Effect of Vibratory Treatment on Hot Cracking Resistance in AA6061 Alloy

2012 ◽  
Vol 584 ◽  
pp. 516-520 ◽  
Author(s):  
Kaliyaperumal Balasubramanian ◽  
V. Balusamy
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Hot Cracking ◽  
Fusion Welding ◽  
Test Results ◽  
Frequency Range ◽  
Alloy Specimen ◽  
Gas Tungsten Arc ◽  
Aa6061 Alloy ◽  
Cracking Tendency

AA6061 alloy is most widely used in aircraft fittings, marines fitting and automobile industries. This alloy can be joined by fusion welding process like Gas Tungsten Arc Welding (GTAW). An important metallurgical difficulty in arc welding of this alloy is hot cracking. As the name indicates, this kind of cracking occurs while the metal is still hot. It usually occurs in the fusion zone during solidification. The main aim of this work is to investigate the effect of vibratory treatment on hot cracking of AA6061 alloy. Houldcroft hot cracking test is used to determine the hot cracking tendency. Weld bead was made on AA6061 alloy specimen in the presence and absence of vibratory treatment. Vibratory treatment was carried out in the frequency range of 250 Hz to 900 Hz. Weldments made with and without vibratory treatment were compared using hot cracking tests. Test results show that by applying vibratory treatment, hot cracking can be largely controlled in AA6061 alloy.

scholarly journals Residual stresses in gas tungsten arc welding: a novel phase-field thermo-elastoplasticity modeling and parameter treatment framework

2021 ◽  
Author(s):  
Baharin Ali ◽  
Yousef Heider ◽  
Bernd Markert
Keyword(s):  
Residual Stresses ◽  
Phase Field ◽  
Arc Welding ◽  
Welding Process ◽  
Gas Tungsten Arc Welding ◽  
Fusion Welding ◽  
Isotropic Hardening ◽  
Melting Front ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

AbstractThe fusion welding process of metallic components, such as using gas tungsten arc welding (GTAW), is often accompanied by detrimental deformations and residual stresses, which affect the strength and functionality of these components. In this work, a phase-field model, usually used to track the states of phase-change materials, is embedded in a thermo-elastoplastic finite element model to simulate the GTAW process and estimate the residual stresses. This embedment allows to track the moving melting front of the metallic material induced by the welding heat source and, thus, splits the domain into soft and hard solid regions with a diffusive interface between them. Additionally, temperature- and phase-field-dependent material properties are considered. The J2 plasticity model with isotropic hardening is considered. The coupled system of equations is solved in the FE package FEniCS, whereas two- and three-dimensional initial-boundary-value problems are introduced and the results are compared with reference data from the literature.

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