Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

Basmaci, Ayse Nihan; Filiz, Seckin; Şahin, Mümin

doi:10.3390/app10113908

Cited by 9 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To strengthen this approach a comparison is made between arc welding and friction welding. The results revealed the improved grain structure in joints made with friction welding process (Basmaci et al, 2020). Some researchers (Rao et al, 2013) were previously proved the vibration inclusion during the process of welding can enhance the mechanical properties of the mated materials.…”

Section: Prefacementioning

confidence: 85%

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

Bade

Rao

Rao³

2020

WJE

View full text Add to dashboard Cite

Purpose The purpose of this paper is to investigate the prominence of mechanical excitations at the time of welding. In the past years, the process of welding technology has expanded its influence in manufacturing. The crucial drawback of conventional welding is prompted by internal stresses and distortions, which is the focal reason for weld defects. These weld defects can be diminished by the process called post-weld heat treatment (PWHT), which consumes more working hours and needs skilled workers. To replace these PWHT processes, mechanical vibrations are introduced during the process of welding to diminish these weld defects. Design/methodology/approach In the current research, the mechanical vibrations are transferred to weld-pool through vibro-motor and DC motor connected to the electrode. As per standards, the tensile test specimens were prepared for welding with different voltages of vibro-motor and DC motor respectively. The weld joints were tested for tensile strength and analyzed the microstructure at the fusion zone. Findings Melt-ability at fusion zone of 1018 mild steel was investigated by the single-stroke intense heat process of fusion welding. It is observed that the mechanical vibrations technique has a profound influence on the enhancement of the fusion zone characteristics and grain structure. The peak value of the tensile strength is observed at 100 s of vibration, 190 V of vibro-motor voltage and 18 V of electrode voltage. The tensile strength of the welded joints with vibrations is increased up to 22.64% when it is compared with conventional welding. The enhancement of the tensile strength of the weld bead was obtained because of the formation of fine grain structure. So, mechanical vibrations are identified as the most convenient method for improving the mild steel alloys weld quality. Originality/value A novel approach called mechanical vibrations during the process of welding is implemented for fusion zone refinement.

show abstract

Section: Prefacementioning

confidence: 85%

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

Bade

Rao

Rao³

2020

WJE

View full text Add to dashboard Cite

show abstract

“…In this case, functional gradient structures and even functional gradient nanostructures emerge, and have been successfully designed and prepared. [40][41][42][43] The functional gradient nanostructure has the dual characteristics of functional gradient structures and nanomaterials, and it is one of the research hotspots in recent years. 44,45 Considering that the thickness of components in nanorobots or other equipment is very thin, say generally in the order of less than ten nanometers, which is far less than the length and width, but the width is not significantly less than the length, so it is more general to simplify the key components of nanorobots into plate-like nanostructures rather than nanobeams.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration of Axially Moving Functionally Graded Nanoplates Based on the Nonlocal Strain Gradient Theory

Li¹,

Wang²,

Luo³

et al. 2020

The International Journal of Acoustics and Vibration

View full text Add to dashboard Cite

Using the nonlocal strain gradient theory, we explore vibration behaviours of initially bidirectional tensioned functionally graded nanoplates with axial speed. The governing equation of motion can be obtained based on the differential type of nonlocal strain gradient constitutive relation, which characters the dynamics of nanostructures containing kinematic relation. The simply supported boundary constraints on four sides are considered and subsequently the numerical results are determined. It shows that natural frequencies of axially moving nanoplates decrease when increasing the axial speed and the nonlocal parameter. Hence the nonlocal and kinematic factors cause the natural frequencies to decrease or, weaken the equivalent bending rigidity. On the other hand, natural frequencies increase with an increase in the axial tension and material characteristic scale. Hence the strain gradient and tensile stress factors cause the natural frequencies to increase or, strengthen the equivalent bending rigidity. In addition, the natural frequencies get higher with a larger aspect ratio of the functionally graded nanoplate. The larger one between the nonlocal parameter and the material characteristic scale plays a dominant role in the softening and stiffening mechanisms of the nonlocal strain gradient effect. In case of the same magnitude of the nonlocal parameter and the material characteristic scale, the softening and hardening phenomena disappear. The equivalent bending rigidity neither increases nor decreases in such a situation, and its value degenerates to the classical one.

show abstract

“…They utilized the Gaussian heat source model. Some researchers investigated especially the HAZ after welding (Waghmare et al, 2019;Dittrich et al, 2019;Basmaci et al, 2020;Cabrilo and Geric, 2018). HAZ is a very important region of the weldment since it is the weakest part of the weldment.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the residual stresses and deformations during the autogenous GTAW process

Savaş

2020

WJE

View full text Add to dashboard Cite

Purpose The gas tungsten arc welding (GTAW) process is a widely used process that produces quality weldments. But the high heat generation from the GTAW arc can cause extreme temperatures as high as 20,000°C. The residual stresses and deformations are high accordingly. One of the methods for decreasing residual stresses and deformations is to change the welding pattern. In the literature, there are not so many examples of modeling dealing with welding patterns. This paper aims to investigate the influence of welding patterns on the deformations. Design/methodology/approach In this work, back-stepping patterns and partitioning of the weld line were investigated and the distortions and residual stresses were calculated. By doing this, temperature-dependent thermophysical and thermo-mechanical material properties were used. The temperature distribution and deformation from experiments with the same welding conditions were used for validation purposes. Findings Seven different welding patterns were analyzed. There is only one pattern with a single partition. There are three patterns investigated for both two and three partitioned weldings. The minimum deformation and the optimum residual stress combination is obtained for the last pattern, which is a three partitioned and diverging pattern. Originality/value The most important aspect of this paper is that it deals with welding patterns, which is not much studied beforehand. The other important thing is that the structural part and the thermal part of the simulation were coupled mutually and validated according to experiments.

show abstract

Experimental Analysis of Welded Rods with a Functionally Graded Material Approach

Cited by 9 publications

References 45 publications

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

Free Vibration of Axially Moving Functionally Graded Nanoplates Based on the Nonlocal Strain Gradient Theory

Analysis of the residual stresses and deformations during the autogenous GTAW process

Contact Info

Product

Resources

About