Electronics Forum: solder and joint (Page 236 of 389)

Re: High temperature soldering

Electronics Forum | Fri Apr 24 15:21:08 EDT 1998 | Earl Moon

| Looking for anyone who has experience with high temperature soldering. Need to determine why solder joints are failing. Thermocycling of unit is -40C to +140C, 30 minute dwell time, 10 sec. transition time | Your help is appreciated | Ed Holton |

solderability

Electronics Forum | Fri Oct 11 09:28:14 EDT 2002 | davef

Designers love to do BIG copper pours for several reasons: * Maximize heat spreading. * Increase EMI shielding. * Laziness. The poor folk that solder the parts on boards HATE big copper planes near solder pads. During soldering, fat copper traces [

Lite-On side looking LED assembly problems

Electronics Forum | Thu May 29 14:48:45 EDT 2014 | olek

On one of our designs, we use LEDs Lite-On/LTST-S110TB (SMD). PCB footprint was designed according to manufacturer's recommendations. However, our vendor has problems with assembling these parts. Some parts are tilted, other have bad solder joints or

Yield levels

Electronics Forum | Thu Jul 18 09:55:05 EDT 2002 | gdstanton

Mike, When we measure solder inspection yield by dividing the number of defective joints on a CCA by the total number of joints on the PWB. A defective joint is classified only once. That is we don't count multiple defects on the same joint. Our

Re: Corroding Solder Joints

Electronics Forum | Tue Dec 28 15:12:03 EST 1999 | Bill Schreiber

Rick, Ultrasonics is a mechanical scrubbing action (cavitation) similar to any other scrubbing action, if you scrub long enough, you stand the chance of wearing away some of the surface material (shiny coating of a solder joint). The shiny coat on a

Re: Lifted Leads on Fine pitch QFP's

Electronics Forum | Mon Apr 19 14:38:01 EDT 1999 | Chrys Shea

25 PPM)! | | 1. Is there a better process to solder the leads of QFP's with lifted "minute" lifted leads still having a realiable solder joints? | | 2. Or has anybody tried modifying solder pads and use thicker solder paste deposit to compensate fo

Selective Assembly

Electronics Forum | Mon Jun 10 13:31:29 EDT 2013 | emeto

Is there anything on the other side of the board? If not the process will be very standard. 1. SMT - place the small parts on your board. It is called surface mount technology. Basically one machine applies solder paste on the board, another machine

Sn Content in Sn63 Pre-Tin

Electronics Forum | Thu Sep 07 15:20:58 EDT 2023 | rjroaquin6

Hello All, I recently had a case of excessive tin coming from a solder pot sample. The solder is SN63 but the results of testing had a 64.97% for Sn. The J-STD-001 spec is 61.5% to 64.5%. The pot is used to pre-tin wires which will then be solder

where to get good flux

Electronics Forum | Wed Apr 03 04:08:20 EDT 2013 | ericrr

Yes well, now we used to add a bit of flux to our leaded paste to make it slightly runny, But when we went to unleaded paste the joker who came in from another company to set the temperature on the oven said "you dont add anything to unleaded paste!.

25 mil QFP soldering issue

Electronics Forum | Mon Jul 19 19:39:06 EDT 2004 | KEN

I once had a forced convection oven (insert brand here)...and the top 220VAC heater (reflow zone) had shorted to the frame ground, blowing the branch line fuses. THe machine had no idea the heater was out because the lower heater was heating the upp


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