Vacuum-Free Stirring Brazing of SiCP/A356 Composites and Aluminum Alloy Using Semisolid Filler Metal with Low Solid Fraction

This paper explores the brazing process of SiCp/A356 composites and aluminum alloy using semisolid metal. The two substrates were heated up to the semisolid temperature range of Zn-Al filler metal in the joint region by a resistance heating plate. In order to mix the filler metal with the base metal of both sides to be a single uniform joint, a stirrer was introduced into the weld seam. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be local joined with semi-solid filler metal. It can be found that part of the oxide film on the interface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds can be formed between the filler metal and the base materials. Moreover, the oxide film of surface of aluminum alloy disrupted and removed was easier than that of surface of composites with existing of Sic particle. The joint microstructure with globular α-Al grain enclosed by rich-Zn phase can be obtained after stirring brazing.

Download Full-text

Semi-Solid Stirring Brazing of SiCp/A356 Composites and Aluminum Alloy in Air

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.3521 ◽

2011 ◽

Vol 189-193 ◽

pp. 3521-3524 ◽

Cited By ~ 1

Author(s):

Hui Bin Xu ◽

Quan Xiang Luo ◽

Chun Tian Li ◽

Chang Hua Du

Keyword(s):

Aluminum Alloy ◽

Oxide Film ◽

Weld Seam ◽

Filler Metal ◽

Joint Region ◽

Base Materials ◽

Semi Solid ◽

Micro Structures ◽

Two Sides ◽

Sic Particle

The semi-solid brazing process of SiCp/A356 composites and aluminum alloy was investigated. The two substrates were heated up to the semisolid temperature range of Zn-Al filler metal in the joint region by a resistance heating plate. At this point a stirrer was introduced into the weld seam in order to mix filler metal and the two sides of substrates into a single uniform joint. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be successfully joining with semi-solid filler metal. It can be found that most of the oxide film on the surface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds formed between the filler metal and the base materials. Moreover, the oxide film of surface of aluminum alloy was more thoroughly disrupted and removed than that of surface of composites with existing of Sic particle. The joint microstructure with globular α-Al grain enclosed by rich-Zn phase can be obtained after stirring brazing.

Download Full-text

Study of Brazeability of SiCP/A356 Composites and Aluminum Alloy Using Semisolid Metal with High Solid Fraction by Stirring

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.663 ◽

2011 ◽

Vol 239-242 ◽

pp. 663-666 ◽

Cited By ~ 2

Author(s):

Hui Bin Xu ◽

Quan Xiang Luo ◽

Jin Ying He ◽

Bo Fang Zhou ◽

You Liang Zeng ◽

...

Keyword(s):

Aluminum Alloy ◽

Oxide Film ◽

Base Metal ◽

Filler Metal ◽

2024 Aluminum Alloy ◽

Base Materials ◽

High Solid Fraction ◽

Semi Solid ◽

Micro Structures ◽

Semisolid Metal

The semi-solid brazing process of SiCp/A356 composites and 2024 aluminum alloy using Zn-Al eutectic filler metal at 450 °C has been investigated. The two substrates and Zn-Al filler metal were heated up to the semisolid temperature range of Zn-Al filler metal by a resistance heating plate. In order to mix the filler metal with the base metal of both sides to be a single uniform joint, a stirrer was introduced into the weld seam. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be joining by semisolid metal. It can be found that almost half of the oxide film on the surface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds formed between the filler metal and the base materials on the interface of oxide had been disrupted. Moreover, the oxide film of surface of aluminum alloy was more thoroughly disrupted and removed than that of surface of composites with existing of SiC particle.

Download Full-text

Study on Stirring Brazing of SiCp/A356 Composites with the Zn27Al Filler Alloy in Air

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.2710 ◽

2011 ◽

Vol 383-390 ◽

pp. 2710-2713

Author(s):

Hui Bin Xu ◽

Bo Fang Zhou ◽

Quan Xiang Luo ◽

You Liang Zeng ◽

Chang Hua Du

Keyword(s):

Tensile Strength ◽

Oxide Film ◽

Weld Seam ◽

Filler Metal ◽

Filler Alloy ◽

Resistance Heating ◽

Melt Temperature ◽

Micro Structures ◽

Two Sides ◽

Joining Process

The joining process of SiCp/A356 composites is investigated. The two substrates are heated up to the melt temperature of Zn27Al filler metal by a resistance heating plate. At the time, a stirrer is introduced into the liquid weld seam in order to mix filler metal and two sides of substrates into a single uniform joint. After stirring, specimens are sectioned for the analysis of macro- and micro-structures along the weld region. The research shows that two typical joint interfaces with oxide film and without one were found. So, oxide film on the substrate wasn’t completely disrupted during stirring brazing at 500°C.And, the tensile strength of joint is only 50MPa.

Download Full-text

Comparative Study on the Activity of GaF3 and Ga2O3 Nanoparticle-Doped CsF-AlF3 Flux for Brazing 6061 Al/Q235 Steel Joints

Crystals ◽

10.3390/cryst10060498 ◽

2020 ◽

Vol 10 (6) ◽

pp. 498 ◽

Cited By ~ 2

Author(s):

Zhen Yao ◽

Songbai Xue ◽

Junxiong Zhang

Keyword(s):

Aluminum Alloy ◽

Comparative Analysis ◽

Carbon Steel ◽

Base Metal ◽

Filler Metal ◽

Low Carbon Steel ◽

Low Carbon ◽

6061 Aluminum Alloy ◽

Steel Joints ◽

Molten Filler Metal

The effect of trace amounts of GaF3 and Ga2O3 nanoparticles on the wettability and spreadability of CsF-AlF3 flux matched Zn-15Al filler metal were comparatively studied on 6061 aluminum alloy and Q235 low-carbon steel. The experimental results indicate that appropriate amounts of GaF3 and Ga2O3 added into the flux could significantly promote the Zn-15Al filler metal to wet and spread on the surface of 6061 aluminum alloy and Q235 low-carbon steel. The optimum ranges for GaF3 and Ga2O3 were 0.0075–0.01wt.% and 0.009–0.01 wt.%, respectively. Comparative analysis showed that the activity of CsF-AlF3 flux bearing GaF3 was higher than that bearing Ga2O3. The reason for this is that the former flux has a stronger ability to remove oxides of the base metal and reduce the interfacial tension of the molten filler metal and the base metal.

Download Full-text

Semi-Solid State Joining of Aluminum Alloys under Nitrogen Shielding Gas

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.496-500.92 ◽

2014 ◽

Vol 496-500 ◽

pp. 92-95 ◽

Cited By ~ 1

Author(s):

Atsadawoot Geaowdee ◽

Prapas Muangjunburee ◽

Jessada Wannasin

Keyword(s):

Tensile Strength ◽

Aluminum Alloy ◽

Solid State ◽

Welding Speed ◽

Weld Seam ◽

Rotation Speed ◽

Shielding Gas ◽

Globular Structure ◽

Semi Solid ◽

Solid State Joining

The purpose of this research is to investigate the semi-solid state joining of SSM 356 aluminum alloy which welded at its semi-solid state by using oxygen - acetylene as a heat source. Then a stirrer was used to stir the weld seam. Joining was performed under nitrogen shielding gas. The parameters of this study were rotation speed at 1,110 and 1,320 rpm, welding speed at 120 and 160 mm/min, semi-solid state temperatures 575-590 and 590-610 oC. The results indicated that the weld's microstructure consisted of irregular globular structure. In addition, porosities were found at top of weld metal. The highest tensile strength and elongation were obtained from rotation speed at 1,110 rpm, welding speed at 120 mm/min and joining temperature at 575-590 oC.

Download Full-text

Semisolid Compression Brazing of Al50Si Alloy Using Zn-Al-Cu Filler Metal Assisted by SiC Particles

Advances in Materials Science and Engineering ◽

10.1155/2019/3275810 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10

Author(s):

Jing Xiao ◽

Shun Li ◽

Shuxin Bai ◽

Degan Xiong ◽

Yu Tang

Keyword(s):

Mechanical Properties ◽

Oxide Film ◽

Bonding Strength ◽

Filler Metal ◽

Strengthening Effect ◽

Metal Interface ◽

Sic Particles ◽

Particle Layer ◽

Dislocation Strengthening ◽

Sic Particle

Semisolid compression brazing of Al50Si alloy using Zn-Al-Cu filler metal assisted by SiC particles coating has been developed. The effects of the size and concentration of SiC particles on the microstructure and mechanical properties of the joints were studied. By using 1 μm SiC particles and the concentration of SiC particles increased to 3 g/m2, oxide film on the surface of base metal was completely disrupted and a good bonding strength was obtained. As SiC concentration further increased to 4 g/m2, colonies of SiC particle with nonwetting areas of filler metal formed at the interface, resulting in a decrease in the bonding strength. By using 5 μm SiC particles, the bonding strength was enhanced as SiC concentration increased from 1 g/m2 to 3 g/m2 due to the removal of the oxide film. By further increasing SiC concentration to 16 g/m2, the strength was constantly improved because of the dislocation strengthening effect generated at the SiC particle layer/filler metal interface. When SiC concentration increased to 32 g/m2, nonwetting area appeared inside the SiC particles layer, causing a decrease in the bonding strength.

Download Full-text

Investigation of Dissimilar Joint between 356 and 7075 of Semi-Solid (SSM) Aluminum Alloy by Friction Stir Welding

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.344 ◽

2014 ◽

Vol 931-932 ◽

pp. 344-348 ◽

Cited By ~ 1

Author(s):

Worapong Boonchouytan ◽

Jaknarin Chatthong ◽

Surasit Rawangwong ◽

Romadorn Romadorn ◽

Prapas Muangjunburee

Keyword(s):

Aluminum Alloy ◽

Base Metal ◽

Welding Speed ◽

Rotation Speed ◽

Tool Geometry ◽

Butt Joints ◽

Friction Stir ◽

Tool Rotation Speed ◽

Semi Solid ◽

Tool Rotation

The objective of this research was to investigate the effect of parameters on the microstructure and mechanical properties of friction stir welded butt joints of dissimilar aluminum alloy sheets between Semi-Solid Metal (SSM) 356 and 7075. The base metal of SSM 356 and 7075 was located on the advancing side and the retreating side, respectively. The cylindrical pin was used as the welding tool geometry. Friction stir welded using different tool rotation speed (710, 1000 and 1400 rpm) and welding speed (80, 112 and 160 mm/min). The result indicated that the maximum average tensile strength of 205.13 MPa was achieved for the joint produced at tool rotation speed 1000 rpm, welding speed 160 mm/min. In addition, the metallurgy and welding structures of combined two types aluminium showed more definite than the base metal.

Download Full-text

Analysis of the Microstructure and Mechanical Properties of TiBw/Ti-6Al-4V Ti Matrix Composite Joint Fabricated Using TiCuNiZr Amorphous Brazing Filler Metal

Materials ◽

10.3390/ma14040875 ◽

2021 ◽

Vol 14 (4) ◽

pp. 875

Author(s):

Hao Tian ◽

Jianchao He ◽

Jinbao Hou ◽

Yanlong Lv

Keyword(s):

Mechanical Properties ◽

Base Metal ◽

Matrix Composite ◽

Room Temperature ◽

Filler Metal ◽

Ceramic Fiber ◽

Tensile Fracture ◽

Alloy Matrix ◽

Composite Joint ◽

Secondary Cracks

TiB crystal whiskers (TiBw) can be synthesized in situ in Ti alloy matrix through powder metallurgy for the preparation of a new type of ceramic fiber-reinforced Ti matrix composite (TMC) TiBw/Ti-6Al-4V. In the TiBw/Ti-6Al-4V TMC, the reinforced phase/matrix interface is clean and has superior comprehensive mechanical properties, but its machinability is degraded. Hence, the bonding of reliable materials is important. To further optimize the TiBw/Ti-6Al-4V brazing technology and determine the relationship between the microstructure and tensile property of the brazed joint, results demonstrate that the elements of brazing filler metal are under sufficient and uniform diffusion, the microstructure is the typical Widmanstätten structure, and fine granular compounds in β phase are observed. The average tensile strength of the brazing specimen is 998 MPa under room temperature, which is 97.3% of that of the base metal. During the high-temperature (400 °C) tensile process, a fracture occurred at the base metal of the highest tensile test specimen with strength reaching 689 MPa, and the tensile fracture involved a combination of intergranular and transgranular modes at both room temperature and 400 °C. The fracture surface has dimples, secondary cracks are generated by the fracture of TiB whiskers, and large holes form when whole TiB whiskers are removed. The proposed algorithm provides evidence for promoting the application of TiBw/Ti-6Al-4V TMCs in practical production.

Download Full-text

Properties of a thick-section narrow-gap gas tungsten arc weld of cast Haynes 282

Welding in the World ◽

10.1007/s40194-021-01077-4 ◽

2021 ◽

Author(s):

Michael Santella ◽

X. Frank Chen ◽

Philip Maziasz ◽

Jason Rausch ◽

Jonathan Salkin

Keyword(s):

Base Metal ◽

Heat Affected Zone ◽

Reference Data ◽

Filler Metal ◽

Stress Rupture ◽

Narrow Gap ◽

Weld Deposit ◽

Gas Tungsten Arc ◽

Gas Tungsten ◽

Weld Heat

AbstractA 50.8-mm-deep gas tungsten arc weld was made with matching filler metal in cast Haynes 282 alloy. The narrow-gap joint was filled with 104 weld beads. Visual and dye-penetrant inspection of cross-weld specimens indicated that the cast base metal contained numerous casting defects. No visible indications of physical defects were found in the weld deposit. The weld heat-affected zone was characterized by microcracking and localized recrystallization. The cause of the cracking could not be determined. Hardness testing showed that a softened region in the as-welded heat-affected zone was nearly eliminated by post-weld heat treatment. Tensile testing up to 816 °C showed that cross-weld specimen strengths ranged from 57 to 79% of the cast base metal tensile strength. The stress-rupture strengths of cross-weld specimens are within 20% of base metal reference data. Failures of both tensile and stress-rupture specimens occurred in the base metal.

Download Full-text