Grain growth and texture evolution of weld seam during solidification in laser beam deep penetration welding of 2219 aluminum alloy

2019 ◽  
Vol 6 (11) ◽  
pp. 1165e3 ◽  
Author(s):  
Yue Kang ◽  
Xiaohong Zhan ◽  
Chaoqi Qi ◽  
Litao Shi ◽  
Qixiao Wang
Keyword(s):  
Aluminum Alloy ◽  
Laser Beam ◽  
Grain Growth ◽  
Weld Seam ◽  
Texture Evolution ◽  
Deep Penetration ◽  
2219 Aluminum Alloy ◽  
Deep Penetration Welding

scholarly journals Grain Coarsening and Texture Evolution of Pre-Stretched 2219 Aluminum Alloy Sheets during Subsequent Solution Treatment

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 530 ◽  
Author(s):  
Lihui An ◽  
Jiguang Li ◽  
Shijian Yuan
Keyword(s):  
Aluminum Alloy ◽  
Grain Growth ◽  
Texture Evolution ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Stretch Forming ◽  
Forming Process ◽  
Deformation Degree ◽  
Grain Structures ◽  
2219 Aluminum Alloy

During the two-pass stretch forming process for manufacturing of thin-walled aluminum alloy sheet components, abnormal grain growth may happen if an improper pre-deformation degree was conducted before solution heat treatment, which is negative to the performance and surface quality of the final components. In order to overcome this problem, the effect of pre-stretching deformation was investigated on the change of grain structures of 2219 aluminum alloy sheets. The 2219 aluminum alloy sheets were pre-stretched with various deformation degrees, and then were heated to 540 °C for about 50 min for solution treatment. The grain structures before and after solution treatment were characterized using an optical microscope (OM) and electron back scattering diffraction (EBSD). Results show that the grains grew up gradually during the solution treatment with an increase of pre-stretching. The critical pre-stretching degree is about 3%. Once the pre-deformation exceeds 3%, the grain growth is significant, especially when it reaches 5%. Moreover, the pre-stretching has little influence on the orientation distribution. Some near a copper texture {112}<111> were generated as the pre-stretching degree was increased to 5%. All the results suggest that the pre-stretching before solution treatment cannot be larger than 3% in the two-pass stretch forming of a 2219 aluminum sheet.

Microstructure and Mechanical Properties of Aluminum Alloy/High Strength Steel Double Beam Laser Deep Penetration Welded Joint

2019 ◽  
Vol 944 ◽  
pp. 448-457
Author(s):  
Hong Xi Chen ◽  
Li Cui ◽  
Dong Qi Lu ◽  
Yao Qing Chang ◽  
Xu Xia ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Deep Penetration ◽  
Mechanical Resistance ◽  
Lap Joint ◽  
Beam Laser ◽  
Double Beam ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding

A new dual beam laser deep penetration welding technology for lap joint of 1.5 mm thick aluminum alloy and high strength steel was explored in this paper, and the effects of three different beam energy ratios (RS=0.25,0.33,0.5) on weld formation, interface microstructure and mechanical properties were studied. The result shows that under certain conditions of other parameters, double beam laser deep penetration welding process can be applied to lap joint of aluminum alloy / high strength steel with good weld shape when RS=0.25,0.33,0.5. As RS increases from 0.25 to 0.5, the penetration of the weld reduces from 575 μm to 424.2μm, the thickness of intermetallic compound (IMC) layer at the interface between aluminum alloy and weld metal reduces from 3.4 μm to 2.5 μm, the average microhardness of the IMC layer decreases from 771.1 HV to 571.9 HV, the mechanical resistance of the joint raises from 95.7N/mm to 115.2N/mm. When RS=0.5, double beam laser deep penetration welding of aluminum alloy / high-strength steel joints has the highest mechanical resistance of joints, because of the relatively good plastic ductility of the joint.

scholarly journals OCT Capillary Depth Measurement in Copper Micro Welding Using Green Lasers

2021 ◽  
Vol 11 (6) ◽  
pp. 2655
Author(s):  
Tobias Beck ◽  
Christoph Bantel ◽  
Meiko Boley ◽  
Jean Pierre Bergmann
Keyword(s):  
Laser Welding ◽  
Process Monitoring ◽  
Weld Seam ◽  
Welding Process ◽  
Direct Determination ◽  
Deep Penetration ◽  
Scanning System ◽  
Depth Measurement ◽  
Aspect Ratios ◽  
Deep Penetration Welding

The transition of the powertrain from combustion to electric systems increases the demand for reliable copper connections. For such applications, laser welding has become a key technology. Due to the complexity of laser welding, especially at micro welding with small weld seam dimensions and short process times, reliable in-line process monitoring has proven to be difficult. By using a green laser with a wavelength of λ=515, the welding process of copper benefits from an increased absorption, resulting in a shallow and stable deep penetration welding process. This opens up new possibilities for the process monitoring. In this contribution, the monitoring of the capillary depth in micro copper welding, with welding depth of up to 1 , was performed coaxially using an optical coherence tomography (OCT) system. By comparing the measured capillary depth and the actual welding depth, a good correlation between two measured values could be shown independently of the investigated process parameters and stability. Measuring the capillary depth allows a direct determination of the present aspect ratio in the welding process. For deep penetration welding, aspect ratios as low as 0.35 could be shown. By using an additional scanning system to superimpose the welding motion with a spacial oscillating of the OCT beam perpendicular to the welding motion, multiple information about the process could be determined. Using this method, several process information can be measured simultaneously and is shown for the weld seam width exemplarily.

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