Effect of active gas on weld appearance and performance in laser-TIG hybrid welded titanium alloy

Shi, Jipeng; Song, Gang

doi:10.1016/j.ijlmm.2018.03.002

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…β grains rapidly grow and coarsen. Due to the rapid cooling of the melt pool, there is insufficient time for the grown and coarsened β phase to transform into a primary α phase, instead transforming into α′ martensite, which has the same crystal structure as the primary α phase [ 31 , 32 ]. The martensitic phases are parallel or staggered, with a maximum lath width of 458 nm in the field of view, and a certain amount of dislocations can be observed in some of the lath α′ martensite.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Laser Welding Thick-Walled TC4 Titanium Alloy with Flux-Cored Wire and Cable Wire

et al. 2023

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In the welding process of thick-walled titanium alloys, the selection of the wire type is one of the critical factors affecting the welding quality. In this paper, flux-cored and cable wires were used as filler materials in the welding of thick-walled titanium alloys. The macrostructure, microstructure, texture, and grain size of both welded joints were compared by employing an optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscope (TEM), and the tensile and impact properties were also evaluated. The comparison result showed that the fusion zone microstructure of both welded joints was dominated by a basketweave structure composed of interwoven acicular α′ martensite, whereas the microstructure of flux-cored wire welded joints was finer, and the degree of anisotropy was low. The strength of both welded joints was higher than that of the base metal, ensuring that fracture occurred in the base metal area during tension. The Charpy impact energy of the flux-cored wire welded joint was 16.7% higher than that of the cable wire welded joint, indicating that the welded joint obtained with the flux-cored wire performed better in the welding process of thick-walled titanium alloys.

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Section: Resultsmentioning

confidence: 99%

Comparative Study on Laser Welding Thick-Walled TC4 Titanium Alloy with Flux-Cored Wire and Cable Wire

et al. 2023

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“…They should be combined with qualitative and semi-qualitative evaluation results for a comprehensive analysis taking into consideration carbon monoxide. Paper [13] reports a study into the effect of protective gas composition with different CO 2 content on the appearance and efficiency of the welding seam in the process of hybrid welding with laser-tungsten inert gas (TIG). The paper does not specify the means of protection of employees.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the dynamics of carbon monoxide formation during gas welding processes

Berezutskyi

Khondak

Berezutska

2021

EEJET

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This paper reports a study of the air medium where welding processes take place, with special attention paid to the evolution of carbon monoxide (CO) in the working medium in the process of gas welding. Plots were constructed and polynomial dependences were obtained to show a change in the concentration of carbon monoxide in the air of the working area during gas welding. It was confirmed experimentally that the concentration of carbon monoxide exceeds the permissible sanitary and hygienic indicators MPC (20 mg/m3) during gas welding. As a result of the experiment, the effectiveness of the use of an additional device was proven, namely an umbrella gas concentrator, in order to capture welding gases that are formed during gas welding. It was established that the MPC is exceeded under certain working conditions and welding wire. The carbon monoxide formation during gas welding was analyzed; these processes were compared with electric arc welding. The mathematical dependences derived make it possible to assess the risks of the welders’ work and conclude that the electric arc welding is characterized by a much higher rate of CO evolution from the beginning of the welding process (8.5 mg/s), that speed then decreases over 20 s by 2 times (to 4.5 mg/s). In 90 s, the speed becomes constant, to 2 mg/s. In comparison, gas welding has almost the same rate of CO formation, namely 0.3–0.9 mg/s. By changing the types of welding wires used in gas welding and taking into consideration the type of material that needs to be welded (including the period of its use), it is possible to influence the volume of CO emissions entering the working area and an employee’s respiratory area

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“…Alternating titanium alloys partially and/or fully with light metals like Al is a good approach for lightweight vehicles [2]. However, due to the occurrence of oxidation and intermetallic compounds such as TiO 2 and TiAl during the fusion welding, it is difficult to obtain the enough mechanical properties such as microhardness and yield and tensile strengths [3]. For example, when joining Ti alloys by the conventional fusion welding such as gas tungsten arc welding (GTAW), laser welding (LW) and electron beam welding (EBW), the welds gives rise to formation of brittle intermetallic compounds (IMCs) in the welded area, resulting in loss in strength of the joint [4,5].…”

Section: Introductionmentioning

confidence: 99%

Realization of Enhanced Mechanical Properties of Solid-State Welded Ti Alloy with Commercial Purity

Kim

Song

Jeong

2022

Int. J. Precis. Eng. Manuf.

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In this study, we investigated the solid-state weldability of Ti alloys with commercial purity (grade 2). First, as a solid-state welding approach, we conducted friction welding at a rotation speed of 1600 rpm and a friction pressure of 15 kgf on rodtype specimens with a size of 15 mm (dia.) × 50 mm (length). Subsequently, the grain boundary characteristic distributions such as the grain size, shape, orientation, and misorientation angle of the welds were clarified by means of the electron backscatter diffraction method. To study the mechanical properties of the welds, we conducted Vickers microhardness and tensile tests. We found that the application of friction welding to Ti alloy led to a significantly refined grain size in the weld zone (0.84 μm) relative to that in the base material (11.4 μm), accompanied by an orientation change from <0001> in the base material to <2-1-10> in the weld zone. In addition, the mechanical properties of the welds were more enhanced than those of the base material: the microhardness and yield strength of the weld were approximately 20% and 2% higher, respectively, than those of base material. These enhanced mechanical properties are mainly due to grain refinement and orientation development during welding.

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Effect of active gas on weld appearance and performance in laser-TIG hybrid welded titanium alloy

Cited by 8 publications

References 26 publications

Comparative Study on Laser Welding Thick-Walled TC4 Titanium Alloy with Flux-Cored Wire and Cable Wire

Comparative Study on Laser Welding Thick-Walled TC4 Titanium Alloy with Flux-Cored Wire and Cable Wire

Determining the dynamics of carbon monoxide formation during gas welding processes

Realization of Enhanced Mechanical Properties of Solid-State Welded Ti Alloy with Commercial Purity

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