Investigation on Porosity Content in 2024 Aluminum Alloy Welding by Yb:YAG Disk Laser

2011 ◽  
Vol 383-390 ◽  
pp. 6265-6269 ◽  
Author(s):  
V. Alfieri ◽  
F. Cardaropoli ◽  
F. Caiazzo ◽  
V. Sergi
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Beam Quality ◽  
Welding Process ◽  
Porosity Formation ◽  
2024 Aluminum Alloy ◽  
Disk Laser ◽  
Aluminum Alloy 2024 ◽  
Slab Lasers

Aluminum alloy 2024 is extensively used in automotive and aerospace industries, but its application is limited due to the susceptibility to generate porosity during the welding process. Nevertheless, benefits from laser welding are clearly demonstrated. In addition, the use of a disk laser allows to obtain significant reduction in focus diameter and increased beam quality compared to traditional rod or slab lasers. The aim of the work is to discuss porosity formation as influenced by the thermal input provided, so bead-on-plate specimens in different conditions have been prepared. Porosity content is examined in relation to the fused zone extent and discussed considering interaction between laser and material. Higher thermal inputs are beneficial in full penetrative welds.

Segmentation of Molten Pool Infrared Images Using Morphology during High Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 91-94
Author(s):  
Yan Xi Zhang ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
Welding Process ◽  
Histogram Equalization ◽  
Welding Quality ◽  
Infrared Images ◽  
Traditional Methods ◽  
Disk Laser ◽  
Laser Welding Process

Configuration of a molten pool is related to the laser welding quality. Analyzing the configuration of a molten pool is important to monitor the laser welding process. This paper proposes a method of segmentation of a molten pool and its shadow during high power disk laser welding, consequently provides the groundwork for reconstruction of the molten pool and analysis of welding quality. Subsection linear stretching histogram equalization was applied to enhance the contrast of the original images firstly, and then edge detection was used to highlight the edges. After that we used the morphology filtering method to produce the segmentation mask, and then combined the mask with the original images to get the final segmentation results. Also, the proposed method was compared with other traditional methods. The experimental results showed that our method not only could give better segmentation results and process large quantities images automatically, but also overcame the less-segmentation problems of traditional methods.

An Experimental Investigation of the Yield Loci of 1100-0 Aluminum, 70:30 Brass, and an Overaged 2024 Aluminum Alloy After Various Prestrains

1986 ◽  
Vol 108 (4) ◽  
pp. 313-320 ◽  
Author(s):  
D. E. Helling ◽  
A. K. Miller ◽  
M. G. Stout
Keyword(s):  
Aluminum Alloy ◽  
Small Strain ◽  
Yield Locus ◽  
Material Behavior ◽  
Shear Stresses ◽  
2024 Aluminum Alloy ◽  
Yield Loci ◽  
Aluminum Alloy 2024 ◽  
Von Mises ◽  
Normal And Shear Stresses

The multiaxial yield behaviors of 1100-0 aluminum, 70:30 brass, and an overaged 2024 aluminum alloy (2024-T7) have been investigated for a variety of prestress histories involving combinations of normal and shear stresses. Von Mises effective prestrains were in the range of 1.2–32%. Prestress paths were chosen in order to investigate the roles of prestress and prestrain direction on the nature of small-strain offset (ε = 5 × 10−6) yield loci. Particular attention was paid to the directionality, i.e., translation and distortion, of the yield locus. A key result, which was observed in all three materials, was that the final direction of the prestrain path strongly influences the distortions of the yield loci. Differences in the yield locus behavior of the three materials were also observed: brass and the 2024-T7 alloy showed more severe distortions of the yield locus and a longer memory of their entire prestrain history than the 1100-0 aluminum. In addition, more “kinematic” translation of the subsequent yield loci was observed in brass and 2024-T7 than in 1100-0 aluminum. The 2024-T7 differed from the other materials, showing a yield locus which decreased in size subsequent to plastic straining. Finally, the implications of these observations for the constitutive modeling of multiaxial material behavior are discussed.

Characterization of disk-laser dissimilar welding of titanium alloy Ti-6Al-4V to aluminum alloy 2024

2013 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Francesco Cardaropoli ◽  
Gaetano Corrado ◽  
Vincenzo Sergi
Keyword(s):  
Titanium Alloy ◽  
Aluminum Alloy ◽  
Dissimilar Welding ◽  
Disk Laser ◽  
Aluminum Alloy 2024

Simulation of dendrite growth in the laser welding pool of aluminum alloy 2024 under transient conditions

2017 ◽  
Vol 246 ◽  
pp. 22-29 ◽  
Author(s):  
Lei Wang ◽  
Yanhong Wei ◽  
Xiaohong Zhan ◽  
Fengyi Yu ◽  
Xiyong Cao ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Dendrite Growth ◽  
Transient Conditions ◽  
Welding Pool ◽  
Aluminum Alloy 2024

Study of Plume Behavior during High-Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 1076-1079
Author(s):  
De Yong You ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
High Speed ◽  
Welding Process ◽  
Image Sequences ◽  
Process Conditions ◽  
High Speed Photography ◽  
Disk Laser ◽  
Industrial Manufacturing ◽  
Laser Welding Process

Laser welding process has been widely used in industrial manufacturing. The purpose of this paper is to explore the inter-relation between laser welding results and the laser-induced plume behavior. High-power disk laser welding of stainless steel type304 was performed at different welding speeds. Combing the high speed camera and ultraviolet sensing filter, the plume image sequences of laser welding process have been obtained. Plume features including plume volume and plume flowing direction have been extracted by using high-speed photography and image processing technology. The dynamic behavior of laser-induced plume was investigated. The results showed that the laser-induced plume feature, especially the plume volume, was closely related to laser welding process conditions.

scholarly journals Effect of Heat Input During Disk Laser Bead-On-Plate Welding of Thermomechanically Rolled Steel on Penetration Characteristics and Porosity Formation in the Weld Metal

2016 ◽  
Vol 61 (1) ◽  
pp. 93-102 ◽  
Author(s):  
A. Lisiecki
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
Welding Parameters ◽  
Depth Of Penetration ◽  
Porosity Formation ◽  
Disk Laser ◽  
Full Penetration ◽  
Wide Range ◽  
Weld Porosity ◽  
The Relationship

The paper presents a detailed analysis of the influence of heat input during laser bead-on-plate welding of 5.0 mm thick plates of S700MC steel by modern Disk laser on the mechanism of steel penetration, shape and depth of penetration, and also on tendency to weld porosity formation. Based on the investigations performed in a wide range of laser welding parameters the relationship between laser power and welding speed, thus heat input, required for full penetration was determined. Additionally the relationship between the laser welding parameters and weld quality was determined.

scholarly journals Influence Of Lubricants On Wear Resistance Of Aluminum Alloy Strips Series 2XXX

2015 ◽  
Vol 60 (3) ◽  
pp. 1833-1838
Author(s):  
K. Żaba ◽  
P. Kita ◽  
M. Nowosielski ◽  
M. Kwiatkowski ◽  
M. Madej
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
2024 Aluminum Alloy ◽  
Aluminum Alloy 2024 ◽  
Materials Used ◽  
Oil Company ◽  
Selection Of

Abstract The article presents a properly planned and designed tests of the abrasive wear resistance 2024 aluminum alloy strips under friction conditions involving various lubricants. Test were focused on the selection of the best lubricant for use in industrial environment, especially for sheet metal forming. Three lubricants of the Orlen Oil Company and one used in the sheet metal forming industry, were selected for tests. Tests without the use of lubricant were performed for a comparison. The tester T-05 was used for testing resistance to wear. As the counter samples were used tool steel - NC6 and steel for hot working - WCL, which are typical materials used for tools for pressing. The results are presented in the form of the force friction, abrasion depth, weight loss and coefficient of friction depending on the lubricant used and the type of counter samples. The results allowed for predicting set lubricant-material for tools which can be applied to sheet metal made of aluminum alloy 2024.

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