|Ask the Experts|
January 9, 2018
Source of Wave Solder Bridging
We are having continual lead bridging problems with our wave soldering system. How would you rank the following as the most likely and least likely causes, and areas to investigate?
|Expert Panel Responses|
In wave soldering, any termination that will wet to the solder while being submerged has the ability to bridge. It's more a function of the lead size and spacing that causes the actual bridge. The closer they get the more bridging can occur. Bridging of terminations can occur on any component that is submerged in the solder bath during the wave soldering process. Components with tight spacing are most prone to bridging. This is especially true of connectors and leads which are not trimmed short enough or are clinched toward each other leaving little room for drainage when emerging from the main wave bath. Areas to check, by order of importance, when attempting to eliminate this defect are as follows:
Deck Street Consultants
After investigating the variables you listed if you are still having bridging problems it would be adventageous to discuss this issue with your wave pallet supplier. Copper solder thieves are a cost effective solution that will reduce or eliminate the bridging of components during the wave solder process. If you have any questions or would like further information please feel free to let me know.
Global PCB Sales Manager
InsulFab PCB Tooling
Bridging during a wave soldering process can be attributed to a combination of factors. Since consistent and effective thru-hole component wave soldering is best addressed through the introduction of a clean surface area to be soldered with a stable angle of attack with contaminate-free solder at an ideal temperature profile consider the following rank of most likely causes.
We really need to know if this is Lead Free or Leaded Wave Soldering as they do process differently. ONE of the most important factors that manufacturers are getting wrong is the conveyor angle with Lead Free soldering. Please check your angle first as this should be kept exactly the same as Leaded at 7 degrees. The peel off should be as near to the middle of the wave as well so the solder is peeling off both directions for maximum drainage. If you could advise if Leaded or Lead Free and if possible some post some pictures of the bridging would be excellent
Technical Sales Manager
BLT Circuit Services Ltd
Wave solder bridging can happen for variousreasons. First, the data has to be collected:
Engineering and Operations Management
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