scholarly journals Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
A. El-Batahgy ◽  
M. Kutsuna
Keyword(s):  
Fusion Zone ◽  
Base Metal ◽  
Welding Speed ◽  
Filler Metal ◽  
Surface Cleaning ◽  
Solidification Cracking ◽  
Welding Parameters ◽  
Manufacturing Cost ◽  
New Approach ◽  
Aa6061 Alloy

The present investigation was mainly concerned with characteristics of autogeneous laser butt welding of 2 mm thickness nonheat treatableAA5052-H12,AA5083-H12 and 2 mm, 3 mm thickness heat treatableAA6061-T6aluminum alloys. The effect of laser welding parameters, surface cleaning, filler wire addition, and backing strip on quality of laser welded joints was clarified using 5 kW laser machine. It was found that all the investigated alloys showed tendencies for porosity and solidification cracking, particularly, at high welding speed (4 m/min). Porosity was prevented by accurate cleaning of the base metal prior to welding and optimizing the flow rate of argon shielding gas. Solidification cracking was avoided through two different approaches. The first one is based on the addition of filler metal as reported in other research works. The other new approach is concerned with autogeneous welding using a backing strip from the same base metal, and this could be applicable in production. Preventing solidification cracking in both cases was related mainly to a considerable decrease in the stress concentration at the weld metal center as a result of improving the fusion zone profile. The implementation of the new approach could help in producing weldments with a better quality due to the absence of the filler metal, which is known as a source for hydrogen-related porosity. It can also have a positive economic aspect concerning the manufacturing cost since welding is done without the addition of filler metal. Not only quality and economic positive aspects could be achieved, but also high productivity is another feature since high quality autogeneous weldments were produced with high welding speed, 6 m/min. Hardness measurements and tensile test of AA6061 alloy welds indicated a remarkable softening of the fusion zone due to dissolution of the strengthening precipitates, and this was recovered by aging treatment after welding. For alloys AA5052 and AA5083, softening of the fusion zone due to the loss of its work-hardened condition was much less in comparison with AA6061 alloy.

scholarly journals Study of Laser Welding of HCT600X Dual Phase Steels

2014 ◽  
Vol 22 (1) ◽  
pp. 93-98
Author(s):  
Pavol Švec ◽  
Viliam Hrnčiar ◽  
Alexander Schrek
Keyword(s):  
Tensile Strength ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Welding Process ◽  
Beam Power ◽  
Welding Parameters ◽  
Dual Phase ◽  
Welded Steel ◽  
Steel Sheets

AbstractThe effects of beam power and welding speed on microstructure, microhardnes and tensile strength of HCT600X laser welded steel sheets were evaluated. The welding parameters influenced both the width and the microstructure of the fusion zone and heat affected zone. The welding process has no effect on tensile strength of joints which achieved the strength of base metal and all joints fractured in the base metal.

Effect of base metal and welding speed on fusion zone microstructure and HAZ hot-cracking of electron-beam welded Inconel 718

2016 ◽  
Vol 89 ◽  
pp. 964-977 ◽  
Author(s):  
Yunpeng Mei ◽  
Yongchang Liu ◽  
Chenxi Liu ◽  
Chong Li ◽  
Liming Yu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Fusion Zone ◽  
Base Metal ◽  
Welding Speed ◽  
Inconel 718 ◽  
Hot Cracking ◽  
Zone Microstructure

Experimental Investigation of Welding Parameters on Automatic TIG Welding of Aluminium 5083 Plate

2016 ◽  
Vol 879 ◽  
pp. 1459-1464
Author(s):  
V.V. Praveen ◽  
T.D. John ◽  
K.M. Peethambaran
Keyword(s):  
Tensile Strength ◽  
Base Metal ◽  
Welding Speed ◽  
Weld Zone ◽  
Specific Effect ◽  
Tig Welding ◽  
Weld Strength ◽  
Welding Parameters ◽  
Width Ratio ◽  
Utility Concept

To improve the weld quality of AA 5083 plate using AA 5356 filler rod, an automatic TIG welding system is developed, by which welding speed can be controlled and a uniform speed is obtained. Welding of aluminium 5083 plate is carried out for different welding currents and welding speeds. In this work, the effect of welding speed and current on, the tensile strength of the weld, hardness at the three different zones viz. weld metal, HAZ and base metal are investigated. The temperature is measured at the HAZ and base metal. The hardness and temperature on the weld zone and the base metal are greatly influenced by the welding speed and current. It is found that the weld strength is influenced by different values of weld current and speed, but sometimes with high current, welding speed has no specific effect on the tensile strength of the weld. The effect of material deposition rate on the weld strength in uniform welding is studied. The weld thickness to width ratio is an important aspect in the analysis of weld strength. The values obtained for current and speed are taken for optimizing the strength and hardness, using Taguchi method and utility concept.

The Influence of Gas Tungsten Arc Welding Parameters on Mechanical and Microstructure Properties of the TC4 Titanium Alloy

2019 ◽  
Vol 969 ◽  
pp. 895-900 ◽  
Author(s):  
Muralimohan Cheepu ◽  
D. Venkateswarlu ◽  
P. Nageswara Rao ◽  
S. Senthil Kumaran ◽  
Narayanan Srinivasan
Keyword(s):  
Titanium Alloy ◽  
Fusion Zone ◽  
Welding Speed ◽  
Welding Parameters ◽  
Bead Geometry ◽  
Box Behnken Design ◽  
Gas Tungsten Arc ◽  
Tc4 Titanium Alloy ◽  
Gas Tungsten ◽  
Zone Microstructure

In the present study, TC4 titanium alloy was gas tungsten arc welded to evaluate the mechanical and metallurgical properties of the welds. The welds were carried out at different welding conditions such as welding speed and current to identify their effect on microstructural changes and strength of the welds. The results of bead geometry measurements suggests that the fusion zone width and depth was greatly varying with the welding speed and current. It is also observed that the fusion zone microstructure and heat affected zones are greatly controlled by welding conditions. Therefore the mechanical properties of the welds were improved with the changes in welding conditions and are correlated with the metallurgical features of the welds. The optimal welding conditions were analysed using Box-Behnken design and analysis of variance technique for identifying strength of the welds and better bead geometry parameters.

Dissimilar Metals Welding of CP Titanium to 304 Stainless Steel Using GTAW Process

2016 ◽  
Vol 848 ◽  
pp. 43-47 ◽  
Author(s):  
Thanaporn Thonondaeng ◽  
Kittichai Fakpan ◽  
Krittee Eidhed
Keyword(s):  
Stainless Steel ◽  
Weld Metal ◽  
Base Metal ◽  
Filler Metal ◽  
304 Stainless Steel ◽  
Welding Parameters ◽  
Dissimilar Metals ◽  
Metal Interface ◽  
Steel Base ◽  
Gtaw Process

This study involves V-groove butt welding of CP Titanium to 304 stainless steel by the gas tungsten arc welding (GTAW) process without and with buttering layer at the 304 stainless steel base metal. ERCuSn-A and ERNiCu-7 were chosen as a filler metals. Investigations including visual testing (VT), microhardness testing and metallurgical analysis were carried out by means of variable welding parameters. The experimental results showed that using the ERCuSn-A filler metal without and with buttering layer, any surface defect was not observed in the dissimilar metals welded specimen but an underbead crack was found at weld metal adjacent to the Ti/weld metal interface. Using the ERNiCu-7 filler metal without buttering layer, linear porosity was observed at weldment. However, using ERNiCu-7 filler metal with buttering layer, defect-free welded specimen could be achieved. The results of EDS analysis indicated that at Ti/weld metal interface, Ti diffused from the Ti base metal to the weld metal. At 304 stainless steel/weld metal interface, Fe, Ni and Cr diffused from the 304 stainless steel base metal to the weld metal.

The Effect of Welding Speed on Mg/Al Dissimilar Stirring Brazing

2014 ◽  
Vol 900 ◽  
pp. 639-642
Author(s):  
Hui Bin Sun ◽  
Hong You Chen ◽  
Song Tang ◽  
Lei Luo ◽  
Hui Bin Xu
Keyword(s):  
Shear Strength ◽  
Metal Surface ◽  
Base Metal ◽  
Welding Speed ◽  
Filler Metal ◽  
Oxide Films ◽  
Mg Alloy ◽  
Al Alloy ◽  
Imcs Layer ◽  
Mechanical Stirring

In this study, 2024 Al alloy and AZ31B Mg alloy were brazing with mechanical stirring. The effects of brazing speed on microstructure and shear strength were investigated. The results show that oxide films on Al base metal surface broken completely at lower brazing speed. The continuous IMCs layer was broken into thinner one and blocky IMCs distribution in filler metal more evenly at lower brazing speed. The shear strength value near Al and Mg interface up to 53.1Mpa and 41.5Mpa respectively.

scholarly journals Laser Butt Welding of Thin Ti6Al4V Sheets: Effects of Welding Parameters

2021 ◽  
Vol 5 (9) ◽  
pp. 246
Author(s):  
Peter Omoniyi ◽  
Rasheedat Mahamood ◽  
Nana Arthur ◽  
Sisa Pityana ◽  
Samuel Skhosane ◽  
...  
Keyword(s):  
Fusion Zone ◽  
Base Metal ◽  
Cost Effective ◽  
Tensile Tests ◽  
Vital Role ◽  
Manufacturing Industries ◽  
Welding Parameters ◽  
Butt Welding ◽  
Α Phase ◽  
Microhardness And Microstructure

Titanium and its alloys, particularly Ti6Al4V, which is widely utilized in the marine and aerospace industries, have played a vital role in different manufacturing industries. An efficient and cost-effective way of joining this metal is by laser welding. The effect of laser power and welding speed on the tensile, microhardness, and microstructure of Ti6Al4V alloy is investigated in this paper. Results show that the microhardness is highest at the fusion zone and reduces towards the base metal. The microstructure at the fusion zone shows a transformed needle-like lamellar α phase, with a martensitic α’ phase observed within the heat affected zone. Results of tensile tests show an improved tensile strength compared to the base metal.

scholarly journals Microstructure and mechanical properties of GTAW welded joints of AA6105 aluminum alloy

2016 ◽  
Vol 25 (43) ◽  
pp. 7-19 ◽  
Author(s):  
Minerva Dorta-Almenara ◽  
María Cristina Capace
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Heat Input ◽  
Cold Work ◽  
Dendritic Morphology ◽  
Welding Parameters ◽  
Microstructure And Mechanical Properties

Gas Tungsten Arc Welding (GTAW) is one of the most used methods to weld aluminum. This work investigates the influence of welding parameters on the microstructure and mechanical properties of GTAW welded AA6105 aluminum alloy joints. AA6105 alloy plates with different percent values of cold work were joined by GTAW, using various combinations of welding current and speed. The fusion zone, in which the effects of cold work have disappeared, and the heat affected zone of the welded samples were examined under optical and scanning electron microscopes, additionally, mechanical tests and measures of Vickers microhardness were performed. Results showed dendritic morphology with solute micro- and macrosegregation in the fusion zone, which is favored by the constitutional supercooling when heat input increases. When heat input increased and welding speed increased or remained constant, greater segregation was obtained, whereas welding speed decrease produced a coarser microstructure. In the heat affected zone recrystallization, dissolution, and coarsening of precipitates occurred, which led to variations in hardness and strength.

INVESTIGATION OF PULSE FREQUENCY ON FUSION ZONE CHARACTERISTICS OF GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Subravel V
Keyword(s):  
Magnesium Alloy ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Welding Speed ◽  
Pulse Frequency ◽  
Pulsed Current ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Different Levels

In this investigation an attempt has been made to study the effect of welding on fusion characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of welding speed (105 mm/min –145 mm/min). From this investigation, it is found that the joints fabricated using a welding speed of 135 mm/min yielded superior tensile properties compared to other joints. The formation of finer grains and higher hardness in fusion zone and uniformly distributed precipitates are the main reasons for the higher tensile properties of these joints

scholarly journals Analysis of the Microstructure and Mechanical Properties of TiBw/Ti-6Al-4V Ti Matrix Composite Joint Fabricated Using TiCuNiZr Amorphous Brazing Filler Metal

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 875
Author(s):  
Hao Tian ◽  
Jianchao He ◽  
Jinbao Hou ◽  
Yanlong Lv
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Matrix Composite ◽  
Room Temperature ◽  
Filler Metal ◽  
Ceramic Fiber ◽  
Tensile Fracture ◽  
Alloy Matrix ◽  
Composite Joint ◽  
Secondary Cracks

TiB crystal whiskers (TiBw) can be synthesized in situ in Ti alloy matrix through powder metallurgy for the preparation of a new type of ceramic fiber-reinforced Ti matrix composite (TMC) TiBw/Ti-6Al-4V. In the TiBw/Ti-6Al-4V TMC, the reinforced phase/matrix interface is clean and has superior comprehensive mechanical properties, but its machinability is degraded. Hence, the bonding of reliable materials is important. To further optimize the TiBw/Ti-6Al-4V brazing technology and determine the relationship between the microstructure and tensile property of the brazed joint, results demonstrate that the elements of brazing filler metal are under sufficient and uniform diffusion, the microstructure is the typical Widmanstätten structure, and fine granular compounds in β phase are observed. The average tensile strength of the brazing specimen is 998 MPa under room temperature, which is 97.3% of that of the base metal. During the high-temperature (400 °C) tensile process, a fracture occurred at the base metal of the highest tensile test specimen with strength reaching 689 MPa, and the tensile fracture involved a combination of intergranular and transgranular modes at both room temperature and 400 °C. The fracture surface has dimples, secondary cracks are generated by the fracture of TiB whiskers, and large holes form when whole TiB whiskers are removed. The proposed algorithm provides evidence for promoting the application of TiBw/Ti-6Al-4V TMCs in practical production.

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