The influence of processing parameters on the ultrasonic degassing of molten AlSi9Cu3 aluminium alloy

Puga, Hélder; Barbosa, J.; Seabra, Eurico; Ribeiro, S.; Prokic, M.

doi:10.1016/j.matlet.2009.01.009

Cited by 59 publications

(35 citation statements)

References 6 publications

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“…The degassing effect is mainly related to the ultrasonic power and melt temperature [12]. Owing to the excellent effect of ultrasound on the microstructure in the casting field, many scholars have tried to apply ultrasound in the course of TIG welding.…”

Section: Introductionmentioning

confidence: 99%

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Chen

Yang

et al. 2017

Metals

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Ultrasonic-assisted tungsten inert gas welding was carried out on a thin plate of 2195 Al-Li alloy, and the characteristics of the weld pores were analyzed in terms of their size and porosity. The effects of welding speed and ultrasonic power on the porosity and size of the pores were investigated. The pores were found to occur primarily adjacent to the surface of the weld. The porosity decreased and the size increased with a decrease in welding speed. The effect of ultrasonic power on the characteristics of the pores was different from that of the welding speed. The porosity and size of the pores decreased and then increased with an increase in ultrasonic power. A relationship was found between the transient cavitation intensity and the characteristics of pores. An increasing transient cavitation intensity results in a decrease in the porosity and size of pores when the transient cavitation intensity is lower. However, it can result in an increase in the porosity and pore size when the transient cavitation intensity further increases. Finally, the influencing mechanism of cavitation on welding pores was discussed.

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Section: Introductionmentioning

confidence: 99%

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Chen

Yang

et al. 2017

Metals

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“…In metal casting, the ultrasonic vibration (USV) provides multiple significant effects such as degassing [44][45][46][47], refining, and modifying the microstructures [48][49][50][51]. Using USV in brazing is an attractive assisting tool [37][38][39][52][53][54][55][56][57][58]; however, studying the combined effects of USV with the technological parameters of brazing process and developing a joint interface more compatible with the USV have not yet received an adequate attention.…”

Section: Introductionmentioning

confidence: 99%

Low‐Temperature Brazing of Titanium Using Al‐Based Filler Alloys

Muhrat

Puga

Barbosa

2018

Advances in Materials Science and Engineering

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Brazing of titanium using low melting temperature filler alloys is a preferred choice regarding cost and preserving its mechanical properties. However, brazing titanium at low temperature is still a challenge, especially regarding aluminum-based filler alloys. During the last years, several brazing methods and Al-based fillers were developed to meet industrial requirements; some of them might achieve some of those requirements. e use of ultrasound in brazing has gained increased attention recently, which helps to reduce the time and the necessity for a special brazing environment, subsequently, reducing cost and increasing applicability. Brazing titanium below the α↔β transformation temperature, using commercial and experimental Al-based fillers of different compositions, is presented in this review; including the procedures of traditional and ultrasound-assisted brazing methods. Correspondingly, the effects of brazing conditions and alloying elements on the mechanical properties and the intermetallic compounds formation are examined.

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“…Similar results were found by Haberl et al [35] who reported almost 50% reduction in number density of pores in RPT samples after degassing. Although it is well known that degassing reduces the hydrogen content, the main contribution of degassing is considered to be the floatation of bifilms to the melt surface [14,[44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

Uludağ

Çetin

Dışpınar

et al. 2017

Metals

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Abstract:The effects of degassing, holding time and melt additions (Sr, Sr + Ti, Ti, B and B + Sr) on the quality of A356 melts were examined. A total of 120 reduced pressure test samples were collected. Pores in these samples were analyzed via digital image processing to determine the number density of pores as well as the statistical distribution of their sizes. Results showed that in all cases, degassing with argon reduced the number of defects regardless of the additions made to the melts. Moreover, all additions were found to degrade melt quality. The lowest number density of pores in all melts was achieved in melts with no additions that were degassed. In both degassed and non-degassed melts, Sr additions degraded the melt quality significantly. The mechanisms of melt quality improvement or degradation with different melt treatments are discussed in the paper.

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The influence of processing parameters on the ultrasonic degassing of molten AlSi9Cu3 aluminium alloy

Cited by 59 publications

References 6 publications

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

Low‐Temperature Brazing of Titanium Using Al‐Based Filler Alloys

Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

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