Numerical aspects for efficient welding computational mechanics

Abstract

The effect of the residual stresses and strains is one of the most important parameter in the structure integrity assessment. A finite element model is constructed in order to simulate the multi passes mismatched submerged arc welding SAW which used in the welded tensile test specimen. Sequentially coupled thermal mechanical analysis is done by using ABAQUS software for calculating the residual stresses and distortion due to welding. In this work, three main issues were studied in order to reduce the time consuming during welding simulation which is the major problem in the computational welding mechanics (CWM). The first issue is dimensionality of the problem. Both two-and three-dimensional models are constructed for the same analysis type, shell element for two dimension simulation shows good performance comparing with brick element. The conventional method to calculate residual stress is by using implicit scheme that because of the welding and cooling time is relatively high. In this work, the author shows that it could use the explicit scheme with the mass scaling technique, and time consuming during the analysis will be reduced very efficiently. By using this new technique, it will be possible to simulate relatively large three dimensional structures.

Analysis of the tool plunge in friction stir welding - comparison of aluminium alloys 2024 T3 and 2024 T351

“…Numerical simulations can be useful for development and optimization of any welding process, e. g. [19][20][21]. Of course, in addition to the simulation of the process itself, numer- ical methods are also applied in determining the fracture behavior of the welded structures, [22].…”

Numerical analysis of thermal stresses in welded joint smade of steels X20 and X22

“…To prove this, the residual stresses were calculated using the finite element method, applying procedure described in [4][5] and software ABAQUS, The paper shows the value of stress if welded joint has not been heat treated. Figure 7 shows the stresses at the outer surface of the weld metal, and Figure 8 stresses at the inner surface in the root pass and HAZ.…”

New method for determining cooling time and preheating temperature in arc welding

“…For convenience of discussion, it is grouped with arc welding. Basic work in this area is studied, researched and presented in [10,11]. According to our experience and from published references [12][13][14][15], a new approach for solving problems of arc welding and the calculation of important parameters has been developed.…”

“…They all define links between critical cooling time t 8/5 , the welding input heat and preheating temperature. The literature [1][2][3][4][5][6][7][8][9][10][11][16][17][18][19]] provides 2-D and 3-D models of analytical dependencies. Hence, there is a known relation given by eq.…”