Study on microstructure and properties of laser welded thin-walled straight seam titanium pipes
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摘要: 对薄壁Gr.1纯钛直缝焊管采用激光焊接方式焊接，并对试验获得的样管进行了宏观形貌、显微组织分析和力学性能测试。结果表明，直缝薄壁焊管焊缝宽度较窄，外焊缝宽度为1.51 mm，内焊缝宽度为0.98 mm。钛焊管焊缝微观组织主要为柱状α相、锯齿状α相和少量针状α相。扩口、压扁、反弯试验结果均合格。最后对样管进行胀管试验，胀幅达到18.4%，外观变形较为均匀。从胀管后微观组织可知，胀管后焊缝、热影响区以及母材大部分晶粒受到拉伸作用明显变形和破碎，并产生较多针状α相，但均没有产生裂纹。Abstract: The thin-walled Gr.1 pure titanium straight seam welded pipe was welded by laser, and the samples obtained from the experiment were analyzed for macroscopic morphology, microstructure and mechanical properties. The results show that the weld width of longitudinally welded thin-walled pipe is relatively narrow, with an outer weld width of 1.51 mm and an inner weld width of 0.98 mm. The microstructure of titanium welded pipe weld is mainly columnar α phase, serrated α phase and a small amount of needle shape α phase. The results of flaring, flattening, and reverse bending tests are all qualified. Finally, an expansion test was conducted on the sample tube, and the expansion amplitude reached 18.4%, with a relatively uniform deformation in appearance. From the microstructure after tube expansion, it can be seen that after tube expansion, most of the grains in the weld seam, heat affected zone, and base metal are significantly deformed and broken due to tensile action, and many needle shaped α phase grains are produced , but no cracks occurred.
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Key words:
- laser welding /
- titanium pipe /
- microstructure /
- mechanical properties /
- expand tube
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图 2 Gr.1纯钛焊接接头不同区域金相组织
（a）焊缝；（b）热影响区；（c）母材
Figure 2. The metallographic microstructure of Gr.1 welded joint in various zones
图 3 Gr.1焊管力学性能测试后外观
（a）拉伸；（b）压扁；（c）扩口；（d）反弯
Figure 3. Appearance of Gr.1 welded pipe after mechanical property test
表 1 Gr.1带卷主要化学成分
Table 1. Main chemical composition of Gr.1
% Fe C O N H Ti 其他 0.03 0.01 0.04 0.01 0.001 余量 ＜0.4 
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表 3 激光焊接工艺参数
Table 3. Laser welding process parameters
激光功率/W 焊接速度/(m·min−1） 离焦量/mm 600 0.75 +20
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