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Pics: Hot Plate Soldering...On a Kitchen Stove

Discussion in 'Electronic Design' started by D from BC, Jan 5, 2008.

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  1. D from BC

    D from BC Guest

    Poorman hot plate soldering.. on my kitchen stove. :p

    Some photo blurring added to pcb..

    wtf :(
    I prefluxed the board with water soluble rework flux expired 2003.
    Looks like the copper has a baked on residue??
    I tried water. Then methyl alcohol. Zip.. MEK will probably kill the
    Oh conformal coating :p

    But the soldering turned out great!
    No shorts or opens found yet..


    D from BC
  2. gearhead

    gearhead Guest

    I experimented placing a pc board on a metal screen over a halogen
    light. That works, actually if you position the board very near the
    light it can melt the solder in a matter of seconds.

    With techniques like you and I are using, one ought to consider the
    mechanical stresses on the parts resulting from uneven heating and
    cooling. It might be a good idea to preheat the whole assembly. I'm
    thinking maybe use a dimmer, heat the assembly at low power until the
    whole thing is at 150 C or so, then turn the power up just long enough
    to melt the solder, then off.

  3. One comment Do NOT dip the damned thing, float it, and then "peel" it
    off the float at an angle to keep from forming icicles. Also, pre-heat
    the assembly in a toaster oven or such before the dip, as the shock of
    dipping a cold assembly is harmful to many of the parts, particularly
    plastic encapsulated IC chips.

    The tile is a nice addition.
  4. D from BC

    D from BC Guest

    Accepting free hot plate donations :)

    D from BC
  5. D from BC

    D from BC Guest

    The thermal rise and fall might be too sluggish.
    After preheat, there's supposed to be a 10 second 'spike' to solder.
    (Ref: Panasonic SMD app sheet soldering profile for chip resistors.)

    On a stovetop, I could set one of the elements to preheat.
    However, I'm not worried about thermal stress with test boards and
    just skip all that.

    By the way, I did try halogen soldering one time.
    Used a 50W reflector halogen siliconed to a metal plate.
    The plate did too much heat sinking :(

    D from BC
  6. D from BC

    D from BC Guest

    ??? I didn't get that part..
    Yeah... the tile was all I could quickly find in the junk box.
    I might try warming up the tile for a preheat. Then shuffle the tile
    near the soldering plate.
    I don't like all the shuffling though :(
    Parts move.

    D from BC
  7. The way the corner of the board appeared to me, it looked as if you
    dipped the whole board into the solder.
    You should only use it for the thru hole parts, and do the SMT work by
  8. D from BC

    D from BC Guest

    I coated the board with flux.
    Applied solder paste on each pad.
    Moved the board onto the tile.
    Shuffled the board onto the hot plate for 20 seconds and then back
    onto the tile.

    I might improve the set up with a larger metal plate with a thermal
    This will make a preheat area on the plate.

    Topview of new plate for stovetop.
    | |________+
    | 245C | 150C |
    ^thermal resistance

    D from BC
  9. I've seen a few write ups on how to convert a toaster oven into a
    soldering oven. The conversion usually involves adding a better temp.
    sensor, programmable controller and triac control of the heating
    elements. The homemade jobs can be set to follow a time vs temperature
    curve optimum for soldering jobs.
  10. D from BC

    D from BC Guest

    I tripped on that on that net..
    Seems like too much work.
    I like my metal plate on the stove top idea.
    Total Cost: $1.50
    Metal plate: 50 cents I think.
    Oven Thermometer: 1 dollar

    Set up time: <5 min.

    Everybody has a stove! :)

    D from BC
    British Columbia
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