PCB design issue: solder connection stress

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Mac_Hudson

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I am looking for a standard that states that a solder connection should not be used as a mechanical connection. I know from experience it should not but I need to prove it to my boss before he decides to allow it.

Over time this connection can weaken and possible break due to stress on the solder joints and can cause us big issues in the future. Any help would be great. Thx.
 

chuckey said:
Surely soldered joints are used to anchor all the components. I think you have to be more specific about your problem.
Frank
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You're right, I apologize. We are connecting a motor with two terminals to a PCB and the only connection between the two are the solder joints on the motor terminal. The motor itself is fairly heavy and produces a fair amount of vibration. It is also oriented perpendicular to the floor. I believe the vibration of the motor along with the weight of it will cause a premature failure due to solder fractures. I suggested either design in two screws to hold the board to the motor or bend the tabs flush with the PCB then solder them. The tabs would then act as the stress point and the solder joint would not, though i think the screws is the better solution.
 

This is an unusual arrangement, how are you ensuring that the motor is at right angles to the PCB. Have you tried just glueing the motor to the PCB with one of the thick silicon rubber glues. I think in any case you need a jig to hold the motor when its soldered to the board.
Frank
 

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