scholarly journals Compound connection mechanism of Al2O3 ceramic and TC4 Ti alloy with different joining modes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan Zhang ◽  
YanKun Chen ◽  
JianPing Zhou ◽  
DaQian Sun ◽  
HongMei Li
Keyword(s):  
Tensile Strength ◽  
Heat Conduction ◽  
Laser Beam ◽  
Laser Welding ◽  
Filler Metal ◽  
Dissimilar Material ◽  
Ti Alloy ◽  
Al2o3 Ceramic ◽  
Maximum Tensile Strength ◽  
Fusion Weld

AbstractIn this paper, laser welding-brazing of TC4 Titanium (Ti) alloy and Al2O3 ceramic dissimilar material was carried. The results showed that the Ti alloy and Al2O3 were joined by melting filler metal when the laser was concentrated in the Ti alloy side of the joint. The joint with one fusion weld and one brazed weld separated by remaining unmelted Ti alloy. Laser beam offset the Ti alloy 1.5 mm, Ti alloy would not be completely melted in joint. Through heat conduction, the filler metal melted occurred at the Ti-ceramic interface. A brazed weld was formed at the Ti-ceramic interface with the main microstructure of β-CuZn + Ti2Zn3, β-CuZn and Al2Cu + β-CuZn. The joint fractured at the brazed weld with the maximum tensile strength of 169 MPa.

Laser welding-brazing of alumina to 304 stainless steel with an Ag-based filler material

2020 ◽  
Vol 118 (1) ◽  
pp. 104
Author(s):  
Yan Zhang ◽  
YanKun Chen ◽  
JianPing Zhou ◽  
DaQian Sun ◽  
HongMei Li
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Heat Conduction ◽  
Laser Beam ◽  
Laser Welding ◽  
Reaction Layer ◽  
Filler Metal ◽  
304 Stainless Steel ◽  
Dissimilar Metal ◽  
Fusion Weld

In this paper, laser welding-brazing of 304 stainless steel (SS) and Al2O3 ceramic dissimilar metal material was carried out. The results showed that the SS and Al2O3 were joined by melting filler metal when the laser was focused on the SS side of the joint. One process was one pass welding involving creation of a joint with one fusion weld and one brazed weld separated by remaining unmelted SS. When laser beam was focused on the SS plate 1.5 mm, SS would not be completely melted in joint. Through heat conduction, the filler metal (68.8 wt.% Ag, 26.7 wt.% Cu, 4.5 wt.% Ti) melting occurred at the SS-Al2O3 ceramic interface. A brazed weld was formed at the SS-Al2O3 ceramic interface with the main microstructure of Cu[s.s.] + Ag[s.s.], Ti2Cu + TiFe and Ag + AlCu2Ti. The joint fractured in reaction layer at the ceramic side with the maximum tensile strength of 74 MPa.

Microstructure and mechanical property improvement of dissimilar metal joints for TC4 Ti alloy to Nitinol NiTi alloy by laser welding

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yan Zhang ◽  
DeShui Yu ◽  
JianPing Zhou ◽  
DaQian Sun ◽  
HongMei Li
Keyword(s):  
Tensile Strength ◽  
Laser Welding ◽  
Mechanical Performance ◽  
Niti Alloy ◽  
Welding Process ◽  
Ti Alloy ◽  
The One ◽  
Fusion Weld ◽  
Welding Processes ◽  
Cu Interlayer

Abstract To avoid the formation of Ti-Ni intermetallics in a joint, three laser welding processes for Ti alloy–NiTi alloy joints were introduced. Sample A was formed while a laser acted at the Ti alloy–NiTi alloy interface, and the joint fractured along the weld centre line immediately after welding without filler metal. Sample B was formed while the laser acted on a Cu interlayer. The average tensile strength of sample B was 216 MPa. Sample C was formed while the laser acted 1.2 mm on the Ti alloy side. The one-pass welding process involved the creation of a joint with one fusion weld and one diffusion weld separated by the remaining unmelted Ti alloy. The mechanical performance of sample C was determined by the diffusion weld formed at the Ti alloy–NiTi alloy interface with a tensile strength of 256 MPa.

scholarly journals Wire-Feeding Laser Welding of Copper/Stainless Steel Using Different Filler Metals

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2122
Author(s):  
Xiaoyan Gu ◽  
Ziwei Cui ◽  
Xiaopeng Gu ◽  
Jiaxu Shao
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Laser Welding ◽  
Large Deformation ◽  
Grain Refinement ◽  
Filler Metal ◽  
Weld Interface ◽  
Grain Sizes ◽  
Filled Joint ◽  
Wire Feeding

Ni-based filler metal and Ni-Cu-based filler metal were used to obtain copper/stainless steel (Cu/SS) joints through wire-feeding laser welding. Along the SS/weld interface, there exist different grain sizes (from coarse columnar grains to fine equiaxed grains). The heat affected zone (HAZ) on the copper side consisted of two areas with different grain sizes and the size of the grain in the Cu-HAZ of the Ni-Cu-based filled joint was much smaller than that of the Ni-based filled joint. Our results showed that grain refinement at the copper/weld (Cu/weld) interface of the Ni-Cu-based filled joint was observed through high-resolution electron backscattered diffraction (EBSD). There was a hardness elevation at the Cu/weld interface of the Ni-Cu-based filled joint due to the grain refinement on the weld of the copper side. The maximum tensile strength of the Ni-Cu-based filled joint was obtained and reached 91.2% of the tensile strength of the copper base metal (Cu-BM). Joints in this study were observed to fracture in a ductile mode. Furthermore, the Ni-Cu-based filled joint exhibited a higher plastic deformation, which was primarily caused by the large deformation of the weld zone and the large deformation of the Cu-BM due to the high plasticity of the weld, which alleviated the stress concentration, as indicated by 2D-digital image correlation (DIC) test results.

scholarly journals Mechanical Properties of Joints Made in Steel S1300QL Using Various Welding Methods

2020 ◽  
pp. 9-22
Author(s):  
Mirosław Łomozik
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electron Beam ◽  
Laser Welding ◽  
Yield Point ◽  
Electron Beam Welding ◽  
Filler Metal ◽  
Welding Method ◽  
Minimum Yield ◽  
Made In

The article presents applications of high-strength quenched steels in various industrial sectors and the chronological development of various grades of the aforesaid steels. The research-related tests involved flat butt joints made in 7 mm thick steel grade S1300QL, welded using the following methods: TIG, A-TIG, MAG involving the use of a hard flux-cored surfacing wire, MAG method involving the use of a solid wire, T.I.M.E. method involving the use of a solid wire, laser welding method without the use of the filler metal, hybrid (HLAW) method involving the use of a metallic flux-cored wire, electron beam welding without using the filler metal. The research also involved the performance of the mechanical properties of the welded joints made in quenched steel S1300QL using various welding methods. The joints made using the laser welding method, hybrid welding method and the electron beam welding method were characterised by tensile strength higher than the minimum yield point of steel S1300QL, amounting to 1300 MPa. In turn, the tensile strength of the joints made in steel S1300QL using arc welding methods was lower than the minimum yield point of the steel. All of the test joints were subjected to non-destructive digital radiographic tests. The tests concerning the mechanical properties of the joints with respect to various welding methods were subjected to comparative analysis. The research work finished with the formulation of concluding remarks concerning the mechanical properties of the joints.

Research on the Laser Welding Technology of LF21

2014 ◽  
Vol 941-944 ◽  
pp. 2012-2015
Author(s):  
Jia Rui Qi ◽  
Xu Ren Huang ◽  
Hai Xia Sun ◽  
Yan Li Li
Keyword(s):  
Tensile Strength ◽  
Laser Welding ◽  
Pulse Width ◽  
Welded Joint ◽  
Pulsed Laser ◽  
Base Material ◽  
Pulse Frequency ◽  
Pulsed Laser Welding ◽  
Maximum Tensile Strength ◽  
Welding Technology

Traditional welding methods are difficult to adapt to the development of welding technology of aluminum alloys. Laser welding plays an important role in this field increasingly for its advantages. In this investigation, LF21 plate with a thickness of 2mm was welded utilizing the pulsed laser welding and the mechanical properties of the laser welded joints are analyzed. The tensile strength of welded joint is in the range of 196 Mpa to 232 Mpa. The maximum tensile strength is obtained at the working current of 250 A, pulse width of 6 ms and pulse frequency of 2 Hz. The maximum tensile strength can reach 87% of base material. The intensity factor of welded joint is in the range of 74% to 87%. The welded joint can meet the requirements of users.

Peculiarities of AD33 aluminum alloy hand laser welding

2020 ◽  
Vol 2020 (12) ◽  
pp. 13-17
Author(s):  
Nikolay Proskuryakov ◽  
Uliana Putilova ◽  
Rasul Mamadaliev ◽  
Oleg Teploukhov
Keyword(s):  
Aluminum Alloy ◽  
Laser Beam ◽  
Laser Welding ◽  
Welded Joint ◽  
Comparative Investigation ◽  
Micro Structure ◽  
Joint Quality ◽  
Beam Motion

The comparative investigation results of AD33 aluminum alloy welded joint quality dependence upon changes in a laser beam motion rate for conditions of hand and automatic laser welding are shown. A micro-structure of a welded joint at the hand and automatic laser welding of the AD33 alloy is investigated.

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