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采用完全正交的方法进行工业纯钛激光焊接,分别对不同焊接功率和速度输入条件下焊缝表面成形和横断面进行观察,并利用光学显微镜、显微硬度计、扫描电镜等仪器对焊缝的微观形貌及力学性能进行了测试分析。结果表明,焊缝主要由粗大晶α晶粒和针状α晶粒组成,但在不同热输入情况下出现了锯齿状α晶粒和孪晶。焊缝和热影响区的显微硬度明显高于母材并且焊缝的硬度值最大,焊接接头的抗拉强度高于母材,焊接试样均断在母材。因此,选用高功率和高速度的焊接工艺参数,能使焊接过程尽快完成,从而提高生产效率。
Pure titanium laser welding was carried out by orthogonal method. Weld surface forming and cross section were observed under different welding power and speed conditions respectively. The weld seam was observed by optical microscope, microhardness tester and scanning electron microscope The microstructure and mechanical properties were tested and analyzed. The results show that the weld mainly consists of coarse α grains and acicular α grains, but sawtooth α grains and twins appear under different heat input conditions. The microhardness of weld and heat affected zone is obviously higher than that of base metal, and the hardness value of weld seam is the highest. The tensile strength of welded joint is higher than that of base metal, and the welding sample is cut off on base metal. Therefore, the selection of high-power and high-speed welding process parameters, the welding process can be completed as soon as possible, thereby enhancing production efficiency.