Design of weld joints for non-autogenous laser welding of thick sections

2000 ◽  
Author(s):  
K. C. Meinert ◽  
E. W. Reutzel ◽  
R. P. Martukanitz ◽  
J. F. Tressler
Keyword(s):  
Laser Welding ◽  
Weld Joints

Research on Microstructure and Properties of Laser Welding DP1000 High-Strength Steel Weld Joints

2014 ◽  
Vol 41 (9) ◽  
pp. 0903003
Author(s):  
王金凤 Wang Jinfeng ◽  
王立君 Wang Lijun ◽  
杨立军 Yang Lijun ◽  
李慷 Li Kang ◽  
李笑雨 Li Xiaoyu ◽  
...  
Keyword(s):  
Laser Welding ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Weld ◽  
Microstructure And Properties ◽  
Weld Joints

In the Jewelry, Brazing and Laser Welding with Parameter Optimization

2012 ◽  
Vol 57 (2) ◽  
pp. 525-537
Author(s):  
M. Kallek ◽  
S. Ataoglu ◽  
Y. Yagci ◽  
H. Bozkurt ◽  
A. Gulluoglu
Keyword(s):  
Laser Welding ◽  
Parameter Optimization ◽  
The Other ◽  
Welding Parameters ◽  
Gold Alloys ◽  
Carat Gold ◽  
Weld Joints ◽  
Different Color ◽  
Jewelry Industry

In the Jewelry, Brazing and Laser Welding with Parameter OptimizationIn this study, brazing and laser welding were experimentally compared for 9, 14 and 18 carat gold alloys in different color. The gold alloys were joined by laser welding and brazing and the microstructure, hardness, chemical composition, color of the weld joints were investigated. According to study, in laser welding, voltage, pulse duration, pulse diameter and frequency are the most important welding parameters that influence the quality of joints. Welded joints are characterized using three geometric parameters: penetration depth, width of heat affected zone and underfill defects. Finally, optimum laser welding parameters of different color of 9, 14 and 18 carat gold alloys were determined. It is observed that laser welding has numerous advantages compared to the other joining techniques used in the jewelry industry.

Disk Laser Welding of ZE 41 Magnesium Alloy

2014 ◽  
Vol 1077 ◽  
pp. 71-75 ◽  
Author(s):  
Miroslav Sahul ◽  
Martin Sahul ◽  
Milan Turňa ◽  
Paulína Zacková
Keyword(s):  
Magnesium Alloy ◽  
Laser Welding ◽  
Laser Power ◽  
Solid State Laser ◽  
Shielding Gas ◽  
Micro Hardness ◽  
Disk Laser ◽  
Weld Joints ◽  
Focal Position ◽  
Edx Microanalysis

The paper deals with disk laser welding of magnesium alloy with the content of rare earth elements. ZE 41 magnesium alloy with the thickness of 2.0 mm was used as experimental metal. TruDisk 4002 solid state laser with a wavelength of 1.03 microns and a maximum power of 2.0 kW was used for welding of magnesium alloy. Laser power which was applied ranged from 0.6 to 1.2 kW. The focal position of laser beam was fixed on the surface of magnesium alloy and the welding speed was set to 70 mm/s. Argon with flow rate of 12 l/min was used as shielding gas. Light microscopy, EDX microanalysis and micro hardness measurements across base metal - fusion zone interface were carried out in order to analyze the weld joints.

Aesthetic Diode Laser Welding of Stainless Steel

2007 ◽  
Vol 344 ◽  
pp. 707-713 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Loredana Santo ◽  
Federica Trovalusci
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Diode Laser ◽  
Laser System ◽  
Laser Beam Welding ◽  
Tensile Load ◽  
Speed Ratio ◽  
Weld Joints ◽  
Significant Difference ◽  
Diode Laser Welding

In the present study the use of diode laser for stainless steel aesthetic welding is considered. In fact the surface smoothness of the weld bead, attributed to the mode stability of the laser system, suggests its application for aesthetic weld joint. The aims of this work were to: define a process map, based on an aesthetic criterion; mechanically characterize the weld joints (by Vickers micro-hardness and tensile test); analyse the surface of the specimens in terms of roughness. Moreover, gas tungsten-arc (TIG) weld joints were carried out and analogously tested to make a comparison with the diode laser results. Good aesthetic butt joints were obtained with diode laser welding. The same results were found working with constant power speed ratio (i.e. constant fluence). Comparison between TIG and Laser Beam Welding (LBW), showed no significant difference in roughness, while ultimate tensile load was higher for TIG welding. The differences in joint strength depend on the different cross-sectional area and on the extension and microstructure of the base metal, heat-affected zone and melted zone. However, diode laser technology allows to obtain smaller bead size.

To the Technology of Laser Welding of Aluminum with Titanium

2018 ◽  
Vol 938 ◽  
pp. 70-74
Author(s):  
A.N. Cherepanov ◽  
Vyacheslav I. Mali ◽  
V.O. Drozdov ◽  
Anatolii M. Orishich ◽  
Aleksandr G. Malikov
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Laser Welding ◽  
Strain Hardening ◽  
High Quality ◽  
Butt Welding ◽  
Weld Joints ◽  
Aluminum Part ◽  
Lower Tensile Strength

The results of experimental study of laser welding alloys based on aluminum and titanium an intermediate composite Al+Ti insert obtained by explosion, using nanopowder additives and plastic deformation of the aluminum seam are presented. Morphologically high-quality welds have been obtained both in the welding of the aluminum plate and of the titanium one with the corresponding parts of the insert. It was found out that breakdown of the joint in the tensile test occurred along the aluminum part of the insert, which had a lower tensile strength than the titanium. The use of the nanomodifier without plastic deformation increases the strength of the weld joint by about 10% compared to the unmodified compound. The use of nanomodifying and strain hardening can significantly increase the tensile strength, the value of which is more than 97% of the strength of alloy (AA1135). The carried out experiments on laser butt welding of plates made of aluminum alloy 1424 systems Al-Mg-Li-Zr-Sc with their subsequent plastic deformation have confirmed the effectiveness of strain hardening of weld joints of aluminum alloys.

Evolution of Microstructural and Mechanical Properties of Fiber Laser Welded Dual Phase Steels

2019 ◽  
Vol 391 ◽  
pp. 128-135 ◽  
Author(s):  
P.V.S. Lakshminarayana ◽  
J. Prakash Gautam ◽  
P. Mastanaiah ◽  
G. Madhusudan Reddy ◽  
K. Bhanu Sankara Rao
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Tensile Test ◽  
Fiber Laser ◽  
Heat Input ◽  
Weld Zone ◽  
Base Material ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Weld Joints

Over the past decade, Dual Phase steels are extensively used in the automotive industry to reduce the weight of the vehicles. The Fiber laser welding has been showing superior weld quality over other laser welding methods. DP 600 grade is most widely used grade among DP steels. Influence of heat input on microstructural and mechanical properties for the given thickness has been investigated. Widths of weld zone and Heat Affected Zone have decreased with decreasing the heat input. Rapid cooling rates in the fusion zone have resulted in martensitic structure and hardness also increased in proportional. Tensile test and notch tensile test of the welded joints have been confirmed that weld joints are stronger than that the base material. From the ensile test along the weld joint of all heat inputs, it has been observed that lower heat input weld joints have shown better properties over the others.

Strength characterization of assemblies of polymers, made by laser welding

2015 ◽  
Vol 103 (5) ◽  
pp. 503
Author(s):  
Vladimir Gantchenko ◽  
Jacques Renard ◽  
Alexander Olowinsky ◽  
Gerhard Otto
Keyword(s):  
Laser Welding ◽  
Strength Characterization

Effects of bottom plate in friction stir welding of AA6061-T6

2020 ◽  
Vol 118 (1) ◽  
pp. 108
Author(s):  
M.A. Vinayagamoorthi ◽  
M. Prince ◽  
S. Balasubramanian
Keyword(s):  
Mechanical Properties ◽  
Axial Load ◽  
Weld Zone ◽  
Welding Process ◽  
Bottom Plate ◽  
Welding Parameters ◽  
Nugget Zone ◽  
Friction Stir ◽  
Weld Joints ◽  
Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

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