Electronics Forum | Mon May 28 09:37:02 EDT 2007 | davef
Look here: http://www.aimsolder.com/techarticles/Time%20Above%20Liquidus.pdf We have no relationship, nor receive benefit from the company referenced above.
Electronics Forum | Thu May 10 08:09:52 EDT 2007 | davef
There is no standard for time above liquidus. It is described rather broadly by the solder paste supplier. Reflow Zone: If the temperature is too high, boards may char or burn. If the temperature is too low, cold and grainy solder joints will resul
Electronics Forum | Wed May 09 17:13:06 EDT 2007 | zanolli
Re: 63/37 paste reflow Is there a standard reccomended time (ball park) above liquidus? What are the negative ramifications if the TAL is too short or too long? Thanks in advance
Electronics Forum | Thu May 10 08:05:22 EDT 2007 | pjc
30 to 90 seconds TAL is typical.
Electronics Forum | Fri Nov 30 06:16:25 EST 2007 | aj
Hi all, What do most of you aim for when profiling BGAs ? Currently I aim for time above 60 or 70 secs but I read a report that 40 secs would be more suitable. Also peak temp - I aim for 240-245 but again this report stated 230-235. any input app
Electronics Forum | Fri May 25 13:38:15 EDT 2007 | mfgengr
TAL Too Long - dull solder joints, dewetting. TAL Too Short - cold solder, insufficient wetting. You want TAL to be as short as possible (but not lower than 30 seconds), but long enough for every solder joint to be above TAL for at least 30 seconds.
Electronics Forum | Fri May 18 12:09:20 EDT 2007 | ed_faranda
I have been TAL around 45 to 90 seconds. I prefer the longer TAL so, I set my profiles around 80 seconds. In the old days (Before RoSH), the longer times would help with wetting. But, since Lead-Free, well. We all know the story about wetting now
Electronics Forum | Sun May 23 11:05:26 EDT 1999 | M Cox
| I'm putting up an SMT/PTH/Hybrids shop in the Philippines and it is a fire drill. I want anything in the North America. Background PCBA Assembly, build factories, run same. Mostly in Asia, but some Mexico, Puerto Rican experience, speak spanish. |
Electronics Forum | Sun May 23 11:09:44 EDT 1999 | Cunli Jia @ SMTnet
| Try using the Career Center- link above | So that we don't turn this into a Job Hunting Forum. Mike, Thank you for helping enforce the "no ad" rule. I was just deleting his message when you replied. Regards, Cunli
Electronics Forum | Fri Jun 22 13:14:46 EDT 2007 | jmelson
Are you sure your units are correct? Is this in the exhaust duct or actually in the reflow area? 4000 FPM = 67 FPS or 45 MPH (73 km/H). I have no doubt such a wind would blow larger parts off the board. If this is only in the exhaust ducting, the
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