T limit & T qualified

Hi Experts,
Please explain to me that What is difference between T limit & T qualified ? Many Thanks

@Hieu_Thai read in ASME IX
QW-403.6: T-limits (supplementary essential)
QW-403.8: T qualfied (essential)

Sample explaination at Welding procedure specification - GTAW (ASME IX P-Number 10H)

Thank Mr.Bien,
That means is T-limits apply to CVN, T-qualified apply to normal WPS ?

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Yes, T-limits only apply when CVN required.

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any specific in AWS D1.1