Zhejiang Xinrui Welding Material Co.

Shanhu, China

Zhejiang Xinrui Welding Material Co.

Shanhu, China
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Dai W.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Jiang S.,Harbin Welding Institute | Lou J.,Zhejiang Xinrui Welding Material Co. | And 2 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

Two self-designed AlZnSi alloys were utilized to braze 6061Al alloy, the microstructures and mechanical properties of the joints were also studied. The results showed that the improved non-corrosive flux KCsAlF4 could effectively remove the oxide film on 6061 Al surface. Element Si exists as the plate type and needle type in both the filler metal and brazing seams. The needle type phase is much more obvious when the Si content is high, and the brittle phase could induce the stress concentration. However, the higher content of Si and Al is helpful to refine the grain size in the brazing seam. Both of the strength and gas tightness properties of 6061Al brazed joints are satisfactory, and the fracture shows intergranular fracture characterizes.


Zhang M.,Nanjing University of Aeronautics and Astronautics | Zhang M.,Huaiyin Institute of Technology | Xue S.,Nanjing University of Aeronautics and Astronautics | Ji F.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2011

Cu/Al dissimilar metals were brazed with Zn-Al filler metals by torch-brazing technology, and the effects of Al on the spreadability and microstructure of Zn-Al filler metal were investigated separately. Moreover, the strength and microstructure of the brazed joint were also studied. Results indicate that the strength of the brazed joints achieves the optimum status when the Al content of filler metals is 15%. SEM and EDS are used to study the microstructure and phase constitution of the filler metals and brazed joints respectively. Experimental results show the microstructures of brazed joints are mainly consisted of Zn-based solid solution when Al content is low. However, CuAl2 intermetallic compounds can form in the brazing seam region with increase of Al content. When Al content is 22 wt.%, CuAl2 intermetallic compounds become coarse, and the strength of brazed joint decreases.


Dai W.,Nanjing University of Aeronautics and Astronautics | Xue S.-B.,Nanjing University of Aeronautics and Astronautics | Lou J.-Y.,Zhejiang Xinrui Welding Material Co. | Lou Y.-B.,Zhejiang Xinrui Welding Material Co. | Wang S.-Q.,Zhejiang Xinrui Welding Material Co.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Using Zn - Al filler metal with Al content of 2-22 (mass fraction) and improved CsF-AlF 3 flux, wetting properties of Zn-Al filler metal on 3003 Al substrate were investigated. The mechanical property as well as the microstructure of the brazed joints was also studied. The results indicate that excellent joints can be produced by means of torch brazing when the Al content is less than 8. The metallographic structure in the brazing seam is mainly composed of Al based solid solutions and Zn based solid solutions. The high hardness value of brazing seam of the 3003 aluminum alloy is higher than that of the base metal due to the effect of solid solution strengthening. The results also show that three microstructure zones could be found at the brazing interface; i.e., base metal, diffusing zone and interface zone. The distribution of the solid solution in the brazing seam is the main factor of the tensile strength rather than the diffusion zone width near the interface. © 2012 The Nonferrous Metals Society of China.


Ji F.,Nanjing University of Aeronautics and Astronautics | Xue S.-B.,Nanjing University of Aeronautics and Astronautics | Lou J.-Y.,Zhejiang Xinrui Welding Material Co. | Lou Y.-B.,Zhejiang Xinrui Welding Material Co. | Wang S.-Q.,Zhejiang Xinrui Welding Material Co.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

The mechanical properties and microstructural distribution of the Cu/Al brazing joints formed by torch-brazing with different Zn-Al filler metals were investigated. The microstructure of the Zn-Al alloys was studied by optical microscopy and scanning electron microscopy, and the phase constitution of the Cu/Al joints was analyzed by energy dispersion spectrometry. The results show that the spreading area of the Zn-Al filler metals on the Cu and Al substrates increases as the Al content increases. The mechanical results indicate that the shear strength reaches a peak value of 88 MPa when Al and Cu are brazed with Zn-15Al filler metal. Microhardness levels from HV122 to HV515 were produced in the three brazing seam regions corresponding to various microstructure features. The Zn- and Al-rich phases exist in the middle brazing seam regions. However, two interface layers, CuZn 3 and Al 2Cu are formed on the Cu side when the Al content in the filler metals is 2 and more than 15, respectively. The relationship between intermetallic compounds on Cu side and Zn-xAl filler metals was investigated. © 2012 The Nonferrous Metals Society of China.


Ji F.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Zhang M.,Nanjing University of Aeronautics and Astronautics | Lou J.,Zhejiang Xinrui Welding Material Co. | Wang S.,Zhejiang Xinrui Welding Material Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

Cu/Al dissimilar metals were joined with Zn-22Al filler metal by torch-brazing technology and heat treated at constant temperature of 250°C for 0 to 1000 h. To guarantee the reliability of the Cu/Al torch-brazing joints in service requirement, the growth rate of intermetallic compounds on Cu side was calculated and the effects of the intermetallic compound layer on the electrical and mechanical properties have been investigated under various annealing time. It was observed that the width of intermetallic compound increased as the thermal aging proceeded, and the growth rate of the intermetallic compound was 6.1×10 13 cm 2/s when the aging temperature was 250°C. A thicker intermetallic compound layers could degrade the resistivity and shear strength of Cu/Al joints. When the thickness of intermetallic compound was 4.2 μm and 18.1 μm, the electric resistance was 120.3 μΩ and 132.9 μΩ, respectively. Moreover, the shear strength of Cu/Al brazing joint increased by 3% when the aging time was 100 h while the strength decreased by 15% when the Cu/Al joints endured 1000 h thermal aging.


Dai W.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Lou J.,Zhejiang Xinrui Welding Material Co. | Wang S.,Zhejiang Xinrui Welding Material Co.
Materials Transactions | Year: 2012

Ternary AlSiZn filler metals were designed in order to join the 6061 aluminum alloy. The microstructure, phase constitution and fracture morphology of the brazed joint were investigated. Results of the microstructure observation showed that eutectoid α(Al) + η(Zn), α(Al) solid solution, as well as Si particles formed in the filler metal. The melting points of these filler metals are much lower than Al12Si alloy. The ×(Zn), α(Al) solid solution, and the primary Si particles were found in the 6061 Al brazing seam when using Al0.2Si78Zn and Al2Si62Zn filler metal, while the AlSi eutectic were found when using Al6.5Si42Zn alloy. Results also indicate that the tensile strength of the 6061 Al brazed joints using Al0.2Si78Zn, Al2Si62Zn and Al6.5Si42Zn is 101, 109, 129 MPa, respectively. The fracture morphology of the brazed joints showed intergranular fracture mode while some transgranular fracture could be found in the joint of Al6.5Si42Zn filler metal. © 2012 The Japan Institute of Metals.


Dai W.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Lou J.,Zhejiang Xinrui Welding Material Co. | Wang S.,Zhejiang Xinrui Welding Material Co.
Materials and Design | Year: 2012

To develop new aluminum filler metals used for brazing 6061 alloy, the microstructure and properties of Al-6.5Si-42Zn-xSr alloys with different Sr content were studied. The results showed that the melting point of Al-6.5Si-42Zn alloy is around 520 °C, and Sr addition did not change the melting point of the filler metals, yet trace amounts of them greatly improved the microstructure of the alloys. As Sr content increased, the number of primary Si particles decreased and the eutectic Si changed from acicular to fine fibrous morphology in the Al-6.5Si-42Zn-xSr alloys. Meanwhile, Sr also refined the β-Fe intermetallic compound in the alloy. The wettability of the Al-6.5Si-42Zn-xSr brazing alloys improved with increasing Sr content, in addition, it was found that Sr addition also modified the microstructure of the brazing joints. From the tensile test results, the strength of the lap joints and the butt joints could be increased by 14% and 11%. © 2012 Elsevier Ltd.


Dai W.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Sun B.,Zhejiang Xinrui Welding Material Co. | Lou J.,Zhejiang Xinrui Welding Material Co. | Wang S.,Zhejiang Xinrui Welding Material Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

The effect of Cu-P modification on the microstructure of Al-Si-Zn filler metal and 6061 aluminum brazed joints were investigated. Experimental results showed that the tensile strength of 6061 aluminum brazed joints were improved by Cu-P addition, and the highest value was achieved at 144 MPa when the content of Cu-P was 1.5%. A small amount of P addition can modify the primary Si and refine α-Al in the filler metal. Primary Si growth based on the finely AlP phases were induced by Cu-P addition, and the size of primary Si was much smaller than that without P. Meanwhile, after P addition, the eutectic point of Al-Si moves to the Si side. It can be found that the phases in Al-Si-Zn brazed 6061 aluminum joint are α-Al, η-Zn, and Si particles, and the phases in Al-Si-Zn-Cu-P brazed seam are α-Al, η-Zn, fine Si particles, AlP phase.


Zhang S.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Yang J.,Nanjing University of Aeronautics and Astronautics | Lou J.,Zhejiang Xinrui Welding Material Co. | Wang S.,Zhejiang Xinrui Welding Material Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

The effect of P on the spreadability, micro-structure of Al-Si-Zn filler metal and the mechanical properties of brazed joints were studied. Results show that the spreadability of the Al-Si-Zn filler metal was improved by the addition of P, and furthermore, both the plate shape primary silicon and needle shape eutectic silicon of the filler metal were refined effectively. Tensile tests indicate that the fracture position of lap joints locates at the base metal and butt joints locates at brazing seam respectively, and the tensile strength of the butt joint brazed with Al-Si-Zn filler metal increased firstly, and then decreased with the increasing of P addition. When the content of P was about 0.06%, the comprehensive properties of the Al-Si-Zn filler metal were the best.


Ji F.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Liu S.,Nanjing University of Aeronautics and Astronautics | Lou J.,Zhejiang Xinrui Welding Material Co. | Lou Y.,Zhejiang Xinrui Welding Material Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

The creep behavior of Zn-22Al and Zn-22Al-0.03Ti filler metals at room temperature were studied by nanoindentation in this paper, and constant loading rate method was used to calculate the creep stress exponent. The results indicate that, both the Zn-22Al and Zn-22Al-0.03Ti produced obvious creep deformation under holding load. Both the depth and creep displacement of Zn-22Al-0.03Ti were less than that of Zn-22Al, and the maximum difference were 15.68% and 26.87%, respectively. Under the constant time, the filler metals produced different creep displacement with different loadings. The creep stress exponents of two filler metals at room temperature were obtained by fitting method. Zn-22Al-0.03Ti had a higher creep stress exponent than Zn-22Al filler metal, which implied that Ti-bearing filler metals had better creep resistance than Zn-22Al alloy. The grain of Zn-22Al filler metal could be refined remarkably with the Ti addition, which might result in the increase of grain boundary and finally enhanced the creep resistance of alloy.

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