NDT requirement for dimpled skin... 1

[MQI067]

Hi guys, I am currently replacing a C-130 side skin panel made of 2024-T3 0.050. It has to be dimpled for MS20426AD5's and NAS 517-3's. The hot dimpler we're using isn't exactly flash, the upper die heater doesn't work, resulting in dodgy dimples.

Should I get NDT to check these dimples?

Thanks.

 

[der8110]

Absolutely, eddy current as a minimum and probably one more method. Then realize NDT has a threshold detectable flaw size, that alone should be reason for starting over. But if the part is off the plane, there should be good access. Could also make specimens processed in the same way, in a convenient size, and NDT those in the lab.

And get the dimpling machine fixed (!), assuming there are no cracks and the skin panel is otherwise salvagable. Does not sound like it is going to work out. If I were to guess, there is someone trying to 'push'. You do not want to dink around with something so fundamental, and critical, as a dimpled rivet joint.

 

[MQI067]

Thanks der8110, that was very helpful, I am shitcanning the skin, will have another one made and a sample tested, i'll push for the dimpler repair too.

Have a good one!