Abstract
A numerical and experimental study of welding temperature distribution and residual stresses in thick welded plates of SA738Gr.B was conducted. Within the framework of numerical investigations, the temperature field of SA738 thick plate welding was simulated and analysed by using 2-D modelling technology. The temperature field was checked by using the thermal cycle curve with the aim of increasing the computational accuracy and efficiency, and the temperature field was verified by using the thermal cycle curve and heat affected zone. The welding stress field was analysed based on the temperature field, and the indentation test method was used to verify the stress field, and the error was controlled to within 12.5%. With the help of a welding model established for SA738Gr.B thick-plate welding the sequence was simulated. Seen from welding sequence 1 to welding sequence 3, transverse stress S11 changed significantly, decreasing by 14% and 17% respectively, adjusting the welding sequence can reduce welding residual stresses.
Highlights
Thick plates are widely used in nuclear power plants, ships, large bridges, etc. [1,2]
Based on different welding sequences in the curves of stress distribution in the thickness direction, comparison chart analysis can be found that compared with WS1, WSs 2 and 3 can significantly reduce the residual stress peak value of longitudinal and transverse, but with the increase in number of symmetrical passes, from two to three, the welding sequence stress-reduction effect is weak or not significantly changed, so that can be used in the project
The temperature field and stress field of the 2-D model was verified by experiment, and the different welding sequences in the curves of stress distribution in the thickness direction, comparison residual stress fields of different welding sequences were studied
Summary
Thick plates are widely used in nuclear power plants, ships, large bridges, etc. [1,2]. Significant constraint conditions [3] in the thick-plate welding process mean that complex residual stresses are generated owing to the need for multiple welding passes. Numerical simulation has become an important tool to predict welding residual stress, but the ability to simulate the structure is always limited by available computing power in such transient non-linear models aimed at reducing the welding process, and time, complexity [4,5]. The numerical simulation analysis of welding is generally divided into two parts: the welding temperature field and the welding stress field [9,10,11,12,13]. The analysis of the temperature field is a representative problem concerning non-linear transient effects. The welding temperature field is both uneven and unstable [14]
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