Influences of laser welding parameters on the geometric profile of NI-base superalloy Rene 80 weld-bead

Moradi, Mahmoud; Ghoreishi, M.

doi:10.1007/s00170-010-3036-1

Cited by 34 publications

(12 citation statements)

References 12 publications

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“…A lower welding speed (300 mm/min) indicates higher heat input (heat input = average laser power/welding speed) causing the interface to attract additional laser energy to produce a wider fusion zone and further, a lower aspect ratio (Fig. 3a) as reported by Moradi and Ghoreishi [13]. In pulsed laser welding, the transfer of heat from molten pool is from the top of weld pool, towards bottom section by conduction and convection.…”

Section: Macrostructurementioning

confidence: 81%

Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Saravanan

Raghukandan

Sivagurumanikandan

2016

J Braz. Soc. Mech. Sci. Eng.

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Section: Macrostructurementioning

confidence: 81%

Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Saravanan

Raghukandan

Sivagurumanikandan

2016

J Braz. Soc. Mech. Sci. Eng.

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“…The Response Surface Methodology, RSM, is considered to be a set of mathematical and statistical techniques useful for modeling and predicting the desired response (Mahmoud Moradi et al, 2011. Also, the RSM specifies the relationships between one or more measured responses and the essential controllable input factors (Mahmoud .…”

Section: Response Surface Methodology (Rsm) Is a Set Of Statistical Tmentioning

confidence: 99%

Investigation on the Effects of Process Parameters on Laser Percussion Drilling Using Finite Element Methodology; Statistical Modelling and Optimization

Moradi

Golchin

2017

Lat. Am. j. solids struct.

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In the present research, the simulation of the Nickel-base superalloy Inconel 718 fiber-laser drilling process with the thickness of 1mm is investigated through the Finite Element Method. In order to specify the appropriate Gaussian distribution of laser beam, the results of an experimental research on glass laser drilling were simulated using three types of Gaussian distribution. The DFLUX subroutine was used to implement the laser heat sources of the models using the Fortran language. After the appropriate Gaussian distribution was chosen, the model was validated with the experimental results of the Nickel-base superalloy Inconel 718 laser drilling process. The negligible error percentage among the experimental and simulation results demonstrates the high accuracy of this model. The experiments were performed based on the Response Surface Methodology (RSM) as a statistical design of experiment (DOE) approach to investigate the influence of process parameters on the responses, obtaining the mathematical regressions and predicting the new results. Four parameters i.e. laser pulse frequency (150 to 550 Hz), laser power (200 to 500 watts), laser focal plane position (-0.5 to +0.5 mm) and the duty cycle (30 to 70%) were considered to be the input variables in 5 levels and four external parameters i.e. the hole's entrance and exit diameters, hole taper angle and the weight of mass removed from the hole, were observed to be the process output responses of this central composite design. By performing the statistical analysis, the input and output parameters were found to have a direct relation with each other. By an increase in each of the input variables, the entrance and exit hole diameters, the hole taper angel, and the weight of mass removed from the hole increase. Finally, the results of the conducted simulations and statistical analyses having been used, the laser drilling process was optimized by means of the desire ability approach. Good agreement between the simulated and the optimization results revealed that the model would be appropriate for laser drilling process numerical simulation.

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“…Other factors, such as the speed of the welding head and the flow of the gas, also affect the response but to a smaller degree. An increase in the power results in an increase of all of the geometrical dimensions of the bead [5]. Conversely, increases of the focal diameter or the speed cause a decrease of the same geometrical parameters.…”

Section: Determining the Weldability For Both Alloysmentioning

confidence: 99%

Weldability of the superalloys Haynes 188 and Hastelloy X by Nd:YAG

Graneix

Béguin

Pardheillan³

et al. 2014

MATEC Web of Conferences

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Abstract. The requirements for welded aircraft parts have become increasingly severe, especially in terms of the reproducibility of the geometry and metallurgical grade of the weld bead. Laser welding is a viable method of assembly to meet these new demands, because of automation, to replace the manual TIG welding process. The purpose of this study is to determine the weldability of Hastelloy X and Haynes 188 alloys by the butt welding process with a Nd:YAG laser. To identify the influential parameters of the welding process (laser power, feed rate, focal diameter and flow of gas) while streamlining testing, an experimental design was established with the CORICO software using the graphic correlation method. The position of the focal point was fixed at 1/3 of the thickness of the sheet. The gas flow rate and the power of the beam have a major effect on the mechanical properties and geometry of the weld. The strength of the weld is comparable to that of the base metal. However, there is a significant decrease in the elongation at break of approximately 30%. The first observations of the cross section of the weld by scanning electron microscopy coupled with EBSD analysis show a molten zone presenting dendritic large grains compared to the equiaxed grains of the base metals without a heat affected zone.

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Influences of laser welding parameters on the geometric profile of NI-base superalloy Rene 80 weld-bead

Cited by 34 publications

References 12 publications

Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Studies on metallurgical and mechanical properties of laser welded dissimilar grade steels

Investigation on the Effects of Process Parameters on Laser Percussion Drilling Using Finite Element Methodology; Statistical Modelling and Optimization

Weldability of the superalloys Haynes 188 and Hastelloy X by Nd:YAG

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