QW404.6(Non-essential variable as per QW253) specifies that,If there is any change in the diameter of the electrode as specified in the WPS.It means if there is no Impact requirement, change in diameter of the electrode is a Non essential variable.So In your case there is no restriction as per the code specification, if there is no Impact requirement .you can use any diameter of the electrode.
If there is a Impact requirement,as per QW253 it shall be refer to QW404.7(Supplementary essential variable) - it restrict to use the electrode diameter not more than 6mm.If the diameter of the electrode greater than 6mm shall need qualification.
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