Characteristics of TIG arc-assisted laser welding–brazing joint of aluminum to galvanized steel with preset filler powder

Li, Chunling; Fan, Ding; Wang, Bin

doi:10.1007/s12598-015-0539-9

Cited by 13 publications

(4 citation statements)

References 16 publications

(18 reference statements)

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“…However, the good wettability of molten Al on the solid steel [21] has been difficult to obtain, because factors such as unequal temperature distribution, rapid cooling rate, and deficient heating during laser welding-brazing deteriorated the wetting and spreading of liquid Al alloy on the steel surface [22]. To improve the wettability, a variety of filler materials or specific techniques have normally been required, such as the use of chemical flux, brazing in vacuum or inert gas atmosphere, surface preparation [21,23], which resulted in additional costs generated by the flux application and the subsequent cleaning necessary to remove all residues detrimental to corrosion resistance [21]. To avoid the wettability problems, laser keyhole welding could be utilized [5,17,21], which provides very short interaction times between liquid steel and liquid Al to limit IMC phases without any filler materials [24].…”

Section: Introductionmentioning

confidence: 99%

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Cui

Chen

et al. 2018

Metals

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Welding of dissimilar steel/Al lapped joints of 1.5 mm in thickness was carried out by using dual-beam laser welding with side-by-side configuration. The effect of the major process parameters including the dual-beam power ratio of (Rs) and dual-beam distance (d1) on the steel/Al joint characteristics was investigated concerning the weld shape, interface microstructures, tensile resistance and fracture behavior. The results show that dual-beam laser welding with side-by-side configuration produces soundly welded steel/Al lapped joints free of welding defects. The processing parameters of Rs and d1 have a great influence on the weld appearance, the weld penetration in the Al alloy side (P2) and the welding defects. Variation in the depth of the P2 and the locations at the Al/weld interface cause heterogeneous microstructures in the morphology and the thickness of the intermetallic compound (IMC) layers. In addition, electron back scattered diffraction (EBSD) phase mapping reveals that the IMC layer microstructures formed at the Al/weld interface include the needle-like θ-Fe4Al13 phases and compact lath η-Fe2Al5 layers. Some very fine θ-Fe4Al13 and η-Fe2Al5 phases generated along the weld grain boundaries of the steel/Al joints are also confirmed. Finally, there is a matching relationship between the P2 and the tensile resistance of steel/Al joints, and the maximum tensile resistance of 109.2 N/mm is obtained by the steel/Al joints produced at the Rs of 1.50 during dual-beam laser welding with side-by-side configuration. Two fracture path modes have taken place depending on the P2, and relatively high resistance has been achieved for the steel/Al joints with an optimum P2.

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Section: Introductionmentioning

confidence: 99%

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Cui

Chen

et al. 2018

Metals

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“…Components with adequate ductility, high strength, good corrosion resistance, and desirable electrical and thermal conductivities have been achieved through DM welding [3,4]. Several DM welding techniques have been reported, including Welding-Brazing [5][6][7], Arc [8][9][10], Friction [11], Friction stir [12,13], Ultrasonic [14,15], Explosive welding [16], Laser [17][18][19], and Hybrid Laser-Arc welding [20,21].…”

Section: Introductionmentioning

confidence: 99%

Fiber Laser Welding of Dissimilar 2205/304 Stainless Steel Plates

Mohammed

Ishak

Ahmad

et al. 2017

Metals

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Abstract:In this study, an attempt on pulsed-fiber laser welding on an austenitic-duplex stainless steel butt joint configuration was investigated. The influence of various welding parameters, such as beam diameter, peak power, pulse repetition rate, and pulse width on the weld beads geometry was studied by checking the width and depth of the welds after each round of welding parameters combination. The weld bead dimensions and microstructural progression of the weld joints were observed microscopically. Finally, the full penetration specimens were subjected to tensile tests, which were coupled with the analysis of the fracture surfaces. From the results, combination of the selected weld parameters resulted in robust weldments with similar features to those of duplex and austenitic weld metals. The weld depth and width were found to increase proportionally to the laser power. Furthermore, the weld bead geometry was found to be positively affected by the pulse width. Microstructural studies revealed the presence of dendritic and fine grain structures within the weld zone at low peak power, while ferritic microstructures were found on the sides of the weld metal near the SS 304 and austenitic-ferritic microstructure beside the duplex 2205 boundary. Regarding the micro-hardness tests, there was an improvement when compared to the hardness of duplex and austenitic stainless steels base metals. Additionally, the tensile strength of the fiber laser welded joints was found to be higher when compared to the tensile strength of the base metals (duplex and austenitic) in all of the joints.

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“…Compared with arc welding, laser welding has attracted wide attention of researchers due to its high energy density, small welding deformation and fast welding speed [4]. Laser-MIG composite heat source welding is superior to single laser heat source in welding speed, welding cost and assembly requirements due to its dual characteristics of laser and arc [5][6][7]. At present, research reports on steel/aluminum dissimilar alloy laser and laser-MIG hybrid welding are mainly concentrated in the automotive field.…”

Section: Introductionmentioning

confidence: 99%

“…However, liquid aluminum has poor wettability to steel. Therefore, it is necessary to use flux or add an intermediate layer to form an effective joint during the experiment, but this method complicates the test process and reduces the efficiency [8][9][10]. However, as modern equipment is lighter, the requirements for low cost and high performance manufacturing continue to increase, and steel/aluminum dissimilar alloy joint structures are also widely used in shipbuilding [11].…”

Section: Introductionmentioning

confidence: 99%

Laser-MIG Hybrid Keyhole Welded 6mm Steel/Aluminum Butt Joints

Cui

Chen

et al. 2019

MSF

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At present, the connection of steel/aluminum joints has been widely used in industrial fields such as aerospace, marine and automotive.Although the joints with excellent performance can be obtained by the solid phase welding methods such as explosion welding and friction welding, the production process is complicated and the efficiency is low, and the practical application is limited.Laser welding has attracted a lot of attention from researchers because of its advantages of high energy density, small welding deformation and fast welding speed.However, in the single-beam laser welding process, there are problems such as high joint assembly precision, excessive energy density, and easy formation of depressions in the weld.The newly developed laser-MIG (Metal Inert Gas) hybrid welding not only retains the advantages of laser welding, but also fully exploits the advantages of MIG welding, improves weld formation, improves the stability of the welding process, and helps solve the single-beam laser welding problems.In this paper, the laser deep penetration welding process of 5.5 mm thick E36 steel and 6 mm thick 5083 aluminum alloy butt joint was studied by laser-MIG composite welding heat source. Compared with the single laser welding process, the influence of wire feed speed on the welded steel/aluminum joint, joint interface structure and joint mechanical properties was studied.The results show that the laser-MIG composite deep-melt welding can obtain good steel/aluminum butt joint performance. At a laser power of 3.25 kW, a wire feed speed of 1.5 m / min, a laser offset of 0.5 mm and a defocus of 0 mm, the tensile strength of the steel/aluminum butt joint is as high as 85.0 MPa.Laser-MIG hybrid welding can improve the dent defects of a single laser welded steel/aluminum butt joint. The amount of acicular Fe4Al13 phase in the intermetallic compound was significantly reduced, and the resistance of the steel/aluminum joint was increased from 8.6 kN to 12.7 kN.

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Characteristics of TIG arc-assisted laser welding–brazing joint of aluminum to galvanized steel with preset filler powder

Cited by 13 publications

References 16 publications

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Fiber Laser Welding of Dissimilar 2205/304 Stainless Steel Plates

Laser-MIG Hybrid Keyhole Welded 6mm Steel/Aluminum Butt Joints

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