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January 9, 2018 - Updated January 24, 2011 - Originally Posted Source of Wave Solder BridgingWe 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?
V. L. |
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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 In his 32 years of industry experience, Mr. Seelig has authored over 30 published articles on topics including lead-free assembly, no-clean technology, and process optimization. Karl holds numerous patents, including four for lead-free solder alloys, and was a key developer of no-clean technology.
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 Scott Cain is the Sales Manager for the premier PCB Tooling Solution company in the industry, InsulFab PCB Tooling. Cain has seen every application and has worked with process engineers to create a solution to increase their yield and decrease the human interaction.
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.
CEO APS Novastar Tim Kardish is a technology business leader with 26+ years experience in the PCB, SMT and AOI assembly equipment industry. Tim is the CEO and a member of the Board of Directors at APS Novastar, LLC. He is a member of IPC and SMTA.
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 Greg York has over thirty two years of service in Electronics industry. York has installed over 600 Lead Free Lines in Europe with Solder and flux systems as well as Technical Support on SMT lines and trouble shooting.
Wave solder bridging can happen for variousreasons. First, the data has to be collected:
Engineering and Operations Management Independent Consultant Georgian Simion is an independent consultant with 20+ years in electronics manufacturing engineering and operations.
Contact me at georgiansimion@yahoo.com. |
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