By changing groove angle and groove geometry, can we expect any differences in residual stresses in a weldment?
Dear Ravikiran,
Groove design changes the filling volume, sequence, number of layers, time to fill etc. Hence, it is expected to change the residual stress as well as distortion of the welded parts. Exact change in residual stress and distortion can be studied on case to case basis.
Regards,
Chandrashekhar
Bevel geometry, depending on the metal base material, sequencing the welding operations, process, and procedures used, can considerably increase the strains of the welded joint. If it is not defined properly, the tensions generated may cause distortions, dimendionais losses, warpages.
Excellent answers. The basic question is why to change bevel geometry? It is defined according to the respective ISO standards or structural codes for plates, pipes etc. The concept behind it, was explained by Mr Eder Alves. Small divergions may be acceptable e.g. in case of plates a range of root opening is usually dictated.
Thank you so much for your answers.
I am measuring residual stresses for two joints. one is a V-groove (~15 degree) and another is U-groove. Both joints were fabricated using GTAW with maintaining similar parameters during welding. So, can I compare the residual stresses for these two joints?
It sounds strange to me. Usually GTAW is used for thin specimens without groove. Tell me the geometry (plate, pipe etc) and its thickness.
In the following link you can take a general idea:http://www.protem.fr/usa/latest-news/70-assembling-pipes-by-butt-welding-the-different-types-of-bevels-and-how-to-make-them
For further details I would suggest you to follow the guidelines of the standards (BS, EN, ISO, ASME etc) depending on the organization your are working for. In general no significant variations are observed among them.
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