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Solder Joint Shear (Visual) Condition?

ianchan

#6846

Solder Joint Shear (Visual) Condition? | 13 June, 2001

Hi mates,

I did a recent shear test (destructive test), on a uBGA liken product, and noted the post-shear solder joint, had clean "smooth" visual appearance under the uBGA pad, however the matching pcb pad was clearly lifted clean.

Question: 1) how is solder joint supposed to seperate for a shear test?

1a) visual post-shear appears like two smooth plane-slide (shear)motion break?

1b) visual post-shear appears like "clayball" jagged (shear)break?

Anyone with answers or explainations?

Regards, ianchan / QA 13 june 2001

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#6868

Solder Joint Shear (Visual) Condition? | 13 June, 2001

It depends on if [1] your solder connection is properly wetted or not and [2] the connection was sheared properly or not. For a properly wetted connection and properly run shear process, it looks like someone cut the connection with a knife.

Consider further comments on shearing solder connections here: http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=1628&mc=2

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