Hi, 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. Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Thu, 8/19/10, Srinivas Engr <srinivas.gmsrini@gmail.com> wrote:
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