Hi everyone,
I have some questions regarding the validity of welder's certification according to AWS D1.1-2010:
1/ Is there an expiration for the validity of welder's certificate if the welder continuously works with the given process of welding as the WPS in which he was certified?
2/ When it comes to the validity period (normally 6 months), can we prolong the validity forever or is there any requirement for the the times of prolongation?
3/ The welder was qualified and certified by the third-party organization, and the certificate was issued by them, of course. Is it possible to have the welder's certification verified only by the manufacturer (us) without assessment of the third-party organization (Surveyor)? You guys can take a look at the table of prolongation of our welder's certificate as below.
![](http://i.imgur.com/fvFJzgi.jpg)
![](http://i.imgur.com/nZ2L6wB.jpg)
Regards,
Jack.