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Autogenous fiber laser welding of 70/30 Cu-Ni alloy plates
摘要： Cupronickel alloys such as 70/30 Cu-Ni have excellent resistance to sea water corrosion and anti-fouling properties, and thus have been widely used for naval and offshore applications. Traditionally, arc welding and brazing processes have been used to weld such materials. In contrast, laser beam welding is a promising technology due to its high productivity, good process flexibility and reliability, and good welding integrity. In the present work, a high power fiber laser system is used to weld 5-mm thick 70/30 Cu-Ni alloy plates in a configuration of butt joints. Then, the laser welded joints are evaluated in terms of microstructures, defects, and mechanical properties (hardness, face and root bend, and tensile) in accordance with the applicable International Organization for Standardization and Defence Standard specifications.
关键词： Tensile Properties,Microstructure,Butt Joint,Cupronickel Alloy,Bend testing,Laser Welding
更新于2025-11-28 14:24:20
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Microstructure and mechanical properties of welding–brazing of Ti/Al butt joints with laser melting deposition layer additive
摘要： Laser welding–brazing of Ti/Al butt joints was performed with coaxial Al–10Si–Mg powders feeding. The experimental results indicated that a sound Ti/Al butt joint could be obtained by an additive layer approach. The influence of the laser melting deposition layers on the weld appearance, interfacial microstructure and tensile properties were investigated. High-quality joints were produced when five and seven layers were deposited. The morphology and thickness distributions of the interfacial intermetallic compounds (IMC) at the brazing interface along the thickness direction of the joint varied with the number of deposition layers. Continuous serrated IMC was obtained in joints produced by seven deposition layers, and the IMC layer was distributed homogenously along the thickness direction. The maximum thickness difference of the IMC was only approximately 0.12 μm. The microstructure of the IMC layer was composed of a nanosized granular Ti7Al5Si12 phase and serrated Ti(Al, Si)3 phase. The maximum tensile joint strength reached 240 MPa, 80% of that of the aluminum base metal, and the lower tensile strength of the other joints was caused by insufficient IMC layer or a porosity defect.
关键词： Tensile strength,Laser melting deposition,Interfacial IMC,Laser welding–brazing,Ti/Al butt joint
更新于2025-09-19 17:15:36
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Wettability, microstructure and properties of 6061 aluminum alloy/304 stainless steel butt joint achieved by laser-metal inert-gas hybrid welding-brazing
摘要： Laser?metal inert-gas (MIG) hybrid welding?brazing was applied to the butt joint of 6061-T6 aluminum alloy and 304 stainless steel. The microstructure and mechanical properties of the joint were studied. An excellent joint-section shape was achieved from good wettability on both sides of the stainless steel. Scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffractometry indicated an intermetallic compound (IMC) layer at the 6061-T6/304 interface. The IMC thickness was controlled to be ~2 μm, which was attributed to the advantage of the laser?MIG hybrid method. Fe3Al dominated in the IMC layer at the interface between the stainless steel and the back reinforcement. The IMC layer in the remaining regions consisted mainly of Fe4Al13. A thinner IMC layer and better wettability on both sides of the stainless steel were obtained, because of the optimized energy distribution from a combination of a laser beam with a MIG arc. The average tensile strength of the joint with reinforcement using laser?MIG hybrid process was improved to be 174 MPa (60% of the 6061-T6 tensile strength), which was significantly higher than that of the joint by traditional MIG process.
关键词： laser?metal inert-gas hybrid welding,microstructure,butt joint,welding?brazing
更新于2025-09-19 17:13:59
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Formability of Laser Welding Plates of Dissimilar Materials
摘要： Hydraulic deformation is a procedure utilized for forming sheet by applying the pressure driven pressurized fluid on the sheet. This procedure is described by its capacity to give homogenous strain distribution along the blank with high mechanical properties. The analysis of the sample deformation process has performed by using circular welded plate by laser technique of dissimilar steel plate (SS304-St1008) with thickness 1mm using profile radius for lower die 2 mm under the effect of blank holder force 10 kN. The metal thickness checked and the SEM test investigated for the formability product of laser welded plate. Discoveries show that by and large better mechanical characteristics, for example, formability, tensile and yield strength of welded joints can be achieved by using laser welding and the blank deformation becomes uniform with the hydraulic force. It is useful to avoid thinning of the blank with suitable friction coefficient between the die and the blank. Based on the experimental results of dissimilar metal, it found, that the joint weld strength parts, was lesser than the base strength, so the fracture is occur on the base metal. The SEM investigation indicated that the joining process between the SS304 and St1008 was occurred by heating due to laser on the other hand the depth of the interface between the joint materials had the range of 3-5 μm . The EDS examination indicated that the interface zone of the jointed contained Cr, Ni, C and Fe, the left side is SS304 passing through the region zone and ending with St1008, the ratio of Fe increased and the other elements decreased.
关键词： Laser welding,Deep drawing process,hydroforming process,Butt joint,SS304 metal,hydropunch,St1008 metal,Formability
更新于2025-09-12 10:27:22
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Effect of Laser Beam Welding on the Cyclic Material Behavior of the Press-hardened Martensitic Chromium Steel X46Cr13
摘要： For the application of high-strength materials in welded joints, a point of principle is how the strength of the sheet metal is affected by cyclic loading and by welding. For the investigation of the cyclic material behavior of the press-hardened martensitic chromium steel X46Cr13, strain-controlled fatigue tests were performed and evaluated. The aim of compensating the limitations in the weldability of this press-hardened material is achieved by a reduced heat input of the laser beam welding and a defined heat treatment. The effect of laser beam welding on the fatigue properties is shown by the cyclic behavior of butt joints. The cyclic material behavior is the basis of strain-based fatigue assessment approaches. Both cyclic stress-strain curves and strain-life curves are used for the fatigue life estimation. No clear difference between the press-hardened base material and butt joints has been found in the cyclic stress-strain curves. Transient effects are found by comparison of hysteresis loops of the initial loading, at the cyclically stabilized state and at crack initiation. Cyclic hardening is concluded from the initial loading and the cyclically stabilized state. By comparison of strain-life curves, a difference in the number of cycles to crack initiation between the base material and butt joints is found. Cycles to crack initiation of butt joints tested under strain control result in over 50 % of the base material’s fatigue strength at 1·106 cycles to failure.
关键词： high manganese TWIP steels,high-strength steel,MnCr steels,butt joint,laser beam welding,Martensitic stainless steel,integral fatigue life estimation method,press-hardening,cyclic material behavior
更新于2025-09-12 10:27:22
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Effect of Laser Beam Oscillation on Laser Welding–Brazing of Ti/Al Dissimilar Metals
摘要： Ti4Al6V and 6061 Al dissimilar metals were butt welded by the laser oscillating welding method. The e?ects of laser o?set, oscillation frequency, and energy distribution on the formation, microstructure, and tensile properties of dissimilar metal joints are discussed in detail. The experimental results show that the Ti6Al4V was micro melted with a laser o?set of 1.1 mm, and a large number of intermetallic compounds (IMCs) were formed on the side of the Ti6Al4V. Additionally, there were some porosity defects in the fusion zone (FZ) due to an inappropriate laser oscillation frequency. When the laser o?set was increased to 1.2 mm, the IMC distribution was uniform and the thickness was controlled below 2 μm. The porosity defects in the FZ decreased and the tensile strength of the joints increased signi?cantly. The maximum value of tensile strength reached 173 MPa at a laser frequency of 28 Hz.
关键词： dissimilar metals,tensile properties,microstructure,laser beam oscillation,Ti/Al butt joint
更新于2025-09-12 10:27:22
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10 Gb/s NRZ and 20 Gb/s PAM4 transmission using an EAM-integrated widely tunable DBR laser
摘要： We report data transmissions using a widely tunable InP-based distributed Bragg reflector (DBR) laser integrated monolithically with an electroabsorption modulator (EAM). The laser has a wavelength tuning range of over 12 nm that is obtained by current injection into the DBR section because the butt-jointed InGaAsP DBR material bandgap wavelength. Data transmissions of 10 Gb/s nonreturn to zero (NRZ) at distances of up to 75 km of a single mode fiber have been demonstrated. A power penalty of less than 0.9 dB has been obtained when compared to the BtB condition. In addition, four-level pulse amplitude transmissions of 20 Gb/s modulation (PAM4) data at distances of up to 45 km have been conducted successfully. These results indicate that the EAM-modulated DBR laser is promising for long-reach low-cost WDM optical network applications.
关键词： Distributed Bragg reflector,electroabsorption modulator,data transmission,widely tunable DBR laser,butt-joint
更新于2025-09-11 14:15:04