An Overview of TIG Welding of Ti6Al4V : Recent Developments
- Authors: Omoniyi, Peter O. , Mahamood, Rasheedat M. , Jen, Tien-Chien , Akinlabi, Esther T.
- Date: 2021
- Subjects: Microstructure , Optimization , Welding
- Language: English
- Type: Journal article
- Identifier: http://hdl.handle.net/10210/495042 , uj:44951 , DOI: 10.18280/rcma.310501 , Citation: Omoniyi, P.O., Mahamood, R.M., Jen, T.C. and Akinlabi, E.T., 2021. An Overview of TIG Welding of Ti6Al4V: Recent Developments. Revue des Composites et des Matériaux Avancés, 31(5). , ISSN: 1958-5799
- Description: Abstract: Titanium is a commonly used non-ferrous metal in the aerospace, chemical and nuclear industry, due to its unique structural and mechanical properties. Selection of suitable welding techniques and understanding of the effects of parameters corroboration to achieve a quality joint necessitated this article. The article presents recent researches in process parameters optimization done on Tungsten Inert Gas (TIG) welding of Ti6Al4V alloy. Furthermore, it discusses the effects of the parameters used in TIG welding technique on the weld quality, mechanical properties, and microstructure of joined plates. Pulsed TIG welding was found to be the most suitable type of welding for Ti6Al4V alloys based on its ease of use and reduced heat input compared to the conventional TIG welding.
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Characterization of TIG and MIG hybrid welding of type - 304 austenitic stainless steel
- Authors: Ogundimu, Emmanuel Olusegun
- Date: 2017
- Subjects: Gas tungsten arc welding , Stainless steel - Welding , Austenitic stainless steel - Welding , Welding
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/242297 , uj:24987
- Description: M.Ing. (Mechanical Engineering) , Abstract: Stainless steel is a member of iron based alloys with a good corrosion resistance property. Due to this good quality, stainless steel plates are increasingly used for building constructions materials food processing and kitchen equipment. Austenitic stainless steels are one of the best choices, as they combine noble corrosion performance and mechanical properties. Due to low carbon percentage in austenitic stainless steel, intergranular corrosion can be controlled. The use of stainless steels is imperative. In fact, the numerous applications of type 304 austenitic stainless steel make it omnipresent in our daily life. This research work is aimed to establish optimized process parameters that will result in defect-free weld joint. In this research work, studies were conducted on the material characterization of type 304 austenitic stainless steel hybrid weld produced by Tungsten inert gas (TIG) and Metal inert gas (MIG) welding Processes. The processes were carried out in three phases. In the first phase of welding, two similar 304 stainless steel plates were welded by MIG welding using welding current of 130A and 170A, , the second phase was produced by TIG welding using the currents of 130/150A, while third phase welding was an hybrid TIG-MIG welding produced at currents of 130/150 and 170/190A respectively. The effects of welding current and welding process on the mechanical properties of the welded joints were investigated for all the three types of butt weld joint. Optical microscopic analysis were done on the heat affected zone and weld zone to assessed the effect of the welding parameters and the welding process on the weld quality. Vickers microhardness tests were used to determine the hardness distribution of the welded zone and tensile testing was conducted to quantify the strength of the welded area to the base metal in order to establish the optimal process parameters...
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Data on assessment and exploratory statistical correlation data analysis of sintered Nd :YAG laser welded 2507 duplex stainless steel
- Authors: Olanipekun, Ayorinde Tayo , Mashinini, Peter Madindwa , Maledi, Nthabiseng Beauty
- Date: 2020
- Subjects: Spark plasma sintering , Welding , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/433562 , uj:37493 , Citation: Olanipekun, A.T., Mashinini, P.M. & Maledi, N.B. 2020. Data on assessment and exploratory statistical correlation data analysis of sintered Nd: YAG laser welded 2507 duplex stainless steel. Data in Brief 32 (2020) 106201. https://doi.org/10.1016/j.dib.2020.106201
- Description: Abstract: The effect Spark Plasma Sintering (SPS) parameters and Nd:YAG laser welding parameters such as sintering tempera- ture, sintering time, welding power, welding speed, on Vick- ers hardness mechanical properties of the Weld Zone(WZ) was statistically investigated. Rectangular plates of 2507 Du- plex Stainless Steel (DSS) fabricated by SPS were joined by Nd: YAG laser welding process. Linear regression analysis was performed on the data, followed by Pearson correlation anal- ysis to relate hardness with other predicting variables and show their statistical significance to hardness value of the weld zone.The evaluated R 2 which is 49%% was used to mea- sure the closeness of the data to the regression fitted line.
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Effect of post-weld heat treatment on the evolving properties of P355NL1
- Authors: Mamabolo, Masemenya
- Date: 2017
- Subjects: Welding , Shielded metal arc welding , Stainless steel - Welding , Gas tungsten arc welding , Residual stresses
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/269810 , uj:28667
- Description: M.Ing. (Mechanical Engineering) , Abstract: Post Weld Heat Treatment (PWHT) in the form of stress relieving consists of heating the steel to a temperature below the critical range to relieve the stresses resulting from welding. The mechanical and microscopic properties may also be affected during this process. The study of the effects of Post-Weld Heat Treatment on the evolving properties of the fine-grain carbon alloy steel P355NL1 was conducted, and presented in this report. The study focused on the mechanical and metallurgical properties of the material. The plates used were 6 mm thick with a length of 350 mm and a width of 150 mm; and they were welded using the Gas Metal Arc Welding (GMAW) method. After the welding; PWHT was performed on the plates, using a furnace with the specified temperature and time. A total of four plates were studied; where three plates underwent the same PWHT method, apart from the cooling methods. There was a control sample wherein the plate did not undergo any PWHT; the second plate was furnace-cooled; the third was air-cooled; while the fourth plate was water-cooled. A comparative study was done on the P355NL1 plates, using three testing methods, namely: the tensile test; the microstructure examination; and the microhardness test to investigate how the different cooling methods had affected the properties of the steel, compared to the control as the basis point of comparison. The hardness properties of air and furnace cooled P355NL1 steel decreased compared to the without sample. The tensile strength properties of the sample had shown some improvement for the water-cooled plate; the furnace and air-cooled samples had, however, decreased in terms of their tensile strength. The yield strength properties of the samples revealed similar findings. Although the metallurgical structures revealed different concentrations of darker (pearlite) and lighter (ferrite) grains in the base metal, the overall study showed that there were no significant changes in the microstructure, however, the cooling media employed can be recommended as required for tailored applications.
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