The porosity formation mechanism in the laser welded joint of TA15 titanium alloy

Zhan, Xiaohong; Yan, Tingyan; Gao, Qingji; Zhu, Zhenxin; Bu, Hengchang; Wang, Zhengdong

doi:10.1088/2053-1591/ab1612

Cited by 18 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The size of the pores slightly grew with increasing the pre-heating temperature from ~40 μm at room temperature to the maximum size of ~50 μm after LBW at 800 • C. According to Zhan et al [31], the porosity of LBWed joints of TA15 titanium alloy can be caused by water absorption and Al evaporation. Apparently, an increase in the gas pores size was associated with increasing the pre-heating temperature which intensified the hydrogen accumulation and Al evaporation process [31]. These processes occurred during LBW because of very high laser power-density input [27].…”

Section: Weld Seam Microstructurementioning

confidence: 98%

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

et al. 2022

View full text Add to dashboard Cite

Section: Weld Seam Microstructurementioning

confidence: 98%

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

et al. 2022

View full text Add to dashboard Cite

“…The average value of the weld metal that had the lowest impact performance was 5.3 J. This was because the impact properties were closely related to the corresponding microstructure, and the base metal area was mainly composed of small α + β bimodal microstructures [40,41], where the thickness of parallel layers α was approximately 1-2 µm. And the welding metal zone was mainly coarse α′ martensite, while the average impact performance of the heat-affected zone was 7.2 J due to partial microstructure evolution in the heat-affected zone, resulting in higher performance.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Tailoring Weldability for Microstructures in Laser-Welded Near-α Titanium Alloy: Insights on Mechanical Properties

Zhang,

Cong,

Zeng

et al. 2024

Metals

View full text Add to dashboard Cite

With the development of lightweight aerospace structures, the use of the high-quality and efficient laser welding of near-α titanium alloys has received widespread attention and favor thanks to its superior comprehensive performance. The welding experiment of 3 mm thick TA15 titanium alloy was carried out by YAG laser welding, and the material weldability, microstructure, microhardness, and mechanical properties of welded joints were systematically studied. The results indicated that laser welding of TA15 titanium alloy can produce well-formed welded joints without defects such as cracks and porosity. The welded metal used was a typical basket-weave microstructure composed of a large number of α′ martensitic phases and a small number of high-temperature residual β phases, and the heat-affected zone was a staggered arrangement of undissolved α phase and needle-like α′ martensite. The microhardness of the welded joint showed a hump distribution, and the hardness of WM fluctuated between 410 and 450 HV since the martensitic transformation occurred during the solidification of the weld under thermal cycling, and the β phase changed to the needle-like α′ phase. The tensile test indicated that the fracture position was located in the base metal area, and the fracture morphology showed the equiaxial dimple morphology of different sizes in a ductile fracture mode. The welded metal had the lowest impact performance (average value of 5.3 J) because the weld area was predominantly coarse α′ martensite. This experiment conducted systematic, in-depth, and extensive research on welding processes, hardness, tensile, impact, and fracture mechanisms. Based on the special product applications in the aerospace field, it was more targeted and conducive to promoting the application of the welding process in this material.

show abstract

“…Также известно влияние канала плазмы, который при нарушении процесса сварки может привести к образованию вакуумной поры в СШ [23]. Кроме того, на образование пористости в сварном соединении в титановых сплавах оказывают влияние водород [23][24][25][26] и испарение алюминия в процессе сварки [27].…”

Section: Introductionunclassified

Structure and mechanical properties of welded joints from alloy based on VTI-4 orthorhombic titanium aluminide produced by pulse laser welding

Наумов

Панов

Chernichenko

et al. 2023

Izv.VUZ. Tsvet. Met.

View full text Add to dashboard Cite

Ti2AlNb-based alloys are promising materials for operation at high temperatures in aerospace industry. Meanwhile, the existing difficulties of weldability restrict opportunities of their application. This work is devoted to studies of welded joints from Ti2AlNb-based VTI-4 alloy, obtained using pulsed laser welding (PLW). The optimum PLW modes have been determined providing uniform faultless joint. The features of formation of external defects, internal pores, cracks and non-uniform penetration depth were detected depending on welding conditions. The main PLW parameters influencing on formation of welded joint are voltage and duration of laser pulse. It was demonstrated that at insufficient medium and high peak powers sawtooth seam roots and internal pores can be formed. However, at higher rates of energy input thermal hydraulic processes in welding bathe are violated, accompanied by metal splashing (spattering), heterogeneity of pulse imposition is observed. This leads to formation of cracks, higher porosity, heterogeneity of melting zone, and as a consequence, poor mechanical properties. Microstructure analysis of the welded joints obtained by means of PLW has demonstrated that the melting area is comprised of long dendritic grains of β phase, and the heat affected zone from two regions of β + α2 phases and β + α2 + O phases. Herewith, the achieved joint strength equals to ~80 % of the base metal produced using the optimum PLW mode.

show abstract

The porosity formation mechanism in the laser welded joint of TA15 titanium alloy

Cited by 18 publications

References 25 publications

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

Tailoring Weldability for Microstructures in Laser-Welded Near-α Titanium Alloy: Insights on Mechanical Properties

Structure and mechanical properties of welded joints from alloy based on VTI-4 orthorhombic titanium aluminide produced by pulse laser welding

Contact Info

Product

Resources

About