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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Crack solder joint. Whats the cause?

Charlie

#3046

Crack solder joint. Whats the cause? | 13 September, 2000

Hello, Can you tell me the prime cause of cracked solder joint on a surface mount part? Charlie,

reply »

#3047

Re: Crack solder joint. Whats the cause? | 13 September, 2000

Hi Charly,

short question, short answer: excessive mechanical influence often in combination with bad solderjoint itself. For bad solderjoints there are many many reasons, process and material related. Are there any special circumstances that made you ask, what are your problems?

Wolfgang

reply »

#3048

Re: Crack solder joint. Whats the cause? | 13 September, 2000

Charlie: I'm with Wolfgang ...

The prime cause of your cracked solder joint on a surface mount part is mechanical stress.

That�s about as specific as you�re gonna get. More information would be helpful. For instance: * Talk about the distribution of the problem, including a single lot or from various lots and over components and component types on the board * Tell us about the board (ie, thickness, type, solder mask, pads coating, pad size, etc) * Describe the component(s) (ie, type, termination finish, etc) * Take us through your process steps that proceed the problem, including the reflow profile and its control * Help us with the solder and the flux you are using * Discuss the crack (ie, 45� from component pad to center of fillet, er what?)

reply »

 Reflow System

SMT Replacement Nozzles