Electronics Forum | Mon Feb 28 16:21:41 EST 2005 | lyrtech
Thanks a lot to all of you! I found my problem: It was the pressure of the ultrsonic spray fluxer who was to low. The flux didn't wet all the hole and the solder didn't fill completly the hole. No one in my area knew the solution. Thanks one more ti
Electronics Forum | Thu Mar 03 09:58:59 EST 2005 | Marc
The gears should be wet. This gear box acts like a rear end axle. Not sure of the lubricant but it is like a red transission lube, comes in as complete unit from supplier. You can't get the lube from Speedline since it is sold as a complete unit.
Electronics Forum | Wed Apr 06 15:28:04 EDT 2005 | patrickbruneel
Soldering PTH in reflow makes the process a lot more dependent on the physical forces in soldering (capillary force vs. gravity). Reducing the topheat in your oven will help the capillary forces (opening the hood solved the problem). Heat rises so if
Electronics Forum | Wed Apr 06 21:37:35 EDT 2005 | KEN
Are you saying you have solder balls (as in solder paste balls) at the lead tips (or land tip)? This means your thermal profile is not hot enough. why the sudden cahnge? I will bet the lead frame material was copper and is now alloy 42. sounds like
Electronics Forum | Tue May 10 16:57:42 EDT 2005 | russ
Of course when it gets too thin it becomes difficult to remove! D^%#$'d if you do, D!@#'d if you don't. I agree with Jerry we also run the stuff semi wet when we have to. Do you have the possibility of getting these masked prior to assembly like t
Electronics Forum | Tue May 31 10:44:16 EDT 2005 | Scott B
We have found that when the HASL thickness is less than 5 microns the tin in the HASL reacts with the copper leaving a SnCu surface with poor solderability and microscopic grainy Pb islands. The IPC does not specify minimum HASL thickness but we now
Electronics Forum | Mon Jun 13 09:23:54 EDT 2005 | russ
I agree with Dave on the Water soluble process for this part. It is interesting that I have yet to find a Water Soluble for lead free that works. I have experienced a lot of problems with the flux on these pastes, wetting, solder balls, etc... kind
Electronics Forum | Fri Jul 15 13:16:08 EDT 2005 | Brian
We have seen this problem in the past and had to deal with similar customer constraints. It's not the flux causing the wetting, but the placement and pad geometries as some have mentioned. To reduce or eliminate the problem, we have changed the ape
Electronics Forum | Thu Aug 25 11:45:42 EDT 2005 | slthomas
I would attack the simplest possibility first. Make SURE you have enough solder paste going on the pads. If you don't, not only will you not have enough solder to make a good fillet, but you might not have enough flux available to allow what little s
Electronics Forum | Tue Aug 23 11:06:05 EDT 2005 | molosse21
Hi, We started to get more and more parts RoHS compliant on our smt line. The operator is sending me back a reel of componenent (0805)resistors and he is telling me that solder wetting is poor and unnaceptable due to oxydation deposit over the leads
