A study on an efficient prediction of welding deformation for T-joint laser welding of sandwich panel Part II : Proposal of a method to use shell element model

• Published in: International journal of naval architecture and ocean engineering Vol. 6; no. 2; pp. 245 - 256
• Main Authors: Kim, Jae Woong, Jang, Beom Seon, Kang, Sung Wook
• Format: Journal Article
• Language: Korean
• Published: 2014
• Subjects: Sandwich panel; Thermal elasto-plastic analysis; Heat transfer analysis; Laser welding; Hetero-layered approach
• ISSN: 2092-6782; 2092-6790

I-core sandwich panel that has been used more widely is assembled using high power $CO_2$ laser welding. Kim et al. (2013) proposed a circular cone type heat source model for the T-joint laser welding between face plate and core. It can cover the negative defocus which is commonly adopted in T-joint laser welding to provide deeper penetration. In part I, a volumetric heat source model is proposed and it is verified thorough a comparison of melting zone on the cross section with experiment results. The proposed model can be used for heat transfer analysis and thermal elasto-plastic analysis to predict welding deformation that occurs during laser welding. In terms of computational time, since the thermal elasto-plastic analysis using 3D solid elements is quite time consuming, shell element model with multi-layers have been employed instead. However, the conventional layered approach is not appropriate for the application of heat load at T-Joint. This paper, Part II, suggests a new method to arrange different number of layers for face plate and core in order to impose heat load only to the face plate.