Study on Solidification Cracking of Laser Dissimilar Welded Joints by using in-Situ Observation and Numerical Simulation
Tóm tắt
This study is aimed at developing a systematic method for evaluation and prediction of solidification cracking in laser dissimilar welded joints (laser DWJ). The initiation of solidification cracking was observed directly by using a high speed camera during U-type hot cracking testing while laser welding. The high temperature ductility curves were obtained based on the local critical strains of the solidification cracks, measured by investigating each frame of the observation film. The distribution of residual liquid metal during solidification was investigated by using both high magnification and in-situ observation. Moreover, material properties at the elevated temperatures were measured by using a developed tensile test. The weld strain during laser welding was calculated by 3D finite element analysis by using the material properties obtained. Consequently, all the results helped to provide a comprehensive understanding of solidification cracking in laser DWJ.
Tài liệu tham khảo
Sun Z., Ion J.C.: Laser welding of dissimilar metal combinations, Journal of Material Sciences, 1995, vol. 30, no. 17, pp. 4205–4214.
Mai T.A.: Characterization of dissimilar joints in laser welding of steel-KOVAR, copper-steel and copper-aluminum, Materials Science and Engineering: A, 2004, vol. 374, no. 1/2, pp. 224–233.
Shinozaki K., Yamamoto M., Kawazaki A., Tamura T., Wen P.: Development of evaluation method for solidification cracking susceptibility of Inconel600/SUS347 dissimilar laser weld metal by in-situ observation, Materials Science Forum, 2008, vol. 580–582, pp. 49–52.
Wen P., Shinozaki K., Yamamoto M., Tamura T., Nemoto N.: In-situ observation of solidification cracking of laser dissimilar welded joints, Quarterly Journal of the Japan Welding Society, 2009, vol. 27, no. 2, pp. 134s–138s.
Kou S.: Welding Metallurgy, John Wiley & Sons, 2nd edition, 2002, pp. 263–295.
Senda T., Matsuda F.: Studies on solidification cracking susceptibility for weld metals with Trans- Varestraint test (1), Journal of the Japan Welding Society, 1972, vol. 41, no. 6, pp. 709–723.
Matsuda F, Nakagawa H., Tomita S.: Investigation of weld solidification Cracking by MISO technique (Report 1), Quarterly Journal of the Japan Welding Society, 1988, vol. 6, no. 3, pp. 394–400.
Feng Z.L.: A Methodology for quantifying the thermal and mechanical conditions for weld metal solidification cracking, PhD dissertation, Ohio State University, USA, 1993.
Wei Y.H., R.R Liu: Software package for simulation and prediction of welding solidification cracks, Science and Technology of Welding and Joining, 2003, vol. 8, no. 5, pp. 325–333.
Dong Z.B., Wei Y.H.: Predicting weld solidification cracks in multi-pass welds of SUS310 stainless steel, Computational Materials Science, 2006, vol. 38, no. 2, pp. 459–466.
Hu B., Richardson I.M.: Mechanism and possible solution for transverse solidification cracking in laser welding of high strength aluminium alloys, Materials Science and Engineering: A, 2006, vol. 429, 1/2, pp. 287–294.
Kotecki DJ., Siewert T.A.: WRC-1992 Constitution diagram for stainless steel weld metals: a modification of the WRC-1988 diagram, Welding Journal, 1992, vol. 71, no. 5, pp. 171s–178s.
F. Yoshida: Basics of elasto-plasticity mechanics, Kyoritsu Shuppan Co., Ltd. 1997, pp. 111–119.