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首页> 外文期刊>Journal of Manufacturing Processes >Characteristics of fiber laser weldments of two phases (α + β) titanium alloy
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Characteristics of fiber laser weldments of two phases (α + β) titanium alloy

机译：两相（α+β）钛合金的光纤激光焊接件的特性

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Laser welding experiments are conducted at various welding conditions on Ti-6Al-4 V alloy plates by employing fiber laser. A special type of workpiece fixture having provision of supplying shielding gas is fabricated for the protection of weld bead efficiently from environmental contamination. The influence of process parameters i.e. welding speed on the development of non-homogeneous microstructure of the weld bead is investigated by conducting microstructural characterization in details. Different morphologies of martensitic phase such as alpha' martensite, massive alpha(m), blocky a and basket-weave structure are observed in the fusion zone. The variation in amount of alpha' martensite is observed within heat affected zone. The calculated cooling rate and microstructure evaluation in the fusion zone are consistent with the continuous cooling transformation curve of Ti-6Al-4 V alloy. Higher hardness is found in fusion zone of the weldments. At lower welding speeds (500- 600 mm/min), underfill weld defects and at higher welding speed (800 mm/min) the micro-pores are observed in the weld bead. However, sizes of micro-pores are within the acceptable range as per BSEN: 4678 European standard. The microhardness and tensile strength of weldments are increased with increasing welding speed due to the development of finer alpha' martensite in the fusion zone. For a fixed beam power of 1200 W, the most favorable range of welding speed (700- 800 mm/min) is identified which produced consistently high quality welds without crack and acceptable pore size. Vickers microhardness and tensile test results indicate that the optimal process parameters obtained in the current study can be suitably used in industries.
机译：通过使用光纤激光器在Ti-6Al-4 V合金板上的各种焊接条件下进行激光焊接实验。制造一种具有供应保护气体的特殊类型的工件夹具，以有效地保护焊道免受环境污染。通过进行微观结构表征，详细研究了工艺参数即焊接速度对焊道非均匀组织发展的影响。在熔合区观察到马氏体相的不同形态，例如α'马氏体，块状α（m），块状α和篮状组织。在热影响区内观察到α'马氏体数量的变化。计算得出的熔合区冷却速率和组织评价结果与Ti-6Al-4 V合金的连续冷却转变曲线一致。在焊件的熔合区发现较高的硬度。在较低的焊接速度（500-600 mm / min），底部填充焊缝缺陷和较高的焊接速度（800 mm / min）下，焊缝中会观察到微孔。但是，微孔的尺寸在BSEN：4678欧洲标准的可接受范围内。焊件的显微硬度和抗拉强度随着焊接速度的增加而增加，这归因于在熔合区形成了更细的α'马氏体。对于1200 W的固定光束功率，确定了最有利的焊接速度范围（700- 800 mm / min），可产生始终如一的高质量焊接，而不会出现裂纹和可接受的孔径。维氏显微硬度和拉伸试验结果表明，本研究中获得的最佳工艺参数可适用于工业。

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