Residual Stress Pattern Prediction in Spray Transfer Multipass Welding by Means of Numerical Simulation

  1. Esnaola, Jon Ander 1
  2. Ulacia, Ibai 1
  3. Lopez-Jauregi, Arkaitz 1
  4. Ugarte, Done 1
  1. 1 Structural Mechanics and Design, Engineering Faculty, Mondragon Unibertsitatea, Mondragón, Spain
Libro:
Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

ISBN: 9781789231069,  9781789231076

Año de publicación: 2018

Tipo: Capítulo de Libro

DOI: 10.5772/INTECHOPEN.72134 GOOGLE SCHOLAR lock_openAcceso abierto editor

Resumen

One of the main problems of gas metal arc welding (GMAW) process is the generation of residual stresses (RS), which has a direct impact on the mechanical performance of welded components. Nevertheless, RS pattern prediction is complex and requires the simulation of the welding process. Consequently, most of the currently used dimensioning approaches do not consider RS, leading to design oversized structures. This fact is especially relevant in big structures since it generates high material, manufacturing and product transportation costs. Nowadays, there are different numerical methods to predict the RS generated in GMAW process, being Goldak’s method one of the most widely used model. However, the use of these methods during the design process is limited, as they require experimentally defining many parameters. Alternatively, in this chapter, a new methodology to define the heat source energy based on the spray welding physics is exposed. The experimental validation of the methodology conducted for a multipass butt weld case shows good agreement in both the temperature pattern (9.16% deviation) and the RS pattern (42 MPa deviation). Finally, the proposed methodology is extended to analyse the influence of the thickness and the number of passes in the RS pattern of thick T-joint welds.

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