Wyniki wyszukiwania - BazTech

1

Finite element investigation of IGSCC-prone zone in AISI 304L multipass groove welds

Taraphdar P. K., Pandey C., Mahapatra M. M.

Archives of Civil and Mechanical Engineering

|

2020

|

Vol. 20, no. 2

353--365

EN

AISI 304L stainless steel is most commonly used for spent nuclear fuel management; however, the welded joints of this steel are susceptible to intergranular stress corrosion cracking (IGSCC) under the influence of low-temperature sensitization. In the present research, the temperature history of two different groove designs (conventional and narrow groove) has been analyzed to ascertain the propensity of the weld zone to intergranular corrosion (IGC). 3D finite element models (FEMs) have been developed to retrieve the nodal thermal history and predict the region susceptible to IGSCC. The FEM results predicted a lower duration of exposure to the IGC temperature range for narrow groove design as compared to conventional design. The lower duration of exposure exhibits a lower propensity to chromium carbide precipitation and the tendency to IGSCC. The FEM analysis also has been used to observe the difference in the size of the region susceptible to IGSCC in the heat-affected zone of the respective weld designs. The predicted results obtained from the numerical analysis were validated by comparing the chromium carbide precipitation for both the groove designs.

2

Evaluation of fillet weld properties and fatigue behaviour in dependence of welding parameters

Leitner M., Foosl T., Stoschka M., Eichlseder W.

Archives of Civil and Mechanical Engineering

|

2011

|

Vol. 11, no 3

651-660

EN

Numerous different design codes can be used to describe the durability of welded structures. One wide spread approach is the local notch stress approach, which calculates the fatigue lifetime in dependency of the notch stress factor using different effective radii. To calculate the fatigue behaviour by using the local notch stress approach, the R1MS-concept is commonly used [1]. The evaluation of the influence due to the welding process parameters, especially for high-strength steels, the effect of both the geometrical and metallurgical notch is studied in a parametric way for selected weld joints. Experimental fatigue tests have been performed to investigate the link between fatigue life and manufacturing process dependent weld toe notch design. To be able to capture the influence of welding parameters, as energy input per unit length, welding velocity, angle of blowpipe, size and shape of the heat input zone in a numerical way, a local coupled thermo-mechanical simulation is build-up. The complexity of this modelling increases very strong by the temperature dependency of the multitudinous phase material properties. The material and manufacturing properties were adjusted by comparison of the temperature profiles. This experimental based procedure defines the simulation base for more complex welding seams.

PL

Obecnie stosowane są liczne metody do określenia trwałości struktur spawanych. Jedną z nich jest metoda naprężeń karbu, która pozwala obliczyć trwałość zmęczeniową spoin. W pracy zostały przedstawione eksperymenty zmęczeniowe, na podstawie których określono zależności pomiędzy trwałością spoiny a parametrami procesu jej wytwarzania.

3

Numerical simulation of temperature fields in Sysweld simulation programme

Konar R., Mician M., Strasko J.

International Journal of Applied Mechanics and Engineering

|

2010

|

Vol. 15, no 2

423-431

EN

The theoretical part of the paper deals with basic information about FEM simulation, simulation of temperature fields and temperature cycles in welding. A simulation programme Sysweld was used for welding simulation. The experimental part includes a simple simulation of temperature fields and cycles in five-pass butt welding joint. Results of the simulation are illustrated by means of temperature fields and temperature cycles.