Fatigue in Weldment

[PhilEduard]

I heard most people saying the welded part is much stronger than the base metal attached until I finally read some actual reports claiming fatigue failure in welded parts. My queston is: Is the weld structure (meaning all portion thereof emanates from welding procedure - not the base steel portion) normally weak or brittle, etc., that makes it susceptible to fatigue failure? Thanks for the tip or enlightenment.

Regards,

Phil

 

[TGS4]

I would recommend checking out WRC Bulletin 474

http://www.forengineers.org/cgi-bin...ion=view;mode=1;page=1;id=483;.cgifields=sort

for a good read on the subject. Typical welds ahve inherent cracks in them, making the calculation of "fatigue life" more one of a fracture mechanics-based crack-growth life.

 

[PhilEduard]

Thanks TGS4. This is very helpful.

Phil