Effects of Ar-He shielding gas mixture on mechanical and metallurgical properties of weld metal in laser welding of 6061 T6 aluminium alloy

2021 ◽  
Vol 33 (4) ◽  
pp. 042011
Author(s):  
Emine Gündoğdu İş ◽  
Muharrem Yılmaz
Keyword(s):  
Laser Welding ◽  
Weld Metal ◽  
Aluminium Alloy ◽  
Gas Mixture ◽  
Shielding Gas ◽  
Metallurgical Properties

Laser Welding of SSM Cast A356 Aluminium Alloy Processed with CSIR-Rheo Technology

2006 ◽  
Vol 116-117 ◽  
pp. 173-176 ◽  
Author(s):  
R. Akhter ◽  
L. Ivanchev ◽  
C. Van Rooyen ◽  
P. Kazadi ◽  
H.P. Burger
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Weld Metal ◽  
Aluminium Alloy ◽  
Nd:Yag Laser ◽  
Dendrite Structure ◽  
Weld Microstructure ◽  
Semi Solid ◽  
A356 Aluminium Alloy ◽  
Fine Dendrite

Samples of aluminium alloy A356 were manufactured by Semi Solid Metals HPDC technology, developed recently in CSIR-Pretoria. They were butt welded in as cast conditions using an Nd:YAG laser. The base metal and weld microstructure were presented. The effect of different heat treatments on microstructure and mechanical properties of the welds were investigated. It was found that the fine dendrite structure of the weld metal contributed for equalizing the mechanical properties of the joint.

scholarly journals Shielding Gas Influence On AA5086 Welded Joints: Residual Stresses Analysis, Microstructural Characterisation and Mechanical Properties

2021 ◽  
Author(s):  
Maria Cindra Fonseca ◽  
Marcos Caetano Melado ◽  
Marcel Souza ◽  
Cássio Barbosa
Keyword(s):  
Residual Stresses ◽  
Weld Metal ◽  
Base Metal ◽  
Welded Joints ◽  
Gas Mixture ◽  
Shielding Gas ◽  
Pure Argon ◽  
Gas Tungsten Arc ◽  
Microstructural Characterisation ◽  
Mechanical And Microstructural Properties

Abstract Samples of AA5086 aluminium alloy were welded by gas tungsten arc welding (GTAW) with alternating current using three different shielding gases. The samples were welded with pure argon (Ar), a mixture of argon and helium (Ar + He) and a new mixture composed of argon, nitrous oxide and oxygen (Ar + N2O + O2). The effect of the shielding gas on the residual stresses and on the mechanical and microstructural properties of the welded joints was evaluated and compared with the base metal. The new gas mixture produced compressive residual stresses in the longitudinal and transverse directions in the weld metal. Tensile test of welded joints indicated similar values for yield strength and ultimate tensile strength; however, these values were lower compared to the base metal. The new gas mixture provided a welded joint with hardness values in the weld metal and heat affected zone close to the base metal values and with greater magnitude compared to samples welded using pure argon and mixture of argon and helium. Microstructural characterisation performed by optical and scanning electron microscopy showed that the new mixture produced welded joints with lower porosity.

scholarly journals Effect of Shielding Gas on Microstructures and Mechanical Properties of TC4 Titanium Alloy Ultranarrow Gap Welded Joint by Laser Welding with Filler Wire

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Naiwen Fang ◽  
Erjun Guo ◽  
Kai Xu ◽  
Ruisheng Huang ◽  
Yiming Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Grain Boundary ◽  
Laser Welding ◽  
Weld Metal ◽  
Welded Joint ◽  
Filler Wire ◽  
Shielding Gas ◽  
Weld Microstructure ◽  
Tc4 Titanium Alloy

A 20 mm thick TC4 titanium alloy plate was welded by ultranarrow gap laser welding with filler wire with Ar and He as shielding gas, respectively. A characterization analysis of the microstructures and mechanical properties of the welded joint was conducted with OM, SEM, XRD, and EBSD and through the microhardness test and tensile test. The results showed that HAZ of the welded joint formed with Ar as shielding gas was much wider than that with He, and weld microstructure composition with the two shielding gases was basically consistent; phase boundary of the weld metal obtained with Ar was clearer, with a larger misorientation between the laths; α′ martensite lath in weld metal prepared with He showed obvious preferred orientation distribution, and α′ martensite microstructure was much finer; the misorientation of α′ phase grain boundary of weld microstructure prepared with Ar was slightly less distributed in high angle grain boundary than that with He; tensile property of the welded joint prepared with He was better than that with Ar; the hardness of each zone of welded joint prepared with He was less fluctuated and the hardness value measured was slightly higher than that with Ar.

Effect of shielding gas on the plasma plume in pulsed laser welding

Measurement ◽  
2019 ◽  
Vol 134 ◽  
pp. 25-32 ◽  
Author(s):  
Jie Xu ◽  
Yi Luo ◽  
Liang Zhu ◽  
Jingtao Han ◽  
Chengyang Zhang ◽  
...  
Keyword(s):  
Laser Welding ◽  
Plasma Plume ◽  
Pulsed Laser ◽  
Shielding Gas ◽  
Pulsed Laser Welding

The relation between liquation and solidification cracks in pulsed laser welding of 2024 aluminium alloy

2009 ◽  
Vol 519 (1-2) ◽  
pp. 167-171 ◽  
Author(s):  
F. Malek Ghaini ◽  
M. Sheikhi ◽  
M.J. Torkamany ◽  
J. Sabbaghzadeh
Keyword(s):  
Laser Welding ◽  
Aluminium Alloy ◽  
Pulsed Laser ◽  
Pulsed Laser Welding ◽  
Solidification Cracks

Influence of CO2-Ar Mixtures as Shielding Gas on Laser Welding of Al-Mg Alloys

2013 ◽  
Vol 44 (13) ◽  
pp. 5711-5723 ◽  
Author(s):  
Zouhair Boukha ◽  
José María Sánchez-Amaya ◽  
Leandro González-Rovira ◽  
Eloy Del Rio ◽  
Ginesa Blanco ◽  
...  
Keyword(s):  
Laser Welding ◽  
Mg Alloys ◽  
Shielding Gas ◽  
Al Mg Alloys

scholarly journals Peculiarities of alloying of weld metal of high-strength aluminium alloy welded joints with scandium

2014 ◽  
Vol 2014 (5) ◽  
pp. 28-32 ◽  
Author(s):  
V.E. Fedorchuk ◽  
◽  
O.S. Kushnaryova ◽  
T.A. Alekseenko ◽  
Yu.V. Falchenko ◽  
...  
Keyword(s):  
Weld Metal ◽  
Aluminium Alloy ◽  
Welded Joints ◽  
High Strength
Sign in / Sign up

Export Citation Format

Share Document