Electronics Forum | Wed Jan 30 08:30:33 EST 2002 | seto
Hello Dave, Mechanically the conection between the component pad and PCB pad is good (the solder joint is very strong). The problem is associated with poor contact after the use by the customer (vibration, temperature, etc). You can see the pictures
Electronics Forum | Wed Jan 30 17:47:22 EST 2002 | davef
Oooo, pix, coo!!! Yes, that solder connection has been beat-up. It is very �old�. So, your customer is seeing failures, correct? I can believe it. I want to say the solder in your connections doesn�t stand a chance, but lack experience in this a
Electronics Forum | Wed May 28 14:35:47 EDT 2003 | davef
Wow, you're very correct. I guess we use silicone to calibrate our machine, as follows: XPS spectral measurements of dimethyl silicone should include O(2s) at 25 eV, Si(2p) at 102 eV, Si(2s) at 153 eV, C(1s) at 285 eV, and O(1s) at 533 eV. The C(1s
Electronics Forum | Tue Jan 29 20:13:30 EST 2002 | davef
Over-time lead separates from the tin in solder by force of nature [diffusion], but I assume that is not what you are talking about. Please help us understand your question better. Are you saying that the solder does not attach properly to the comp
Electronics Forum | Wed Jul 03 15:40:17 EDT 2013 | davef
Shear tests are [in my opinion] senseless. The shear stress you measure depends more on the shear rate and on the point where the force is applied than on the grain structure. When shearing a component, you not only apply shear stress, but also roll
Electronics Forum | Tue May 27 12:40:50 EDT 2003 | davef
Hi Bill You said, "silicon". We assume by your discussion that you ment to say, "silicone". For background on silicone and soldering, check with Dow Corning [517-496-6000]. They make a OS2 [VOC-free] silicone stripper and should be able to give y
Electronics Forum | Mon Feb 02 22:01:24 EST 2004 | Dean
I find this disturbing when customers dictate your process and equipment? Your responsibility is to deliver a quality product on time. Why would your customer care HOW you achieve this? Hence the success of Chinese manufacturing. I have one custo
Electronics Forum | Mon Jul 14 22:40:45 EDT 2008 | edmaya33
hello Dave, thanks for the references. i will try to compare the results in 3 months interval.
Electronics Forum | Mon Jul 14 07:49:50 EDT 2008 | edmaya33
Do we really need to follow the IPC J-STD-001 Solder purity? If so, how to effectively balance the chemistry of Sn63/Pb37 other than adding a pure tin on the solder bath? Is this really needed to monitor in monthly basis?How many kgs of pure tin pe
Electronics Forum | Mon Jul 14 09:41:35 EDT 2008 | davef
Q1. Do we really need to follow the IPC J-STD-001 Solder purity? A1. Yes, you should control impurities in solder. Further information: * "Allowable concentration of contaminating elements in solder: impurities are harmless unless their level goes to
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