Crack Observed during final assembly of socket

[aansssa]

hi.all of u..
i have get one customer comlain regarding crack observed during assembly of socket.he told to us its raw material crack .
can u told me that how to identified crack by eyes that it is raw material crack ,heat treatment or forging.
can u tell me how to look like all forging ,heat treatment and raw material crack.
he told me its straight and its raw material crack.
many time we observed crack after raw material upsetting test but under deviation we takes in production.
material EN 8D and normalised and raw material supplier write in mill tc 100% ultrasonic test.
and customer observed deep staight crack.

 

[aansssa]

can u tell me how to close this complain i m not under standing how to write in action plan and what we send to customer to close complain

 

[weldstan]

The cracked socket fitting should be examined by a competent metallurgist/materials engineer to determine the nature/cause of the crack.

 

[tbuelna]

If your material supplier provided certs showing the stock was 100% ultrasonic inspected, then you can assume the crack was produced during forging, machining or subsequent heat treatment. You should not have delivered a product to a customer that had a defect, especially if there was a documented history of similar problems with this product. If you need to write a corrective action for addressing the NCR of these parts, it should include all the changes to your production process required to ensure the problem will not re-occur. This would include additional in-process inspections to ensure there are no flaws in the part after forging and after HT.