The x-ray is a tool to highlight anomalies/issue/concerns with PTH vertical solder fill, 50% for Powers and 75% for signals.   That need to be flowed with cross section to verify solder wettability to the copper wall.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Monday, March 18, 2013 10:54 AM
To: [log in to unmask]
Subject: [TN] x-ray inspection of PTH barrel fill

Greetings all,

I would like to ask the group for an opinion on the following question:

Is it appropriate reject a through-hole solder joint as a defect under IPC-A-610E section 7.3.5.1 (barrel fill < 75%) based on x-ray inspection?

The reason for using x-ray is that the component is in the way and preventing visual inspection of the destination side.

I know that 610 is a visual standard. I see that Section 8.3.12 specifically states that x-ray can be used to identify defects in the special case of BGAs. I find no such statement anywhere in section 7. And the standard is quite specific in calling out exactly what magnification and even lighting should be used for inspection. This leads me to believe that x-ray should NOT be used to identify through-hole defects.

Am I reading too much into this? Your thoughts would be appreciated.

Best regards,
Raye Rivera

QA Manager * Canoga Perkins
20600 Prairie Street * Chatsworth * CA 91311-6008
818-678-3872  * [log in to unmask]


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