Magod Laser Machining Pvt Ltd

Banglore, India

Magod Laser Machining Pvt Ltd

Banglore, India

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Buddu R.K.,Indian Institute for Plasma Research | Chauhan N.,Indian Institute for Plasma Research | Raole P.M.,Indian Institute for Plasma Research | Natu H.,Magod Laser Machining Pvt. Ltd
Fusion Engineering and Design | Year: 2015

Austenitic stainless steel is widely used structural material for the fabrication of the fusion reactor components. Laser welding is high power density process which offers several advantages over the other conventional processes like Tungsten Inert Gas welding. The features like low distortion, narrow heat affected zone, deep penetration in single pass, good mechanical properties are some of the advantages of laser welding process. The laser weld process parameters optimization has several challenges in terms of overcoming the weld defects like voids due to lack of penetration over depth, undercuts and porosity. The present paper reports the studies carried out with CO2 laser welding of 8 mm thick austenitic stainless steel SS304L plates and their characterization of mechanical properties, microstructure and fracture morphology details. The weld process parameter optimization towards defect free welds with full penetration welding has been carried out. The welded samples have shown tensile properties comparable to base metal, bend tests are successfully passed. The hardness measurements have shown slightly higher for weld zone compared to base metal and the impact fracture tests have shown lower values for the weld zone (WZ) and heat affected zone (HAZ) compared to base metal (BM). Microstructure studies revealed the combined dendrite and columnar type features attributed to the higher cooling rates involved with laser welding process. Delta ferrite is observed in small residual contents in the weld zone and confirmed with Ferrite Number (FN) data. Scanning electron microscopy (SEM) studies have been carried out for the surface fracture morphology analysis for the tensile and impact tested samples to understand the ductile and brittle fracture details. © 2015 Elsevier B.V. All rights reserved.


D'Souza A.,Indian Institute of Technology Indore | Naikwad S.,Indian Institute of Technology Indore | Palani I.A.,Indian Institute of Technology Indore | Padmanabhan R.,WABCO | And 3 more authors.
Proceedings of 2015 International Conference on Robotics, Automation, Control and Embedded Systems, RACE 2015 | Year: 2015

Laser forming is a flexible manufacturing process which has potential use in the manufacturing and automotive industry. In this process, a high power laser scans the metal sheet across its length. The metal sheet absorbs the laser and a steep temperature gradient is generated across the sheet thickness. The induced uneven thermal stresses, and the resulting bending moments, during the process deform the sheet metal without the use of any external forces. In this paper, steel sheets of FE-410 are bent using high power CO2 laser. Experiments were performed on 5 mm and 3 mm FE-410 steel sheets using CO2 Laser with maximum energy of 3000 W. Various parameters were varied namely power (1.5 KW to 3 KW), number of passes (0 to 130), scan speed (10 to 30 mm/s), laser spot diameter (4 mm to 13 mm) and frequency (500 Hz to 20000 Hz) to get maximum bend angle. The variation in the bend angle with respect to the power, scan speed, spot diameter, number of passes and thickness is studied. A data set of 320 samples is obtained from the experiment. This data set in the form of multi-input and single output is used to develop an optimum artificial neural network model to predict the bend angle. Here the output variable is bend angle and input variables are laser power, scan speed, spot diameter, sheet thickness and number of passes or scans. Micro-structure analysis of the deformed region and the heat affected zone in comparison with the base material is done. And a comparative study of the variation in micro-hardness of all these regions is done. © 2015 Hindustan University.


Yadav A.,Indian Institute for Plasma Research | Joshi J.,Indian Institute for Plasma Research | Singh D.K.,Indian Institute for Plasma Research | Natu H.,Magod Laser Machining Pvt. Ltd. | And 3 more authors.
Fusion Engineering and Design | Year: 2015

A vacuum seal using the lip sealing technique is emerging as the most likely choice for fusion devices, to comply with the requirement of maintainability. The welding technology considered for lip sealing is laser welding, due to the attributes of small spot diameter, low concentrated heat input, high precision and penetration. To establish the process, an experiment has been conducted on a sample size of 150 mm × 50 mm having thickness of 2 mm, material AISI304L to assess the dependence of beam parameters like, laser power, speed and focusing distance on penetration and quality of weld joint. Further, the assessment of the effect of welding set-up variables like air-gap between plates, plate misalignment, and laser beam misalignment on the weld quality is also required. This paper presents the results of this experimental study and also the plan for developing a large (∼10 m) size laser welded seal, that simulates, appropriately, the configuration required in large dimension fusion devices. © 2015 Elsevier B.V. All rights reserved.


Souza A.,Indian Institute of Technology Indore | Palani I.A.,Indian Institute of Technology Indore | Naikwad S.,Indian Institute of Technology Indore | Padmanabhan R.,WABCO | And 3 more authors.
Materials Today: Proceedings | Year: 2015

Laser forming is an advanced manufacturing process which has potential use in manufacturing and automotive industry. In this process, sheet metal is bent by creating a steep temperature gradient across the sheet thickness by using a high power CO2 laser. The material deforms due to thermal mechanical stresses induced in the material due to laser heating. In this paper, steel sheets of FE410 are bent using solid state CO2 laser. Experiments were performed on 8mm steel sheets using CO2 Laser with maximum energy of 3000W. Various parameters were varied namely power (2KW to 3KW), number of passes(1to 210), scan speed(10 to 30mm/s), laser spot diameter (9mm to 13mm) and frequency(500Hz to 20000Hz) to get maximum bend angle. Microstructure analysis of the deformed region and the heat affected zone in comparison with the base material is done. Also the variation in hardness for all these regions is studied. An artificial neural network model is proposed for predicting the bend angle value. © 2015 Elsevier Ltd.

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