Electronics Forum: heat cycles (Page 10 of 25)

Bottom side SMT wave vs. top side reflow yields

Electronics Forum | Thu Aug 29 20:04:13 EDT 2002 | davef

Steve: I agree. Let�s break it down. * I�d rather print paste than glue any day of the week * But I know yera �Dispenser Boy�. In that case, I�d rather dispense glue than paste. * PTH / primary and SMT / secondary is a tough process either way you

dendritic growth

Electronics Forum | Tue Dec 14 09:32:59 EST 2004 | patrickbruneel

Hi Paul, One thing I can tell you for sure "lead free" is not going to solve your problem, because spectrum analysis have shown that dendrites at there final stage always consists of pure tin. The higher the tin content the higher the risk for dead

BGA opens

Electronics Forum | Sun Jan 28 13:26:27 EST 2007 | Sweet Old Bob

Okay you CM haters I don't see anything about the design of the board, other than OSP which is strike one. What is the board size? What is the board thickness? Where is the BGA located on the board? What is your ball to pad ratio? What is your aspect

BGA reflow on bottomside

Electronics Forum | Wed Nov 21 08:45:33 EST 2007 | davef

Rob: You say, "We usually determine our run process based on the heaviest components, and propensity for falling off during the second reflow process. If there's only the one BGA on that side of the board, we'd tend to run that side first." We agree

Wave soldering - black residue / bridging

Electronics Forum | Fri Dec 27 17:40:55 EST 2019 | rgduval

Using no-clean flux will make the boards very difficult to clean. If you can switch to water soluble flux, your life will be much easier. The "icicles" lead me to think that the board isn't getting hot enough in the pre-heat cycle, and/or there isn

imm. silver

Electronics Forum | Fri Aug 30 16:25:21 EDT 2002 | davef

Imm silver holds-up to multiple thermal cycles very well. The things, we guess, are happening to make imm silver tough to solder after heating and sitting are: * Oxidation of the silver. * Reduction of the co-deposited organic anti-tarnish [used in

short wave IR question

Electronics Forum | Thu Aug 30 20:35:51 EDT 2012 | davef

A common bottomside heater configuration is IR-Convection-Convection. One of the big advantages of the IR zone is its ability to allow the flux carrier to spread and dry slowly before the board reaches the convections zones, which can blow wet flux c

BGA Baking in Reels?

Electronics Forum | Fri Feb 01 15:09:43 EST 2008 | chef

Don't do it.!!!! Are you nucking futs? Why is pre-bake required? Are you producing in high humidity? Is the package of the device poroues enough to suck in moisture? Think, consider you will not get an even "bake", the outside of the reel will get

BGA Placement Process

Electronics Forum | Fri Mar 26 09:00:19 EDT 2010 | krish_bala

Thank you Graham for the response. The particular BGA that we currently Bake is a Level 3 BGA, which means the BGA will expire in 7 days after removal. We are currently baking the BGAs once a week for the problem described above. These devices are u

Selective Soldering

Electronics Forum | Mon Oct 03 16:02:55 EDT 2011 | artposada

The machine does not have pre-heating feature. I'm soldering a six-up panel...I've tried putting them a an oven and letting them soak for 20 mins or so at a low temp. But by the time I placed the panel in the machine and manually fluxed the top sid


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