Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


solder alloy change

Views: 1161

#67944

solder alloy change | 17 January, 2013

hi, we use SACx0307 since 2006 year.now , I want change this alloy with SN100C?I now that we must remuve all solder in the pot and cleen it.But that is very difficult process.What you think, can I just add new SN100C in the solder wave?What is the risk? sorry for my bad English

reply »

#67952

solder alloy change | 18 January, 2013

The risk is that your chemistry will be off.. Don't do it..

reply »

#67958

Answer Depends On ... | 18 January, 2013

You're trying to balance the 'cost' of changing the alloy in your solder pot with risk of running a continually unknown and constantly changing alloy. I can't tell you what's best, because that depend on your situation. Some thoughts on changing the alloy are: * Cleaning a solder pot is dangerous and time consuming. You'll blow a weekend wearing a respirator doing this. * Cleaning a solder pot could be time well spent. You wouldn't be the first one to find serious corrosion problems in the pot while doing a clean-out. Better to find them on your terms rather than by wondering why all of your solder is on the floor later. * It won't be easy to obtain full value for your SAC307. Potential buyers will not believe that your alloy is clean.

Some thoughts on slowly changing the alloy are: * Likely, your thermal recipes for all your products will require constant tweeking, blowing your Cp and throughput. * Customers will not understand why you think running an unknown alloy is a good idea. * Solder suppliers will not provide much help troubleshooting your process after they find-out that you're running an unknown alloy.

reply »

#67959

solder alloy change | 18 January, 2013

if your solder wave machine has a removable solder pot, consider getting a second solder pot. So you will start with a brand new empty solder pot. Keep the current one with your current solder as a backup.

reply »

Large PCB Dispensing System