Heller Industries Inc. | https://hellerindustries.com/solder-balls-defects/
. Their formation is promoted by excessive oxides in the solder paste that inhibit solder coalescence during reflow. Solder ball defects are probably the most common reflow solder defect, and there are many causes of solder ball defects beyond the system that will contribute to their formation
Heller Industries Inc. | https://hellerindustries.com/solder-balls-defects
. Their formation is promoted by excessive oxides in the solder paste that inhibit solder coalescence during reflow. Solder ball defects are probably the most common reflow solder defect, and there are many causes of solder ball defects beyond the system that will contribute to their formation
Heller Industries Inc. | https://hellerindustries.com/delamination/
. (Some practitioners pre-bake components and boards to drive out moisture. This is not encouraged and should be a last resort as baking tends to build intermetallics as well as degrade the solderability by increasing oxidation levels
| https://www.eptac.com/wp-content/uploads/2013/01/eptac_01_23_13.pdf
Surface Mount Technology Association (SMTA) | https://www.smta.org/msd/msd.cfm
(MSL and body thickness). To avoid degrading solderability there is a cumulative limit of 48 hours at 125C. 8. The floor life clock is not reset by reflow. Assemblers must track the remaining floor life of MSDs assembled on boards for double-side reflow
| https://www.eptac.com/wp-content/uploads/2021/11/webinar_eptac_01_16_08.pdf
| https://www.eptac.com/soldertips/solder-paste-shelf-life-and-testing/
. The adverse affect would be un-reflowed solder paste, insufficient reflow, solder balls, dewetting, etc. The recommendations would be to perform a solderability test, slump test and flux activity test on the solder paste itself and see if it still performs to the original standards of the material
| https://www.eptac.com/faqs/ask-helena-leo/ask/vapor-phase-soldering-to-immersion-tin-plated-pads
: This is a very interesting question regarding the reflow of immersion tin plating. I’ve found and attached this web site that discusses this particular issue. http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4684411&url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber
| https://www.eptac.com/ask/vapor-phase-soldering-to-immersion-tin-plated-pads/
: This is a very interesting question regarding the reflow of immersion tin plating. I’ve found and attached this web site that discusses this particular issue. http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4684411&url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber
| https://www.eptac.com/wp-content/uploads/2021/11/webinar_eptac_05_20_09.pdf
both guidelines and standards in the areas of: Joining techniques and soldering requirements Solderability Testing/Soldering Materials Opto-Electronic Assembly What is the 5-20 A&J Committee
