Investigation and Optimization of Disk-Laser Welding of 1 MM Thick Ti-6Al-4V Titanium Alloy Sheets

2014 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Ilaria Fierro ◽  
Vincenzo Sergi
Keyword(s):  
Arc Welding ◽  
Numerical Optimization ◽  
Structural Changes ◽  
Desirability Function ◽  
Laser Beam Welding ◽  
Laser Source ◽  
Space Vehicles ◽  
Plasma Arc Welding ◽  
Butt Welding ◽  
Disk Laser

Welded Ti-6Al-4V joints are employed in nuclear engineering, civil industries, military and space vehicles. Laser beam welding has been used for welding thanks to its advantages in terms of increase in penetration depth and reduction of possible defects; moreover a smaller grain size in the fused zone is benefited in comparison to either TIG and plasma arc welding, thus providing an increase in the tensile strength of the welded structures. The aim of this work is to develop and test the regression model for a number of crucial responses. The study has been carried out on 1 mm thick Ti-6Al-4V plates; a square butt welding configuration was considered employing a disk-laser source. A three level Box-Behnken experimental design is considered. An optimum condition has been suggested via numerical optimization of the desirability function with proper weights and importance of constraints. Vickers micro hardness testing was conducted to discuss structural changes in fused and heat affected zone.

Investigation and Optimization of Laser Welding of Ti-6Al-4V Titanium Alloy Plates

2013 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Gaetano Corrado ◽  
Francesco Cardaropoli ◽  
Vincenzo Sergi
Keyword(s):  
Laser Welding ◽  
Titanium Alloys ◽  
Arc Welding ◽  
Laser Source ◽  
Plasma Arc Welding ◽  
Butt Welding ◽  
Specific Strength ◽  
High Specific Strength ◽  
Welding Defects ◽  
Set Up

Titanium alloys are employed for several applications, ranging from aerospace to medicine. In particular, Ti-6Al-4V is the most common, thanks to an excellent combination of low density, high specific strength and corrosion resistance. Laser welding has been increasingly considered as an alternative to traditional techniques to join titanium alloys. An increase in penetration depth and a reduction of possible welding defects is achieved indeed; moreover a smaller grain size in the fused zone is benefited in comparison to either TIG and plasma arc welding, thus providing an increase in the tensile strength of the welded structures. The aim of this work is to develop the regression model for a number of responses which are crucial for the feature of the joint. The study was carried out on 3 mm thick Ti-6Al-4V plates; a square butt welding configuration was considered employing a disk-laser source. A 3-level factorial plan was hence arranged in a face-centred cubic scheme. The responses were analyzed referring to the governing parameters. Then, an optimization was carried out via statistical tools, in order to find the optimal welding set-up for the alloy under examination.

Effect of Mechanical Properties and Corrosion Behaviour of Martensitic Stainless Steel 410 1.6mm Butt Welded by Plasma Arc Welding

2019 ◽  
Vol 969 ◽  
pp. 601-606
Author(s):  
M. Sree Arravind ◽  
S. Ramesh Kumar ◽  
S. Senthil Kumaran ◽  
D. Venkateswarlu
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Tensile Test ◽  
Arc Welding ◽  
Martensitic Stainless Steel ◽  
Laser Beam Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Butt Weld ◽  
Welding Processes

Plasma Arc Welding (PAW) is one of the important arc welding processes used in electronics, medical, automotive and aerospace industries due its high accuracy and ability of welding any hard materials which is more tolerant to joint misalignment than Laser Beam Welding (LBW) at a lower cost. Thickness of 1.6mm plates were used to obtain full penetration and a strong joint with a very narrow Heat Affected Zone. The present study deals with the effect of mechanical and corrosion resistance properties of butt welded 1.6 mm thick martensitic stainless steel-similar (SS410 and SS410) joints made by plasma arc welding technique. Similar butt Welded joints were analyzed by using mechanical (Bend test, Erichsen cup test, Tensile test) characterization methods. Their corresponding corrosion resistance properties were also investigated by potentiodynamic polarization corrosion testing technique. The tensile strength was found to be 341 MPa for similar SS410 weld. During tensile test the failure occurred on the base metal on both similar joints Keywords: SS304; SS410; PAW; Butt weld; Erichsen Cup Test; Microstructure.

Effect of Microstructure and Mechanical Properties of Austenitic Stainless Steel 1.6mm Butt Welded by Plasma Arc Welding

2019 ◽  
Vol 969 ◽  
pp. 619-624
Author(s):  
S. Ramesh Kumar ◽  
S. Senthil Kumaran ◽  
M. Sree Arravind ◽  
D. Venkateswarlu
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Arc Welding ◽  
Laser Beam Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Bead Width ◽  
Butt Weld ◽  
Microscopic Images ◽  
Metal Joint

Plasma Arc Welding (PAW) is more tolerant to joint misalignment than Laser Beam Welding (LBW) at a lower cost [1]. The present study deals with the assessment of mechanical and metallurgical properties of butt welded 1.6 mm thick austenitic stainless steel similar (SS304 and SS304) by using plasma arc welding technique. Similar butt-Welded joints were analyzed by using mechanical (Bend test, Erichsen cup test, tensile test) and metallurgical (Optical macroscopic and microscopic images) characterization methods. The bead width and depth of the butt welded 1.6mm thick butt joined SS304 was analyzed by macroscopic and microscopic images [2]. The Erichsen cup test was conducted on the weld specimens. The indentation was made on the weld specimens. In the similar metal joint the depth of indentation is high, which shows that the similar metal joint has better formability. This makes them appropriate for practicing in the aircraft industries (engine parts), automotive sector (engine-parts and assemblies) chemical processing, food processing, turbine buckets, pumps and valve parts [3]. Keywords: SS304, PAW, Butt weld, Erichsen Cup Test, Microstructure

Analysis of the results of medium-energy electrons on the protective and thermoregulatory coatings of high-orbit satellites

2018 ◽  
pp. 156-171
Author(s):  
A. M. Shamayev ◽  
M. D. Ozersky
Keyword(s):  
Structural Changes ◽  
Protective Coatings ◽  
Experimental Studies ◽  
Thermal Control ◽  
Space Vehicles ◽  
Medium Energy ◽  
Electrostatic Discharges ◽  
High Orbit ◽  
Thermal Control Coatings ◽  
Solar Batteries

The results of experimental studies of the effect of electron irradiation on K-208 and CMG glasses used for manufacturing protective coatings of solar batteries and thermal control coatings of space vehicles are analyzed. It is shown that the caused electrostatic discharges lead to structural changes in the surfaces of the glasses studied. The goals of further studies of the influence of proton and electronproton effects on the properties of such coatings are outlined. 

Influence of Keyhole Mode of Plasma Arc Welding on Microstructure and Mechanical Properties of Similar Butt-Welded Incoloy 800H

2019 ◽  
Vol 45 (2) ◽  
pp. 1135-1142
Author(s):  
T. M. Harish ◽  
S. Jerome ◽  
B. Yadukrishna ◽  
Rishi S. Kumar ◽  
C. Midhun Suresh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Incoloy 800H ◽  
Microstructure And Mechanical Properties

scholarly journals Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 703
Author(s):  
Junnan Qiao ◽  
Chuansong Wu ◽  
Yongfeng Li
Keyword(s):  
Shear Stress ◽  
Weld Pool ◽  
Arc Welding ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Pressure ◽  
Ultrasonic Assisted

The acoustic radiation force driving the plasma jet and the ultrasound reflection at the plasma arc-weld pool interface are considered to modify the formulas of gas shear stress and plasma arc pressure on the anode surface in ultrasonic-assisted plasma arc welding (U-PAW). A transient model taking into account the dynamic changes of heat flux, gas shear stress, and arc pressure on the keyhole wall is developed. The keyhole and weld pool behaviors are numerically simulated to predict the heat transfer and fluid flow in the weld pool and dynamic keyhole evolution process. The model is experimentally validated. The simulation results show that the acoustic radiation force increases the plasma arc velocity, and then increases both the plasma arc pressure and the gas shear stress on the keyhole wall, so that the keyholing capability is enhanced in U-PAW.

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