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Author Topic: Soldering tip, flux suggestions  (Read 598 times)
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Pottstown, PA
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I have a Hakko soldering station and up to now have been using paste flux. I would like to start using a flux specpfically meant for electronic soldering. Please give suggestions for pen , brush-on, etc. fluxes. Also, I may be attempting soldering a QFN device, most likely using a schmartboard. I'd also like suggestions on tip size and shape to use. Thanks - Scotty
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Grand Blanc, MI, USA
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This is not a Hakko tip, but this is the one I use most with my Weller, maybe you can find something close from Hakko.  I've done 0.5mm pitch ICs with it, but get some desoldering braid too.
https://www.all-spec.com/products/ETH.html
https://www.all-spec.com/products/1820-10F.html

The flux pen I use most for SMT
https://www.all-spec.com/products/KF95105.html

Something a little more aggressive
https://www.all-spec.com/products/KF18615.html

You didn't ask but my favorite solder
https://www.all-spec.com/products/KW24510.html
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Fort Lauderdale, FL
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The flux pen I use most for SMT
https://www.all-spec.com/products/KF95105.html
I'm also a fan of this flux pen.  I also use it on de-soldering braid when I need to desolder.  I soak the braid from the flux pen, then it does wonders for de-soldering, especially fine pitch-leaded components. 
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Central Florida or South Wales UK
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Some great tips I didn't know about (havent done much soldering)
I didn't know solder flux has a shelf life until now, could explain a few failures I've had over the last few years (flux cred solder is probably 25 yrs old  smiley-roll )
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I may be attempting soldering a QFN device, most likely using a schmartboard. I'd also like suggestions on tip size and shape to use. Thanks - Scotty
I recently soldered QFN32 chips on Schmartboard and it worked quite well. You ideally need a tip that is as small or smaller than the trace width but mine was slightly to big (it would ride the groove but not touch the bottom to melt the pre-applied solder) so I put a tiny amount of solder paste in the ends of the groves away from the centre of the board to give a higher solder pool when pushing the tip down the groove. I also soldered some QFP32 chips using conventional solder paste & stencil and the
Schmartboard was easier & quicker for me.
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Grand Blanc, MI, USA
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Drag-soldering works amazingly well.  Remove any bridges with desoldering braid.  Once cleaned up, the finished product can look very good indeed.

I see Hakko has a tip with a concave end that they say is good for drag soldering.  I just use the same 1/32" tip on my Weller iron that I use for just about everything, but I should check to see if they make a similar concave tip.

http://www.hakko.com/english/tip_selection/work_drag.html
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