Study on the microstructure and properties of the laser welding of GTi70 and TC4 dissimilar materials
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摘要: 研究了GTi70与TC4异种钛合金材料激光焊接性能，通过接头常温、高温拉伸强度检测，焊缝组织XRD、OM、SEM检测分析，拉伸断口以及剪切断口形貌SEM分析，论证了异种材料的可焊性. 试验结果显示，异种材料接头常温拉伸强度高于GTi70母材，500，600和750 ℃高温拉伸强度高于TC4母材，焊缝拉伸断口、剪切断口均为韧性断裂，两种材料激光焊接性能良好. 脉冲激光焊缝组织更为细小，焊缝热影响区较窄，母材损伤小，焊缝强度与塑性优于连续激光焊缝.Abstract: This paper concentrates on the welding performance of GTi70 and TC4 dissimilar materials. The microstructure and mechanical properties of the welded joint with laser welding were investigated, which shows the weld ability of GTi70 and TC4.The micro structures and fracture morphologies of the welded joint were analyzed through OM, XRD and SEM, and the detailed analysis of tensile strength were performed. The results demonstrated that the tensile strength of welding joints were higher than GTi70 at room temperature, while the tensile strength was higher than TC4 at 500, 600 and 750 °C. The tensile fracture and shear fracture of welded joint were plastic fractures. In addition, compared to continuous laser welding seam, the micro structure and mechanical properties of pulsed laser welding seam were better.
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