents spiking)
  • clean the PCB with Isopropyl Alcohol and a
    bristle brush
  • wipe or pat dry with a lint free tissue to remove
    traces of residue.

12
BASIC HAND SOLDERING
  • Use appropriate safety equipment
  • fume extractors
  • hand cleaners
  • goggles
  • READY TO SOLDER
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