scholarly journals MATLAB Image Treatment of Copper-Steel Laser Welding

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Massaud Mostafa ◽  
J. Laifi ◽  
M. Ashari ◽  
Z.A. Alrowaili
Keyword(s):  
Confidence Interval ◽  
Laser Welding ◽  
High Speed ◽  
Pure Copper ◽  
Copper Plate ◽  
High Speed Camera ◽  
Laser Parameters ◽  
Melted Zone ◽  
Laser Keyhole Welding ◽  
Dissimilar Laser Welding

Continuous Yb:YAG laser keyhole welding of the pure copper plate to steel 316L sheet is performed for different laser parameters. The laser-generated welding keyhole and weld melted zone are observed by a high-speed camera. The image is treated by MATLAB and simple code is built to calculate the keyhole and melted zone area. This treatment is validated by the actual welding measurements, and the accuracy of the measurements is tested by the confidence interval law. The images obtained of keyhole and melt zone area in dissimilar laser welding are treated and analyzed to study the effect of changing the laser parameters.

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.

Analysis of laser welding keyhole characteristics based on near-infrared high speed camera and X-ray sensing

2016 ◽  
Vol 24 (10) ◽  
pp. 2400-2407
Author(s):  
高向东 GAO Xiang-dong ◽  
李竹曼 LI Zhu-man ◽  
游德勇 YOU De-yong ◽  
张南峰 ZHANG Nan-feng
Keyword(s):  
Laser Welding ◽  
High Speed ◽  
Near Infrared ◽  
High Speed Camera ◽  
X Ray

Dynamic Growth and Coalescence of Drilled Voids in Pure Copper Sheets

2012 ◽  
Vol 13 (3-4) ◽  
Author(s):  
Shanxing Wu ◽  
Danian Chen ◽  
Dongfang Ma ◽  
Huanran Wang ◽  
Yanjun Hou
Keyword(s):  
High Speed ◽  
Pure Copper ◽  
Hopkinson Bar ◽  
Tensile Tests ◽  
Void Coalescence ◽  
High Speed Camera ◽  
Split Hopkinson ◽  
Dynamic Growth ◽  
Electron Microscopical ◽  
Sem Investigation

AbstractA series of tensile tests for pure copper sheets containing drilled holes of multi-configurations are carried out on a tensile split Hopkinson bar (TSHB) at a range of tensile velocities. The dynamic growth and coalescence of drilled voids were recorded by a high-speed camera. The results of scanning electron microscopical (SEM) investigation of microvoid evolution at edges of ruptured zones between drilled voids in recovered sheets show void coalescence mechanisms, which are similar to evolution of visualized drilled voids. The experimentally recovered and high-speed camera recorded evolution of drilled voids in pure copper sheets are compared with the numerical simulations involving different models for void coalescence in order to overcome the difficulty of assessing the validity of available models for void coalescence. The possible application of Thomason model and Brown–Embury model for void coalescence to thermoviscoplastic material was explored under impact tension, and the rapid local straining of intervoid ligament was revealed.

scholarly journals The Effect of Plume Generated on the Microstructural Behavior of the Weld Mixed Zone in High-Speed Laser Dissimilar Welding

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1556
Author(s):  
Su-Jin Lee ◽  
Seiji Katayama ◽  
Jong-Do Kim ◽  
Jeong Suh
Keyword(s):  
Laser Welding ◽  
Fusion Zone ◽  
High Speed ◽  
Welding Process ◽  
High Strength ◽  
Strength Properties ◽  
Material Behavior ◽  
Dissimilar Welding ◽  
Weld Fusion Zone ◽  
Dissimilar Laser Welding

Dissimilar laser welding has been researched to combine the excellent anticorrosion and high strength properties of Ti and the low weight and cost of Al. However, when welding dissimilar Al and Ti sheets, many kinds of intermetallic compound are easily generated. Therefore, intermetallic compounds and differences in material properties make joining such dissimilar metals very difficult. Previous studies clarified that ultra-high welding speed could suppress the weld defects. To elucidate the mechanism of Al and Ti dissimilar laser welding, material behavior of the weld fusion zone and components of fume generated during the ultra-high speed welding process were observed and analyzed using energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), high speed cameras, and a spectrometer. The results show that the atom movement of Al and Ti in the weld plume affects the behavior of elemental components distributed in the weld fusion zone.

Enhancement of EDM Performance by Using Copper-Silver Composite Electrode

2020 ◽  
Vol 38 (9A) ◽  
pp. 1352-1358
Author(s):  
Saad K. Shather ◽  
Abbas A. Ibrahim ◽  
Zainab H. Mohsein ◽  
Omar H. Hassoon
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
High Speed ◽  
Composite Electrode ◽  
Removal Rate ◽  
Pure Copper ◽  
High Speed Steel ◽  
Pulse On Time ◽  
Pulse Off Time

Discharge Machining is a non-traditional machining technique and usually applied for hard metals and complex shapes that difficult to machining in the traditional cutting process. This process depends on different parameters that can affect the material removal rate and surface roughness. The electrode material is one of the important parameters in Electro –Discharge Machining (EDM). In this paper, the experimental work carried out by using a composite material electrode and the workpiece material from a high-speed steel plate. The cutting conditions: current (10 Amps, 12 Amps, 14 Amps), pulse on time (100 µs, 150 µs, 200 µs), pulse off time 25 µs, casting technique has been carried out to prepare the composite electrodes copper-sliver. The experimental results showed that Copper-Sliver (weight ratio70:30) gives better results than commonly electrode copper, Material Removal Rate (MRR) Copper-Sliver composite electrode reach to 0.225 gm/min higher than the pure Copper electrode. The lower value of the tool wear rate achieved with the composite electrode is 0.0001 gm/min. The surface roughness of the workpiece improved with a composite electrode compared with the pure electrode.

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