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In Solder Rework/Repair, Solder Training and Tools

April 2010 Vol. 2, Iss. 30

 

Dear Subscriber:
In this newsletter we discuss the copper dissolution problem found in PTH rework.

APEX was a mixed bag this year. While the show floor traffic was again light and the space taken up by exhibitors seemed to shrink again, there were several returning exhibitors who sat out last year. There were more customers in a buying mood attending the show. In terms of conferences and technical sessions the programming was of a high caliber and even the Friday afternoon sessions were well-attended.The IPCA-610 and the JSTD-001 new revision are now available for sale.BEST will be scheduling information sessions highlighting the new features of the the inspection criteria. Stay tuned.

Next week BEST will be presenting a Lead Free Reowrk tutorial as part of the Wisconsiin SMTA meeting. This will be both a chalk talk as a hands-on demonstration session. Bring your problem boards to the session. for more information on the April 23rd session contact Bill Kapen at Rockwell Automation at This email address is being protected from spambots. You need JavaScript enabled to view it..

Regards

Bob Wettermann
President, BEST Inc
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Copper Dissolution and Rework

The high tin content in SAC lead free solder alloys has caused problems in PTH rework.

At elevated temperatures associated with SAC alloys solder fountains the dissolution rate of the high tin content solder system causes the walls of the PTH as well as the copper pads to dissolve.

Even with adequate preheating of the board which will reduce the dwell time in the solder fountain, the dissolution, especially around the "knee" of the PTH, gets thinned out to a point where the reliability of the connection is extremely compromised.

These problems can be mitigated by :

Using a different alloy for rework with dissolution rates lower tha that of the SAC alloy

Using a a heating system such as hot gas rework or IR or laser rework heating sources

Contact BEST to see if we can help you solve this problem...... Call Laura Ripoli at (847) 797-9250 to see if we can help.

 
BEST to Obtain ITAR Registration
ISO 9001 2008

After we became  ISO 9001:2008.registered several customers have asked us to become ITAR registered.

We are undertaking this effort and expect to have the registration and incorporation into our Quality Management System by the end of the summer. We will keep you updated.

Let us build some sub-assemblies for you where ISO registration is a requirement.

Call Laura Ripoli at (847) 797-9250 for your requirements.

 
       There are other good tablet PCs?
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Now that IPAD has garnered all of the PR the question is should you buy this if you are an early adopter. There are numerous shortfalls including lack of support for flash, no external memory support and problems supporting WiFi connections.

HP's Slate tablet - which lacks a name for now - will have an 8.9-inch display with a resolution of 1024 x 600, and will be a capacitive touchscreen with multi-touch support. The model will supposedly run Microsoft Windows 7 Home. It will also include a premium. SD card reader providing additional storage, and supporting SDHC and SDXC, potentially adding 128 GB of capacity.

The Lenovo X200 is a solid ThinkPad. It has the same plain black signature design and a solid keyboard and display. The ThinkPad X200 features an Intel Core 2 Duo processor, Windows Vista Business, 12.1" WideView Standard WXGA display and a 80GB hard drive. It's a business focused tablet and great for note-taking.

The Asus Eee PC T91is an ultraportable 8.9 inch tablet featuring an Intel Atom processor, TV Tuner, integrated GPS, and up to 16GB SSD hybrid storage.

 
TABLE OF CONTENTS
 
Copper Dissolution and Rework
BEST ITAR Registration Process in the Works
Tablet PCs
 
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Laser Services
StencilMate(TM) Leadless Device Rework Stencils
Repair and Testing Services
 
 
BUY your copy the the NEWLY RELEASED Versions of IPCA-610 or JSTD-001 REV E
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Order either a copy of the IPCA-610E including updated criteria with respect to wire and terminals, bottom-terminated devices or the new JSTD-001 REV E.
 
Schedule the New BEST Mobile Training Center
 
Featuring a richer training experience as students are "sequestered" inside of a training environment, all of the training tools and materials come to you and the BEST professional, practical instruction. Call Katy Radcliff (847) 797-9250 to schedule.
 
Free Evaluation Kit of Leadless Device Rework Stencil
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If you want to simplify the rework of your leadless devices then try out the BEST StencilMate(TM) here.
 
VOCAB- Word of the Month
Vocab

chicanery

"shi-KAY-nuh-ree" which is a noun;

The vocabulary you use tells others your level of intellect.

Definitions: Deception by trickery or sophistry.

Usage: "Some analysts are claiming that these arrests [of Taliban members] are not good news at all, but merely evidence of still more too-clever-by-half chicanery by Pakistan's Inter-Services Intelligence"
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Newsletter

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