Residual stress at weld seam

[Jeff]

Hi, I was wondering if welding would wash out pre-existing residual stresses due to plastic deformation etc at and around the weld seam? I.e. the residual stress at the weld would only be due to the weld itself.
Thank you for your time

[Robert]

Yes. basically after welding you will have completly new stresses from the welding. Next to the welds you can expect the stress to be changed as a result of the stress in the weld, so in the parent material the inital stress will play a role in the what stress you get after welding. In general if your not sure you should measure the residual stresses due to welding.

[james1]

HI,


Residual stress is the one type of the depression,which exists in an elastic solid body in the absence of, or in addition to, the stresses caused by an external load. Such stresses can arise from deformation during cold working such as cold drawing or stamping, in welding from weld metal shrinkage, and in changes in volume due to thermal expansion.


Thank you....

[Isaza]

Hi,
I have a question, I´m doing a thesis in which i´m measuring residual stress on a welded AISI 1018 steel using SMAW method, the weld was made with five different amperages, 80,90,100,110 and 120 A. the electrode is an E6013.

I´m getting the following results;

From 80 A to 90 A the residual stress drops (from 127MPa to 103 MPa), from 90 A to 100 A the residual stress grows (from 103 MPa to 219 MPa) and from 100 A to 120 A the RS drops again (from 219 MPa to 45 MPa).

I found similar results on the internet but it was just the graphic with no explanation.

Since the only variable I´m changing is the Amperage, I think the difference has to do with the heat input change, and that the different temperatures cause different phase changes in the metal.

I would appreciate any help.
Thank you.