scholarly journals Water Jet Guided Laser vs. Conventional Laser: Experimental Comparison of Surface Integrity for Different Aerospace Alloys

2018 ◽  
Author(s):  
Sagar Sarkar ◽  
Ashish Kumar Nath

Laser surface hardening of most of the industrial components require depth of surface modification in the range of 100–150 micron. Conventional laser surface hardening uses laser as a heat source to modify a particular area of the surface without melting in an inert gas environment. However, the hardened profile in this case shows peak hardness value at a certain depth from the top surface. Also, hardening the top surface to get relatively much higher hardness near the top surface in case of thin sheets becomes difficult due to accumulation of heat below the surface of the specimen which in turn lowers the cooling rate. Hence, self-quenching becomes inadequate. In the present study, an in-house fabricated laser processing head with coaxial water nozzle has been used to flow a laminar water-jet during the laser surface hardening process to induce forced convection at the top surface. Thus, heat gets carried away by the water-jet from the top surface and by the water from the bottom surface as well. Results show that with judicious selection of process parameters, it is possible to get higher hardness (800 HV) to that of conventional laser surface hardening (500 HV) at the top surface using this process. Present process can be used for those cases where high hardness values are required near the top surface specially for thin sheets and thermally sensitive materials.


Measurement ◽  
2017 ◽  
Vol 110 ◽  
pp. 230-238 ◽  
Author(s):  
D. Lehocká ◽  
D. Klichová ◽  
J. Foldyna ◽  
S. Hloch ◽  
P. Hvizdoš ◽  
...  

2016 ◽  
Vol 88 (5-8) ◽  
pp. 1687-1701 ◽  
Author(s):  
Ratnesh Kumar ◽  
Somnath Chattopadhyaya ◽  
Amit Rai Dixit ◽  
Bhabani Bora ◽  
Michal Zelenak ◽  
...  

2015 ◽  
Vol 669 ◽  
pp. 179-186 ◽  
Author(s):  
Anton Panda ◽  
Marek Prislupčák ◽  
Jozef Jurko ◽  
Iveta Pandová ◽  
Peter Orendáč

Abrasive water jet technology is among the unconventional ways of machining. In today's modern and progressive era is often used for cutting and machining of various types of materials because of lower costs and environmental impact, as the cutting tool is water, in our case, with the addition of abrasives. Objective of the measurements was to evaluate the impact of vibration on the technological head in abrasive water jet technology in changing the selected technological parameters and the flow rate of technological head. In the given experiment, the used material - steel Hardox 500 with a thickness of 10 mm. The effort was to investigate the effects of changes in the speed rate of technological head (by speeds - 40, 200, 400 mm / min) on the size of the vibration acceleration amplitude and its frequency. Based on the measured values ​​of vibration to the technological head create the database and from it is evaluated the data in selected softwares (LabVIEW, SignalExpress and Microsoft Excel). Findings and conclusions are formulated on the basis of graphical dependencies, envelopes frequency spectra and comparison chart of envelopes.


2017 ◽  
Vol 32 (15) ◽  
pp. 1707-1714 ◽  
Author(s):  
K. Bimla Mardi ◽  
A. R. Dixit ◽  
A. Mallick ◽  
Alokesh Pramanik ◽  
Beata Ballokova ◽  
...  

2021 ◽  
Vol 33 (1) ◽  
pp. 012015
Author(s):  
Levent Subasi ◽  
Jeremie Diboine ◽  
Aydemir Gunaydin ◽  
Cansinem Tuzemen ◽  
Ozan Can Ozaner ◽  
...  

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