Electronics Forum: shiny copper aoi (Page 1 of 4)

copper land delamination

Electronics Forum | Mon Nov 15 14:40:38 EST 1999 | Bob Smith

Hi, I have a problem I've never seen before so I hope someone here can help. A recent batch of PCBs arrived where the copper lands delaminate with a small pull. Normally you have to pull pretty hard and the whole land comes off the substrate. These

Lead free tin copper only

Electronics Forum | Fri Feb 03 17:47:06 EST 2006 | Brian Smith

Kester offers Tin-Copper AND Tin-Copper-Nickel. The Kester K100 alloy is a Tin-Copper-Nickel material that is very similar to SN100C. Straight Tin-Copper isn't tremendously popular but can be used in low-cost, consumer-electronics applications wher

Cleaning Copper Surface

Electronics Forum | Tue Jan 26 09:33:24 EST 2010 | smt_guy

Hi, I have a copper plate that we received from supplier with oils and some sort of stains. We tried most of the general type of degreasers by soaking but didn't work until we tried a Floor Stripper from Ace and it does make the copper clean and shi

Cleaning Copper Surface

Electronics Forum | Tue Jan 26 12:18:38 EST 2010 | smt_guy

what made us to try it? after testing most general degreases including some electronic degreasers in spray can from reputable manufacturers without having success in achieving a clean and shiny (no stain) surface. we do not want to re-etch or use et

Re: solder mask wrinkles

Electronics Forum | Tue Oct 19 19:25:40 EDT 1999 | Jeff Sanchez

Carol, I think the guys are right about you stand off problem but I want to address the wrinkleing of your masking. Although I think the temps you are subjecting the board to are very high and more than likely creating problems of their own. I th

Re: Fiducial Capture MV2F & CP4-3

Electronics Forum | Sat Aug 22 10:25:11 EDT 1998 | Ben Salisbury

| We are using PCBs of CEM3 Material with bare copper fiducials. The whole | board is of bare copper with a lacquer coating (Coats brother S2974). | The fiducials are of 1 mm diameter bare copper. we use Panasert MV2F as | well as Fuji CP4-3. In bo

Sn100C - anyone use this at Reflow?

Electronics Forum | Wed Mar 18 16:50:20 EDT 2009 | khowell

There are many users of SN100C in reflow. SN100C was originally introduced as a wave solder alloy which offered cost savings over SAC, no solder pot erosion, and high fluidity. Since it is eutectic, no plastic range, the joints have a smooth, shiny

Micro crack for lead free wave solder

Electronics Forum | Wed Aug 10 09:01:15 EDT 2005 | fctassembly

Hello Joseph, Sorry for the bad news but microcracking is a well known potential condition occuring with the SAC305 alloy. Microcracking is a condition being seen with many joints soldered with the SAC305 alloy. It is technically a shrinkage cavity

Using an AOI for TH solder checks

Electronics Forum | Wed Aug 07 15:41:28 EDT 2013 | simplycomplex85

Absence of solder is just black/super dark red which still falls under any percent I could put in there. So it passes. Maybe I'm a bit confused on how the machine checks solder in general anyway... 0%-60% is a pass by default. Thats anything dark - s

Re: Fiducials

Electronics Forum | Fri Feb 19 09:20:01 EST 1999 | Stefan Witte

If the fiducials are rejected from the vision system, I would not relay on the accuracy of the position. Again, I would like to point out that the circle shape has a somewhat sinoid contrast in X- and Y- direction ( same as a diamond shape, but recta

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