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infrared narrow beam heaters ?

Hi all,

Trying to solder QSOP16 packages to a PCB by hand, bascially just have the PCB cooking ontop of a infrared bar heater and simply bunging the IC ontop when the solder melts... apart from getting the IC to align it does a good job at soldering the IC, only problem is the heater burns the board with a

500W bar, I will connect my variac to it and try it at a lower power which should help, though my question is, is there any infrared heaters which can just give a narrow beam of about 5mm ? At least that way I can just heat the IC area and not the entire PCB... Thinking also about any high wattage lights is took down to a narrow beam would probably get hot enough to melt solder....

Using a soldering iron is out of the question in the normal way, I could invest in a flat tip and heat a square on the reverse side of the PCB, that would probably work also....so.. anyone got any ideas for a narrow beam heatsource ?

Cheers, Chris

Reply to
exxos
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Perhaps you could modify a hot air paint stripper to make a small nozzle?

Reply to
CWatters

Yeah, ive actually got a hot air soldering station for doing such things, but since it blows , it blows the solder off the PCB, so you can only really use a IR type thing... They do make 150W IR devices for SMT reworks, fear at the cost of one of those things though!

Chris

Reply to
exxos

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Perhaps you could make a large bit for a soldering iron from something that doesn't wet out with solder easily - perhaps stainless steel or aluminium? Use it to apply heat direct onto all the pins at once.

Reply to
CWatters

For such jobs I use a Weller Pyropen with a hot air nozzle. (They come with 2 sizes hot air nozzles.)

And some proper solder cream, not the wire-type solder :-)

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

Yeah im using the solder paste at the moment, looking to get a none-flame gas soldering iron type thing also, I cant use the paste with a blower since it blows the paste everywhere. ah well.....

Chris

Reply to
exxos

Then try a pyropen. There is neither a flame nor a blow anywhere near 'blowing away the paste'. Use the 1 mm nozzle.

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

Have you tried turning down the air flow on that hot air station and using a board pre-heater?

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James T. White
SPAMjtwhiteGUARD@hal-pc.org

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Reply to
James T. White

any air flow messes it up, I have found that my 22W 12V lamp is the best tool, simply put past on the tracks, plog IC on top, put board ontop of the lamp for about 2 mins and leave to cool, worked first time!

Chris

Reply to
exxos

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Reply to
Larry Oravetz

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