Bending Stress in Circular weld

[apetr26542]

Welding of a circular pipe to a flat plate where the pipe is in pure bending. I've seen the weld stress calculated as

M/Sw

M=moment

Sw=circular property of the weld

Is this the Section properties of that of a circular ring, with the effective throat being the thickness of the ring?

 

[csd72]

Treat it as a section with wall thickness =1.

This gives you weld load per in (or mm)

 

[Lion06]

or look in Blodgett's Design of Welded Structures. It will give you Sx in in^2 (which is what CSD is talking about by using the thickness of 1). Then when you use M/Sw, you will get K/in to compare to your weld.

 

[desertfox]

Hi apetr26542

stress = M/(Zw * w)

w = leg size of weld

M= moment

Zw= section modulus of weld treated
as a line= 3.142*d^2/(4)

where d = tube dia

regards

desertfox