Investigation of tensile and high cycle fatigue failure behavior on a TIG welded titanium alloy

Ren, Duqiang; Jiang, Yun; Hu, Xiaoan; Zhang, Xian‐Zheng; Xiang, Xiaoping; Huang, Kai; Ling, Huixiang

doi:10.1016/j.intermet.2021.107115

Cited by 27 publications

(6 citation statements)

References 27 publications

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“…Возможность создания сварных конструкций из титановых сплавов позволит существенно расширить технологические возможности производства изделий транспортного и аэрокосмического назначения, чем объясняется актуальность исследований в данном направлении. Однако широко применяемые методы сварки плавлением, такие как лазерная, электронно-лучевая сварка, сварка в защитных газах приводят к формированию пористости, растрескиванию, снижению коррозионной стойкости материала сварного соединения [1][2][3].…”

Section: обработка металловunclassified

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Amirov¹,

Moskvichev²,

Иванов³

et al. 2022

Metal Working and Material Science

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Introduction. The technological process of fabrication products from titanium alloys is often complicated by low quality of welded joints during electric arc or gas-flame welding operations due to high residual stresses and deformations. An example of a successful solution to this problem is the development and implementation of such high-tech processes of metal joining as friction stir welding, which does not refer to the methods of fusion joining. Friction stir welding as an advanced technology is used to obtain joints of “soft” metallic materials, such as aluminum. For “hard” metallic materials, friction stir welding has been limited due to the high demands on welding tools. The aim of this work is investigation of the possibility of using a tool made of the nickel-based heat-resistant alloy ZhS6U in friction stir welding of the titanium alloy Ti-5Al-3Mo-1V. Results and discussion. Optical and scanning electron microscopy results revealed that the structure of the weld is typical of this type of welding, gradient, consisting of a heat-affected zone, thermo-mechanical affected zone and a stir zone with a fragmented structure. When varying welding parameters, it is shown that the defectiveness of the weld is affected to a greater extent by the axial load on the tool, which is caused by a significant difference in the thermal effect on the material. Metallographic analysis methods revealed dissolution of welding tool material fragments in the stir zone of the non-detachable joint. Fractographic analysis of the fracture surface shows that the fracture in the weld zone is ductile, although in this case there are brittle bridges. Varying the parameters of friction stir welding made it possible to obtain an indissoluble joint with at least 90 % of the strength of the base metal.

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Section: обработка металловunclassified

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Amirov¹,

Moskvichev²,

Иванов³

et al. 2022

Metal Working and Material Science

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“…Welded component failure is caused by inappropriate input process variables that have a big impact on the service quality. Fatigue cracking is a commonly known significant type of weld failure that regularly affects welded pipes during service time [6], [7]. Additionally, residual stress, mechanical behaviors of the material, and stress concentration are frequently sensitive to microstructure failure of welded joints [8].…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of TIG welding process variables on the mechanical properties of stainless steel-304 pipe welded joints

Yeshanew,

Mana

2024

Preprint

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Stainless steel weld joint quality optimization research has become necessary due to the rise in sudden welded pipe joint failure. The mechanical characteristics and weld quality are greatly influenced by the combined effect of controllable process parameters. This study sought to determine the ideal parameters and examine how tungsten inert gas welding process factors affected the mechanical characteristics of the stainless pipe weld joint. Welded features such as bead shape, size, and mechanical properties were studied related to the weld controllable factors in order to achieve the desired weld quality. Austenitic stainless-steel samples (AISI 304) having 90mm outer diameter and 5mm thick pipe was used for the study. Data were studied using analysis of variance to evaluate the effect of each factor and validated the model's suitability. The results show that the rate of gas flow had the greatest impact on the tensile strength and hardness, whereas the welding current had the main influential factor on the bending strength. Weld parameters were optimized by applying response surface methodology technic and validated using laboratory tests. According to the experiment, optimum weld parameters were 121.30amp, 14 Lit/min, and 2mm for current, gas flow, and root gap respectively. As a result of these parameters combination, optimized mechanical properties were determined including tensile strength of 1402.601N/mm2, hardness of 61.372HRA, and bending strength of 826.022Nm. The optimized parameters evolved from this research can be utilized in the fabrication process of TIG welding at the industries.

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“…Otani [ 31 ] proposed a back-shielding device at the back side of torch to protect the weld. Ren et al [ 32 ] used TIG welding to create the joint near α-Ti-based TA15 alloy. It was found that the martensite α′ phase formed in the HAZ and FZ can increase the hardness of the weld.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Shielding-Gas Flow Rate on the Mechanical Properties of TIG-Welded Butt Joints of Commercially Pure Grade 1 Titanium

Szwajka,

Zielińska-Szwajka,

Trzepieciński

2024

Materials

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This article proposes as a novelty the differentiation of shielding-gas flow rates from both sides of the tungsten inert gas (TIG)-welded butt joints of commercially pure (CP) grade 1 titanium tubes. Such an approach is aimed at economically reducing the amount of protective gas used in TIG closed butt welding. The effect of the shielding-gas flow rate on the properties of CP grade 1 titanium butt-welded joints made using the tungsten inert gas (TIG)-welding method. Butt-welded joints were made for different values of the shielding-gas flow from the side of the root of the weld. Argon 5.0 was used as the shielding gas in the welding process. As part of the research, the welded joints obtained were analysed using optical and scanning electron microscopy. The microstructural characteristics of the joints were examined using an optical microscope, and the mechanical properties were determined using hardness and tensile tests. It was observed that as the flow of the shielding gas decreases, the hardness of the weld material increases and its brittleness also increases. A similar trend related to the amount of gas flow was also noticeable for the tensile strength of the joints. The increase in the hardness of the weld and the heat-affected zone compared to the base metal is mainly related to the increase in the amount of acicular structure (α′ phase). The optimal gas flow rates from the side of the root of weld were found at the values of 12 dm3/min.

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Investigation of tensile and high cycle fatigue failure behavior on a TIG welded titanium alloy

Cited by 27 publications

References 27 publications

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Formation features of a welding joint of alloy Ti-5Al-3Mo-1V by the friction stir welding using heat-resistant tool from ZhS6 alloy

Investigating the effect of TIG welding process variables on the mechanical properties of stainless steel-304 pipe welded joints

The Influence of the Shielding-Gas Flow Rate on the Mechanical Properties of TIG-Welded Butt Joints of Commercially Pure Grade 1 Titanium

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