Please refer to QW-401.3 for definition of supplementary essential variables (A change in a welding condition which will affect the notch toughness properties of a weldment).
QW-403.8 is an essential variable,it governs the minimum and maximum thickness qualified of the basemetal.
QW-403.6 is an Supplementary essential variable.Please note that,If QW-403.6 applies, it modifies the minimum thickness qualified not the maximum.
So if you want to change the welding condition which will affect the notch toughness properties of the weldment only,QW-403.6 applies.otherwise follow essential variable QW-403.8.
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