Electronics Forum | Mon Jul 03 05:39:05 EDT 2006 | ronalds
Hi, I am experience problems while testing wave soldering SMT components that are glued on the solderside (lead free). Between de leads of SOx type IC's and SOT's develop a great deal of solder beads. I have been using a RSS temp.profile while spr
Electronics Forum | Wed Jul 05 13:30:37 EDT 2006 | Chris Griffin
Likely causes of this are: -Preheat temp. too low -too much dross -uncured epoxy -PCB contamination ...also varify the solder flow over the wave is smooth.
Electronics Forum | Thu Jul 06 04:41:58 EDT 2006 | Rob
MF300S is quite an old flux, & a lot has happened since then on the flow solder front - are you sure it's designed for Lead free, or is it just a traditional flux that SHOULD work OK with Lead free?
Electronics Forum | Wed Jul 05 10:13:02 EDT 2006 | jdengler
Is the flux rated for lead free? These higher temps will cause most lead rated fluxes to burn off prior to the wave. Jerry
Electronics Forum | Thu Jul 06 12:26:55 EDT 2006 | Chunks
Sounds like your flux to me. Since you cannot change the board or the machine, changing flux would be one question mark you could take away with a phone call and a sample. You will really be surprised how different fluxes can affect your final prod
Electronics Forum | Mon Jul 10 07:46:51 EDT 2006 | ronalds
You are right, RSS profile is not the correct description. I am using a profile which heats up quickly to let the flux spread. Next linear up to activate the flux and prevent thermoshock. My experience is however, that small changes in this profile
Electronics Forum | Mon Jul 10 09:25:47 EDT 2006 | nodlac
Here is a nugget from the Data Sheet... Wave Soldering: Excess moisture on the PCB during soldering may lead to random solder balling and poor wetting of some solder joints. IT IS IMPORTANT that the flux solvent carrier (water) is fully evaporated a
Electronics Forum | Thu Jul 06 12:52:35 EDT 2006 | samir
..and he can put the flux in and keep it a secret too from his customer.. RSS profile on wave?? I never heard of a soak zone for wave preheat...you may be burning off your activator..hence, the beads. For wave preheat, your main goal is to ramp up
Electronics Forum | Thu Jul 06 03:03:56 EDT 2006 | ronalds
Thank you all for your input. The MF300S Multicore flux is rated for lead free. There is not much dross or contamination. We are using nitrogen. I've tested the boards with the curing test of IPC-TM-650. I think you're all right about the preheat.
Electronics Forum | Wed Nov 29 14:49:38 EST 2006 | MS
Any recommendation to reduce solder beads next to 0402, 0603 and 0805 caps and res? What about home plate vs. bow tie stencil aperture design?
