Electronics Forum | Fri Jan 12 12:38:57 EST 2007 | maddog
Do you have any pointers concerning the oven setup and profile if you are soldering a module with bottom connections and gold pads to a pwb with an OSB finish? The solder paste is SnPb, no-clean. The paste mfgr. recommended profile produces voiding
Electronics Forum | Thu Apr 03 17:50:53 EDT 2014 | rboguski
We use it almost exclusively in manual mode for PCBA failure analysis. Our main purpose is to find head-in-pillow defects; secondarily incomplete wetting of ball to substrate. In two years of almost continuous use we have only had occasion to use t
Industry News | 2021-01-30 07:05:46.0
Most wave soldering systems installed in electronic productions are equipped with one or two solder nozzles that generate a turbulent wave. This configuration is ideal for most products; however, this concept reaches its limitations if, for example, PCBs in masks are to be processed. The reliable wetting of all solder jointsis not guaranteed, depending on the thickness of the mask and the size of the cutouts. Additionally, it might be challenging to achieve a reproducible process if the distances between covered SMD components and the THT pins to be soldered are too small. Sophisticated assemblies that are processed in soldering masks often show soldering defects such as incomplete solder joints or solder bridges.
Industry News | 2017-01-18 05:21:35.0
This photo CD ROM provides the process or quality engineer with a source of PIHR photographs of the assembly process, components and process defects which may be used in company inspection document or training presentations. They may be simply pasted into any document for in house company use. Now over 250 photographs are provided in either jpg or tif file format for use in PowerPoint, Word inspection standards or online publications royalty free http://www.bobwillis.co.uk/product-category/photo-cd-rom/
Technical Library | 2013-12-27 10:39:21.0
The head-in-pillow defect has become a relatively common failure mode in the industry since the implementation of Pb-free technologies, generating much concern. A head-in-pillow defect is the incomplete wetting of the entire solder joint of a Ball-Grid Array (BGA), Chip-Scale Package (CSP), or even a Package-On-Package (PoP) and is characterized as a process anomaly, where the solder paste and BGA ball both reflow but do not coalesce. When looking at a cross-section, it actually looks like a head has pressed into a soft pillow. There are two main sources of head-in-pillow defects: poor wetting and PWB or package warpage. Poor wetting can result from a variety of sources, such as solder ball oxidation, an inappropriate thermal reflow profile or poor fluxing action. This paper addresses the three sources or contributing issues (supply, process & material) of the head-in-pillow defects. It will thoroughly review these three issues and how they relate to result in head-in pillow defects. In addition, a head-in-pillow elimination plan will be presented with real life examples will be to illustrate these head-in-pillow solutions.
Heller Industries Inc. | https://hellerindustries.com/causes-defects-reflow-soldering/
Component Contamination Board Contamination Pad Size Mismatch Cause Open Joint DEFECT Tombstoning Voids Solder Wicking Non-Wetting Incomplete Fillets Poor Strength Solder Shorts Solder Balls
