kunjhon,
I have already answered your question on another post.
You really need to read the code and learn.
If English is not your first language you need to tell us when you ask your questions.
I will be much more willing to help someone who doesn't understand the code due to the English rather than someone too lazy to look for themselves,
QW-322.1 Expiration. The qualification of a welder
or welding operator for a process remains valid provided
no more than 6 months have passed since the welder or
welding operator last used that process.
If your welder has used both processes then both welder qualifications are extended for 6 months
Cheers,
Shane