Influence of Post Weld Heat Treatment on Strength of Three Aluminum Alloys Used in Light Poles

Menzemer, Craig C.; Hilty, Eric; Morrison, Shane D; Minor, Ray; Srivatsan, T. S.

doi:10.3390/met6030052

Cited by 8 publications

(3 citation statements)

References 8 publications

(10 reference statements)

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“…Likewise, Elangovan and Balasubramanian 39 showed that the appropriate PWHT in AA6061 welded joints increased the joint efficiency from 66% for the AW condition to approximately 77%. Menzemer et al 40 also reported the increase of the yield stress and of the ultimate tensile strength in welded joints from three differen aluminum alloys from 6xxx alloying series with the appropriate artificial aging conditions.…”

Section: Results and Disussionmentioning

confidence: 97%

Fatigue and fracture toughness of electron beam welded joints of aluminum alloy 6156 (Al–Mg–Si) for aerospace applications

Alexopoulos

Examilioti

Stergiou

et al. 2021

Fatigue Fract Eng Mat Struct

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The mechanical behavior of AA6156 electron beam welded joints and the effect of artificial aging heat treatments on the fracture‐related properties were investigated. The fatigue test results of the welded joints presented lower fatigue endurance limit by approximately 60%, when compared to the base material. Fracture resistance results showed that the critical stress intensity factor (Kcr) was essentially decreased (~32%) in the as‐welded condition. Heat treatment before welding presented a 15% increase in Kcr for 4 h of artificial aging, while a decrease in Kcr was noticed for prolonged isothermal heat treatment prior to welding. By applying post welding heat treatments, all investigated isothermal heat treatment conditions resulted in decreasing Kcr. Tensile test results of the welded joints showed that an almost 40% increase of the yield stress can be achieved with appropriate post welding heat treatment, on the expense of only 10% decrease in Kcr.

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Section: Results and Disussionmentioning

confidence: 97%

Fatigue and fracture toughness of electron beam welded joints of aluminum alloy 6156 (Al–Mg–Si) for aerospace applications

Alexopoulos

Examilioti

Stergiou

et al. 2021

Fatigue Fract Eng Mat Struct

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show abstract

“…As can be seen in Figure 5b, the crack seems to be propagated at the boundary between these two patterns. In the literature, these features are often associated to a forged weld between two pieces characterized by dissimilar compositions (L' Hèritier et al 2013, Menzemer et al 2016.…”

Section: Microstructurementioning

confidence: 99%

A Multidisciplinary Strategy for the Inspection of Historical Metallic Tie-Rods: The Milan Cathedral Case Study

Bellanova

Felicetti

2019

International Journal of Architectural Heritage

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A reliable assessment of historical metallic tie-rods requires both the estimation of actual tensile load and the identification of dominant defects. Despite of high defectiveness resulting from traditional metalworking techniques, so far the latter aspect has not been duly addressed in the literature. In this paper, several methodologies are discussed aimed at integrating the usual inspection practice. All studies were performed on the tie-rods of Milan Cathedral.Metallurgical analyses allowed to recognize the main features of the material. Mechanical characterization in the perspective of Elasto-Plastic Fracture Mechanics (EPFM) indicated the conditions for crack propagation. Several Non-Destructive Techniques (NDTs) commonly used in Mechanical Engineering (i.e. guided waves, eddy currents, pulsed active thermography) were examined and adapted to this unconventional application. Based on the combination of all the mentioned methods, a multidisciplinary procedure was defined, which allows the evaluation of the crack significance with reference to the estimated working stress.

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“…Different post-weld heat treatment (PWHT) techniques are usually applied to improve the mechanical performances of welded joints of heat-treatable aluminum alloys. A number of research studies have investigated the application of PWHT to different aluminum alloy welded joints using various welding processes [15][16][17][18]. Balasubramanian et al [19] researched the effect of pulsed current and PWHT on the tensile properties of TIG welded and metal inert gas (MIG) welded high-strength aluminum alloys; they noted that more precipitates were formed after a soaking period of 24 h at 125 • C, and their uniform distribution led to a higher strength and hardness.…”

Section: Introductionmentioning

confidence: 99%

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

Wang

Xue

et al. 2017

Metals

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Abstract:Various heat input conditions and post-weld heat treatments were adopted to investigate the microstructure evolution and mechanical properties of tungsten inert gas (TIG) welded joints of AA6082-T6 with porosity defects. The results show that the fracture location is uncertain when an as-welded joint has porosities in the weld zone (WZ), and overaging in the heat-affected zone (HAZ) at the same time. When the fracture of the as-welded joint occurs in the HAZ, the total heat input has a linear relation with the tensile strength of the joint. An excess heat input induces the overgrowth of Mg 2 Si precipitates in HAZ and the coarsening of α-Al grains in WZ, resulting in a decrease in the microhardness of the corresponding areas. After artificial aging treatment, the tensile strength of the welded joint is increased by approximately 9-13% as compared to that of as-welded joint, and fracture also occurs in HAZ. In contrast, for solution treated and artificial aging treated joint, fracture occurs suddenly at the rising phase of the tensile curve due to porosity defects throughout the weld metal. Furthermore, the eutectic Si particles of WZ coarsen and spheroidize after solution treatment and artificial aging treatment, due to the diffusion of Si to the surface of the original Si phases when soaking at high temperature.

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Influence of Post Weld Heat Treatment on Strength of Three Aluminum Alloys Used in Light Poles

Cited by 8 publications

References 8 publications

Fatigue and fracture toughness of electron beam welded joints of aluminum alloy 6156 (Al–Mg–Si) for aerospace applications

Fatigue and fracture toughness of electron beam welded joints of aluminum alloy 6156 (Al–Mg–Si) for aerospace applications

A Multidisciplinary Strategy for the Inspection of Historical Metallic Tie-Rods: The Milan Cathedral Case Study

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

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