Electronics Forum | Tue Jan 13 20:52:21 EST 2004 | davef
Bismuth Solder alloys * Fatigue life is reduced when soldered to hot air solder leveled (HASL) boards. * Lead from Hot Air Leveling (HAL) coatings can diffuse through the grain boundaries of alloy. * Lead is bismuth alloys can form a eutectic composi
Electronics Forum | Thu Aug 12 05:33:23 EDT 1999 | Brian
| | (snip) | | | | You're quite right. However, anyone who uses MeCl in an aerosol spray needs his head examining. I'll go further: if he continues, he will most CERTAINLY need his head, the rest of his CNS and his liver examining a little later on
Electronics Forum | Thu Aug 12 22:23:23 EDT 1999 | Dave F
| | | | (snip) | | | | | | You're quite right. However, anyone who uses MeCl in an aerosol spray needs his head examining. I'll go further: if he continues, he will most CERTAINLY need his head, the rest of his CNS and his liver examining a little
Electronics Forum | Fri Aug 13 10:39:25 EDT 1999 | Boca
| | | | | | (snip) | | | | | | | | You're quite right. However, anyone who uses MeCl in an aerosol spray needs his head examining. I'll go further: if he continues, he will most CERTAINLY need his head, the rest of his CNS and his liver examining a
Electronics Forum | Fri Jul 15 16:50:04 EDT 2005 | davef
Few of us here on SMTnet fabricate our bare boards. Most of us are assemblers. So, the solderability of the connections of our boards is a BIG issue with us. Our suppliers protect the solderability of the copper by coating the copper to limit the
Electronics Forum | Sun Apr 25 10:28:46 EDT 1999 | Joe Cameron
Hello all, Been doing some comparisons on joints made using the soldering iron versus reflowed solder paste (on a QFP package). The difference is quite significant: the joints made by the soldering iron are inconsistent and in many cases not filled
Electronics Forum | Mon Dec 11 15:12:20 EST 2000 | accuspec
we are using alphametals no clean 95sn/5ag CL775 paste. After reflow there are solder balls on the board. mainly are around the cap. We are using a conceptronic concept 60 air. There are 4 zones with 8 chambers. We are not sure what the profile
Electronics Forum | Fri Nov 17 17:34:26 EST 2006 | realchunks
OK, why are you hand fluxing? You may want to take the time to use your real fluxer. Yeah, it's a bit messy but you can control the amount of flux you're putting on the board. And with water based fluxes, this is critical. If you are stuck to han
Electronics Forum | Wed Jul 29 07:06:44 EDT 2009 | patrickbruneel
Deni, This looks more like webbing and not flux residue. Webbing is caused by not enough flux to protect the surface resulting in oxide webs sticking to the board surface. The insufficient flux can be caused by: - Weak flux foam head - Air knife p
Electronics Forum | Fri Aug 21 07:38:34 EDT 1998 | Tryin'
| | Will somebody please explain HASL (here). Thanks. | Tryin: HASL: Hot Air Solder Leveled. A board fabrication process that applies an oxidation preventing solder coating to copper pads on the board. Dave F You do this to keep the green stuff (
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