The Stress and Strain Analyses of J-Groove Welding on Low-carbon Steel for Gas Metal Arc Welding (GMAW)

• Main Authors: WANG, YAN-RU, 王艶茹
• Other Authors: Kang, YAW-HONG
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/5fvq77

碩士 === 國立高雄應用科技大學 === 機械工程系 === 105 === In this study, MSC.MARC software was used to perform simulation analyses on J -groove during gas metal arc welding (GMAW) process which can cause deviation at steel plate end, warping, and residual stress and distortion of welding bead due to welding heat conduction. The simulated welding material used was a 10mm thick low-carbon steel plate, The simulated J-groove models were referred to AWS specimen-specific and GWAW parameters, and Gaussian double ellipsoid heat source was adopted as the welding heat source. Based on four different welding influencing factors, experimental GMAW simulation analyses were done on J-groove by this paper, and its temperature field, deviation amount at steel plate end, and the changes in residual stress and strain were observed and analyzed. The first experimental simulation analyses were done on three different welding bead appearances of J-groove. The second experimental simulation analyses were done on different heat dissipation coefficients (50~250W/m2K). The third experimental simulation analyses were done on the effective welding absorption rates (0.4~0.8) of different welding methods. The fourth experimental simulation analyses were done on four different orders of welding beads. From different simulation experiments done by this paper, the data obtained from deviation amount at steel plate end, warping extent, residual stress and distortion amount of welding seam, etc. can be used to predict the actual deviation amount at steel plate end, warping, residual stress of welding bead and distortion amount, etc. while performing J-groove welding with GMAW.