Fatigue of welded joints by effective notch stress

[Foamer]

Dear members,
I am evaluating fatigue life of welded joint of sheet metal (t=1.5-2mm), and I refer to the IIW Recommendation for fatigue assessment of welded structures by notch stress analysis, IIW-2006-09, where it states that when Von Mises stress is used, a corresponding smaller FAT class applies, and a reduction by at least one fatigue class is recommended.
So what is the FAT class below FAT630? Is there an overview of all fatigue classes? Is there a general rule/relation among these FAT classes?
Thanks.

Best regards,
William

 

[TomLee777]

Look up Tab. {3.2}-1: Fatigue resistance values for structural details in steel and aluminium assessed on the basis of nominal stresses. The FAT classes below FAT63 are FAT56 and FAT50, etc. I believed that you had a typo FAT630.

 

[Foamer]

Hi Tom,

Thanks for your response. However,it was not an typo. It is the FAT630, stress range of 630MPa at 2 million cycles, which is used for evaluation by notch stress method.