scholarly journals Experimental investigations on the effect of heat input on CO2 laser welded Ti-6Al-4V plates

2020 ◽  
Vol 912 ◽  
pp. 032007
Author(s):  
Jai Singh Kurmia ◽  
A P Aravind ◽  
Vasareddy Mahidhara ◽  
K R Sampreeta ◽  
Deepan Bharathi Kannan T
Keyword(s):  
Co2 Laser ◽  
Heat Input ◽  
Experimental Investigations

Diode Laser Cladding on A5052 Aluminium Alloy for Wear Resistance

2005 ◽  
Author(s):  
Shingo Iwatani ◽  
Yasuhito Ogata ◽  
Keisuke Uenishi ◽  
Kojiro F. Kobayashi ◽  
Akihiko Tsuboi
Keyword(s):  
Wear Resistance ◽  
Aluminium Alloy ◽  
Diode Laser ◽  
Laser Cladding ◽  
Co2 Laser ◽  
Reaction Layer ◽  
Heat Input ◽  
Aluminium Content ◽  
Alloy Substrate ◽  
Clad Layer

In order to improve a wear resistance of aluminium alloy, we proposed a diode laser cladding on the surface of a A5052 aluminium alloy. Firstly, an applicability of diode laser to laser cladding was evaluated. In this result, application of diode laser made it possible to obtain stable beads in low heat input compared with CO2 laser. According to the increase in aluminium content in the obtained clad layer, the microstructure of the clad layer changed as γ (8∼20%) → γ + α (10∼30%) → Fe3Al (30%∼). At the interface between the clad layer and the aluminium alloy substrate, the reaction layer consisting of Fe2Al5 and FeAl3 formed. In the abrasion wear the obtained clad layers exhibited a higher wear resistance compared with the aluminium alloy.

Experimental Study on Monitoring of Heat Input in Continuous CO2 Laser Butt Welding of Dissimilar Thin Steels

2020 ◽  
Vol 7 (4) ◽  
pp. 399-425 ◽  
Author(s):  
Pardeep Pankaj ◽  
Lakshmi Narayan Dhara ◽  
Avinish Tiwari ◽  
Pankaj Biswas
Keyword(s):  
Experimental Study ◽  
Co2 Laser ◽  
Heat Input ◽  
Butt Welding ◽  
Continuous Co2 Laser

scholarly journals Experimental investigations on mechanical properties of friction stir welded AA2024-T3 joints

2021 ◽  
Vol 49 (2) ◽  
pp. 511-517
Author(s):  
Stephen Leon ◽  
G. Bharathiraja ◽  
V. Jayakumar
Keyword(s):  
Heat Input ◽  
Process Variable ◽  
External Source ◽  
Fusion Welding ◽  
Weld Strength ◽  
Friction Stir Weld ◽  
Experimental Investigations ◽  
Process Variables ◽  
Friction Stir ◽  
Tool Pin

Friction stir welding is a promising solid state metal joining technique. It can be used to join AA2024-T3 metal plates which cannot be welded using normal fusion welding. Post weld joint efficiency depends completely on the proper selection of process variables as the required heat input for this process is not supplied by an external source but an internal function of the variables. Apart from the process variables tool pin shape also plays a vital role on the delivery of better weld strength. A comparative experimental analysis was done to understand the improvement in the post weld properties on the usage of non-cylindrical tool pin. In order to optimise major process variable for cylindrical as well as non-cylindrical tool pin geometries thermal study had been carried out and optimum heat input conditions were analysed for AA2024-T3 plates. Comparative analyses on friction stir weld joints were made qualitatively and quantitatively to understand the improvement on the introduction of noncylindrical flat faced pin in the tool.

scholarly journals A Comparative Study of Laser-Induced Graphene by CO2 Infrared Laser and 355 nm Ultraviolet (UV) Laser

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1094
Author(s):  
Liyong Wang ◽  
Zhiwen Wang ◽  
Ali Naderi Bakhtiyari ◽  
Hongyu Zheng
Keyword(s):  
Co2 Laser ◽  
Laser Energy ◽  
Three Dimensional ◽  
Infrared Laser ◽  
Photothermal Effect ◽  
Experimental Investigations ◽  
Uv Laser ◽  
Laser Fluences ◽  
Few Layer Graphene ◽  
Surface Morphologies

Laser-induced graphene (LIG) is an emerging technique for producing few-layer graphene or graphene-like material that has recently received increasing attention, due to its unique advantages. Subsequently, a variety of lasers and materials have been used to fabricate LIG using this technique. However, there is a lack of understanding of how different lasers (wavelengths) perform differently in the LIG conversion process. In this study, the produced LIG on polyimide (PI) under a locally water-cooled condition using a 10.6 μm CO2 infrared laser and a 355 nm ultraviolet (UV) laser are compared. The experimental investigations reveal that under the same UV and CO2 laser fluence, the ablation of PI show different results. Surface morphologies with micron-sized and nanometer pores were formed by the UV laser under different laser fluences, whereas micron-sized pores and sheet structure with fewer pores were produced by the CO2 laser. Energy dispersive spectrometry and three-dimensional topography characterization indicate that the photochemical effects were also involved in the LIG conversion with UV laser irradiation. It is also observed through experiments that the photothermal effect contributed to the formation of LIG under both lasers, and the LIG formed on PI substrates by the CO2 laser showed better quality and fewer layers.

scholarly journals Experimental Investigations on Fusion Cutting Stainless Steel with Fiber and CO2 Laser Beams

2013 ◽  
Vol 41 ◽  
pp. 399-404 ◽  
Author(s):  
S. Stelzer ◽  
A.Mahrle ◽  
A. Wetzig ◽  
E. Beyer
Keyword(s):  
Stainless Steel ◽  
Co2 Laser ◽  
Laser Beams ◽  
Experimental Investigations

scholarly journals Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 799 ◽  
Author(s):  
Zhiyong Li ◽  
Gang Yu ◽  
Xiuli He ◽  
Shaoxia Li ◽  
Yao Zhao
Keyword(s):  
Mechanical Property ◽  
Cooling Rate ◽  
Heat Input ◽  
Unit Length ◽  
Laser Beam Welding ◽  
Fusion Welding ◽  
304 Stainless Steel ◽  
Dissimilar Welding ◽  
Experimental Investigations ◽  
Solidification Parameters

Laser beam welding (LBW) has been considered an effective fusion welding method for the dissimilar welding of 304 stainless steel and Ni. However, the principles governing the correlations between the heat input, weld dimension, solidified microstructure and mechanical properties have not been fully studied before. Therefore, LBW experiments with variable heat input were carried out. A transient, three-dimensional model considering liquid metal convection was developed, and solidification parameters such as temperature gradient (G), growth rate (R), and cooling rate (GR) were calculated through thermal analysis to validate the experimental results. Then, microhardness tests were carried out to verify the predications made by the simulation. Energy dispersive spectroscopy (EDS) measurements were performed to study the mass transfer. The results indicate that the joints produced by LBW were nearly defect-free. The heat input per unit length is more effective at characterizing the influence of heat input on weld dimensions. The heat input has a greater influence on the cooling rate (GR) than the morphology parameter (G/R). The results demonstrate that both the solidification characteristics and mechanical property are greatly affected by the thermal behavior in the molten pool.

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