Microstructure and Mechanical Properties of Laser Welding Joint of Inconel 718 Super Thin Sheet

2011 ◽  
Vol 391-392 ◽  
pp. 479-483 ◽  
Author(s):  
Shu Guo Zhang ◽  
Yu Hua Chen ◽  
Jun Hua Cui
Keyword(s):  
Laser Welding ◽  
Inconel 718 ◽  
Gas Flow ◽  
Focal Point ◽  
Thin Sheet ◽  
Weld Zone ◽  
Base Material ◽  
Welding Parameters ◽  
Yag Laser ◽  
Welding Joint

Nd-YAG laser welding characteristics of Inconel 718, microstructures,tensile properties,and hardness of welding joint were researched. Nd-YAG laser welding was carried out on super thin Inconel 718 sheet(0.2 mm thick) with 6 specimens. The welding parameters of these specimens are varied expect for the welding speed(0.3mm/s), gas-flow rate (5L/min) and clearance between focal point and (plate) surface(0).In this research,the tensile strength of welding joint was found to be inferior to base metal and the ductility of welds was considerably lower than base material,the microhardness in weld zone is higher than the base material hardness and the hardness is highest in center zone of welding joint. These conclusions will be in favour of the manufacture with super thin Inconel 718.

scholarly journals Disk Laser Welding of Armor Steel/ Spawanie Laserem Dyskowym Stali Pancernej

2014 ◽  
Vol 59 (4) ◽  
pp. 1641-1646 ◽  
Author(s):  
D. Janicki
Keyword(s):  
Laser Welding ◽  
Focal Point ◽  
Base Material ◽  
Steel Plates ◽  
Welding Parameters ◽  
Maximum Output ◽  
Butt Welding ◽  
Disk Laser ◽  
Armor Steel ◽  
Charpy Absorbed Energy

Abstract The paper describes the application of an Yb:YAG disk laser with a maximum output of 3.3 kW for the butt welding of armor steel plates ARMOX 500T 3.6 mm thick. The influence of laser welding parameters such as laser power beam, welding speed, focal point position on weld quality and mechanical properties of joints was studied. A proper selection of disk laser welding parameters provides non-porous and cracks free fully-penetrated welds with the aspect ratio up to 6.4. There was approx. 40% reduction in the hardness of heat affected zone (HAZ) in comparison to hardness of the base material (BM). The hardness values at the weld metal and the BM were similar. The joints exhibited about 15% lower ultimate tensile strength when compared with that of the BM. Charpy absorbed energy of the joints was approx. 30% lower than that of the BM.

Characteristics of the Keyhole and Energy Absorption during YAG Laser Welding of Al-Li Alloy

2011 ◽  
Vol 287-290 ◽  
pp. 2401-2406 ◽  
Author(s):  
Ai Qin Duan ◽  
Shui Li Gong
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
High Speed ◽  
Laser Energy ◽  
Welding Parameters ◽  
High Speed Camera ◽  
Welding Time ◽  
Welding Condition ◽  
Yag Laser ◽  
Temperature Area

In this paper, the keyhole of YAG laser welding 5A90 Al-Li alloy was observed and measured through the high speed camera. The characteristics of the keyhole and the effects of welding parameters were studied. The characteristics of the absorption of laser energy and the susceptivity for heat input in welding 5A90 were given. The results show that in this welding condition, the keyhole of laser welding 5A90 is nearly a taper and the highest temperature area is in the bottom. There are clear effects of heat input on the characteristics, especially the surface radius of keyhole and plasma/vapor in keyhole. Another phenomena is observed that sometime plasma/vapor could disappear in 0.3ms welding time, and this feature will be more remarkable as decrease of heat input. It shows that the absorption of energy is unsteady. It is known that when this instability reaches a certain value, an unsteady weld will be formed.

High powder CO2 and NdYAG laser welding of wrought Inconel 718

1996 ◽  
Vol 56 (1-4) ◽  
pp. 333-345 ◽  
Author(s):  
S. Gobbi ◽  
Li Zhang ◽  
J. Norris ◽  
K.H. Richter ◽  
J.H. Loreau
Keyword(s):  
Laser Welding ◽  
Inconel 718 ◽  
Yag Laser

Spectroscopic Analysis of the Plasma in Laser Welding of AZ31 Magnesium Alloy

2013 ◽  
Vol 341-342 ◽  
pp. 296-300
Author(s):  
Xiao Yan Gu ◽  
Huan Li ◽  
Ying Gao
Keyword(s):  
Magnesium Alloy ◽  
Laser Welding ◽  
Laser Plasma ◽  
Spectroscopic Analysis ◽  
Plasma Temperature ◽  
Cooling Effect ◽  
Az31 Magnesium Alloy ◽  
Welding Parameters ◽  
Yag Laser ◽  
The Relationship

AZ31 magnesium alloy was welded by the YAG laser. The plasma of laser welding was studied by the spectra and the plasma temperature was also calculated. The relationship between the welding parameters and plasma temperature was studied. The paper shows that the cooling effect of the plasma using helium is significant. Laser plasma temperature decreases from the center to the periphery and the temperature in the center is higher than 9000K. The evaporation of Mg element concentrates in the center of the laser plasma.

Effects of Nd: YAG Laser Welding Parameters on the Microstructure of 21% Cr Ferritic Stainless Steel

2011 ◽  
Vol 291-294 ◽  
pp. 999-1002
Author(s):  
Ke Ping Geng ◽  
Sheng Sun Hu ◽  
Jun Qi Shen ◽  
Jian Han ◽  
Hai Gang Xu
Keyword(s):  
Laser Welding ◽  
Optical Microscope ◽  
Welding Parameters ◽  
Slow Cooling ◽  
Yag Laser ◽  
Average Grain Size ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
The Relationship ◽  
Scanning Electron

21% Cr with Ti-Nb dual stabilized ferritic stainless was welded using Nd: YAG laser. The relationship between microstructure and parameters of laser welding was examined. The microstructure was investigated by using the optical microscope and scanning electron microscopes. The average grain size of the HAZ was increased with increasing heat input due to the slow cooling rate. Large precipitates as TiN, TiC and Nb(C,N) were dissolved in the HAZ. Fine precipitates which supposed to be TiC was formed uniformly distributed in the case of the fusion zones.

Study on the Microstructure and the Mechanical Properties of TA2

2012 ◽  
Vol 472-475 ◽  
pp. 2655-2658
Author(s):  
Xiao Dong Hu ◽  
Sen Zhang ◽  
Yong Zhang ◽  
Ya Jiang Li
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Arc Welding ◽  
Weld Zone ◽  
Base Material ◽  
Annealing Treatment ◽  
Welding Joint

The microstructure and the mechanical properties of welding joint with the material of TA2 have been studied in this paper with the specimens made with the method of argon-arc welding. The microhardness of the welding joint has been compared with the hardness in the same position of the weld joint after annealing. Conclusions have been obtained as follows: The organizations of the welding joint include base material, recrystallization zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as M-shape with the softest point located at the center, and the hardest is located at the overheated zone; the annealing treatment can enhance the weld joint hardness mainly at the center, and the hardness of other zones change little.

Study on Quality Control of the Laser Welding Joint

2013 ◽  
Vol 442 ◽  
pp. 276-281
Author(s):  
Qiang Wu ◽  
Lan Ying Xu
Keyword(s):  
Laser Welding ◽  
Salt Water ◽  
Harmful Effect ◽  
Welding Process ◽  
High Strength ◽  
Galvanized Steel ◽  
Welding Parameters ◽  
Test Results ◽  
Welding Joint ◽  
Corrosion Rates

During laser welding process of high-strength galvanized steel, adopting guiding arc plate and the connecting arc plate can avoid harmful effect resulted in unstable melting width. The galvanized layer protecting joint is inevitably lost by having been burned, which affects stain resistance of welding joint. So salt water with the concentration of 3% is used in the corrosion test for the samples welded under different laser parameters, mass variation and metallographic microscopes are gained after joint being corroded. The test results indicate that the corrosion rates of the joint are different under different welding parameters during laser welding of high-strength galvanized steel; their average corrosion rates are coincident with that of base metal and laser welding technology hardly effect corrosion resistance of the joint.

Influence of the mode of laser welding parameters on microstructural morphology in thin sheet Ti6Al4V alloy

2020 ◽  
Vol 131 ◽  
pp. 106456
Author(s):  
Bikash Kumar ◽  
Swarup Bag ◽  
C.P. Paul ◽  
C.R. Das ◽  
R. Ravikumar ◽  
...  
Keyword(s):  
Laser Welding ◽  
Thin Sheet ◽  
Ti6al4v Alloy ◽  
Welding Parameters ◽  
Microstructural Morphology

Study on the Microstructure and the Mechanical Properties of Zr R60702

2012 ◽  
Vol 510 ◽  
pp. 679-682 ◽  
Author(s):  
Xiao Dong Hu ◽  
Sen Zhang ◽  
Yong Zhang ◽  
Ya Jiang Li
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Arc Welding ◽  
Weld Zone ◽  
Base Material ◽  
Annealing Treatment ◽  
Welding Joint

The microstructure and the mechanical properties of welding joint with the material of R60702 have been studied in this paper with the specimens made with the method of argon-arc welding, and the according mechanical properties of the weld joint have been compared with the annealed microstructure at the temperature of 600.Conclusions have been obtained as follows: The organizations of the welding joint include base material, normalizing zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as W-shape with the hardest point located at the center, and the softest points is located at the normalizing zone; the annealing treatment can improve the ductility and soften the weld joint mainly at the center.

scholarly journals The effect of laser welding power on the properties of the joint made of 1.4462 duplex stainless steel

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401775194 ◽  
Author(s):  
Robert Sołtysiak ◽  
Tomasz Giętka ◽  
Agnieszka Sołtysiak
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Laser Power ◽  
Gas Flow ◽  
Weld Zone ◽  
Steel Plates ◽  
Joint Surface ◽  
Welding Parameters ◽  
Butt Welding ◽  
Protective Gas

The butt welding of 1.4462 (2205) duplex stainless steel plates with thickness of 4 mm under various welding parameters was achieved by Nd:YAG laser type without the use of the filler material. Welding parameters such as welding power (kW) and the focus distance from the joint surface (mm) were changed. The Ar 5.0 protective gas flow and welding speed were the same for all the tests and were 20 L/min and 0.5 m/min, respectively. The weld shape, weld macrostructure, microstructure, strength and hardness, and the content of the ferrite in the weld zone, heat-affected zone, and base metal were emphatically investigated. The test results showed that increase in laser power increases the weld zone area. For the weld samples, a better ferrite/austenite ratio was obtained by focusing the laser beam on the sheet surface. Furthermore, the largest elongation from strength test has been observed for the weld samples made with laser power of 2.0 kW.

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