When Icicles Cool Yields Print E-mail
User Rating: / 0
Written by Paul Lotosky   
Sunday, 01 November 2009 00:00

Resolving unwanted solder protrusions.

An icicle or flag (also known as a horn) is defined as an undesirable protrusion of solder from a solidified solder joint or coating.

Primary process setup areas to check:
Conveyor speed too slow.
Time over preheat too long, causing the flux to burn off.
Dwell time too long, causing the flux to be destroyed before exiting the wave.
Solder temperature too low.
Not enough flux.
Nitrogen use will help prevent icicles.

Other things to look for in the process:
Solder temperature too low.    
Preheat too high.    
Excess flux blow-off.
Solder wave height low.    
Preheat too low.    
Insufficient flux blow-off.
Solder wave uneven.    
Contaminated flux.
Board pallet too hot.
Solder contaminated.    
Flux SP GR too low.    
Conveyor speed high.
Flux not making contact.    
Flux applied unevenly.    
Conveyor vibration.
Board not seated properly.

Other things to look for with the assembly:
Board contamination.    
Component lead length too long.
Component contamination.

Things to look for with the bare board:

Things to look for with the board design:
Poor pallet design.    
Internal ground plane.    
Large ground plane on solder side. 


Paul Lotosky is global director - customer technical support at Cookson Electronics (cooksonelectronics.com) This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Last Updated on Wednesday, 18 November 2009 18:29


Eastern-US: China’s New Competitor?

Parity emerges among EMS Factories from Asia, Mexico and the US.

For the first time in years we see parity in the Eastern US among EMS factories from Asia, Mexico and the US. This EMS market condition will permit American OEMs (the EMS industry refers to OEMs as customers) to have more EMS pathways to choose from. Now more than ever, such EMS assignments will require deeper investigation relating to the OEMs’ evaluation of manufacturing strategies.

The Human Touch

For those who count on the electronics industry for big feats, it’s been a remarkable couple of years.



Advances in Concentration Monitoring and Closed-Loop Control

Contaminated bath water skews refractive index results. New technology can accurately measure aqueous cleaning agent concentration.

Circuits Disassembly: Materials Characterization and Failure Analysis

A systematic approach to nonconventional methods of encapsulant removal.





CB Login



English French German Italian Portuguese Russian Spanish


Panasonic Debuts PanaCIM Maintenance with Augmented Reality
PanaCIM Maintenance with Augmented Reality software provides instant communication and information to factory technicians -- when and where it is needed -- so they can respond to factory needs more...