Parametric Dependence and Characterization of Laser Brazed Copper-Stainless Steel Joints

2012 ◽  
Vol 585 ◽  
pp. 450-454
Author(s):  
Sohan Lal ◽  
C.P. Paul ◽  
C.H. Premsingh ◽  
P. Bhargava ◽  
S.K. Mishra ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Joint Strength ◽  
Filler Metal ◽  
Laser Energy ◽  
Unit Length ◽  
Processing Parameters ◽  
Laser Brazing ◽  
Brazed Joints ◽  
Point Bend

Joining of dissimilar metals leading to better material utilization with improved functionality encouraged the research thrust on various dissimilar material joining processes including laser brazing. This papers reports the development of laser brazing joints and their characterization for 3 mm thick Cu sheet with 3 mm thick AISI 316L stainless steel (SS) sheet in butt joint configuration using 63Ag-35.25Cu-1.75Ti active brazing foil as filler metal. Comprehensive experiments were carried out to identify the optimum processing parameters for controlled simultaneous heating of the filler metal and sh-7eets by laser beam resulting in melting of the filler metal without melting Cu and SS sheets. Using this methodology, a number of brazed joints were successfully prepared at different set of processing parameters. The brazed joints were subjected to various non-destructive (visual and dye-penetrant test) and destructive (microscopic examination, energy dispersive spectroscopy, four point bend testing etc.) characterization techniques. The results demonstrated that laser energy per unit length of 100 J/m is threshold limit for feasibility of brazing process for selected metal and thickness combination. Microscopic studies of transverse section of laser brazed joint showed full penetration across the thickness without the melting of parent metals. EDS studies showed the diffusion of filler material (Ag) more towards the Cu sheet as compared to that of SS sheet. Four point bend test showed that the alignment of laser beam-metal joint was critical for the brazing joint strength and improved joint strength was achieved when the beam was at the centre of the brazing joint. A maximum joint strength of 343.7 MPa was achieved for laser power of 550 W at scan speed of 3 mm/min.

Elements Diffusion and Mechanical Properties of 15-5PH Stainless Steel Joint Brazed with BNi-2 Filler Metal

2016 ◽  
Vol 850 ◽  
pp. 700-705 ◽  
Author(s):  
Qian Qian Sun ◽  
Sheng Lu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Stainless Steel ◽  
Melting Point ◽  
Bonding Strength ◽  
Joint Strength ◽  
Filler Metal ◽  
Holding Time ◽  
Middle Zone ◽  
Brazed Joints

The effects of brazing time on elements diffusion and bonding strength of vacuum brazed joints of 15-5PH stainless steel using filler metal BNi-2 were investigated. The results showed that the brazing time determined the content of diffused elements. If holding time is short the distribution of melting point depressants (MPD) concentrated on the middle zone of the joint, and the generation of brittle phases in the joint was unavoidable. With increasing time, MPD can diffuse to base metal adequately and full solid solution of nickel formed in the brazing joint. Joint strength firstly increased and then decreased with prolonging holding time.

scholarly journals Micro-Brazing of Stainless Steel Using Ni-P Alloy Plating

2019 ◽  
Vol 9 (6) ◽  
pp. 1094
Author(s):  
Shubin Liu ◽  
Ikuo Shohji ◽  
Makoto Iioka ◽  
Anna Hashimoto ◽  
Junichiro Hirohashi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Solid Solutions ◽  
Joint Strength ◽  
Filler Metal ◽  
Average Shear Strength ◽  
Average Shear ◽  
Brazed Joints ◽  
Brazed Joint ◽  
Alloy Plating

A Ni-P plated layer of 20 μm thickness containing 11 wt.% P was formed on the surface of a stainless steel (SUS304) plate by electroplating. The microstructure and joint strength of the brazed joint with the electroplated Ni-11P layer were investigated. The results indicated that the filler metal was homogeneously distributed between the SUS304 plates and no voids or flaws formed in the brazed filler zone. Fe-Ni-Cr solid solutions were formed at the brazed interface. Moreover, P was mainly concentrated in such brazed filler zone to form P-containing phases. The average shear strength of the brazed joints was determined to be 47.3 MPa. The results demonstrated that the brazing of SUS304 plates using the electroplated Ni-11P layer as the filler metal was successfully realized.

Computer Simulation of Wetting and Flowing Behaviors of Filler Metal during Laser Brazing Process

2008 ◽  
Vol 580-582 ◽  
pp. 271-274 ◽  
Author(s):  
Kazuyoshi Saida ◽  
Woo Hyun Song ◽  
Kazutoshi Nishimoto
Keyword(s):  
Computer Simulation ◽  
Stainless Steel ◽  
Filler Metal ◽  
Butt Joint ◽  
304 Stainless Steel ◽  
Base Metals ◽  
Laser Brazing ◽  
Cu Substrate ◽  
Single Beam ◽  
Joint Gap

The wetting and flowing behaviors of the filler metal during laser brazing process were analyzed by the computer simulation. Two situations of the wetting and flowing during laser brazing were modelled, i.e., the metled Au-18%Ni and Ag-10%Pd filler metals on the butt joint of Inconel 600, and the melted Cu-8%Sn filler metal on the dissimilar butt joint of type 304 stainless steel to Cu. The filler metal droplet wetted and spread on the base metals and simultaneously infiltrated into the joint gap with the lapse of time. The Au-Ni and Ag-Pd filler metal infiltrated into the 0.3mm wide joint gap at the completion of brazing even in the single beam brazing. The Au-Ni filler metal did not infiltrate into the joint gap completely at the brazing clearances of 0.1-0.2mm in the single beam brazing, however, it could be filled up in the joint gap in the tandem beam brazing. The Cu-Sn filler metal wetted on the both base metals of stainless steel and Cu and filled up the 0.3mm wide joint gap when the location of preheating beam deviated in 0.5mm to Cu substrate, however, it did not infiltrate into the joint gap completely at the deviation distance of preheating beam to Cu substrate being 1.0mm. It followed that the wetting and flowing behaviors of the filler metal during laser brazing process could be predicted by the computer simulation.

scholarly journals Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 198 ◽  
Author(s):  
Peng Xue ◽  
Yang Zou ◽  
Peng He ◽  
Yinyin Pei ◽  
Huawei Sun ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Penetration Depth ◽  
Aging Process ◽  
Filler Metal ◽  
Aging Treatment ◽  
304 Stainless Steel ◽  
Dissimilar Metal ◽  
Brazed Joints ◽  
Brazed Joint

The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16.5CuZnSn-0.15Ce brazed joint was decreased by 48.8% compared with the Ag16.5CuZnSn brazed joint. Moreover, the shear strength of the brazed joint decreased with aging time while the shear strength of the AgCuZnSn-xGa-yCe joint was still obviously higher than the Ag16.5CuZnSn joint after a 600 h aging treatment. The fracture type of the Ag16.5CuZnSn-xGa-yCe brazed joints before aging begins ductile and turns slightly brittle during the aging process. Compared to all the results, the Ag16.5CuZnSn-2Ga-0.15Ce brazed joints show the best performance and could satisfy the requirements for cost reduction and long-term use.

Diode Laser Brazing of Heat-Resistant Alloys Using Tandem Beam

2005 ◽  
Vol 502 ◽  
pp. 493-498 ◽  
Author(s):  
Kazuyoshi Saida ◽  
Woo Hyun Song ◽  
Kazutoshi Nishimoto ◽  
Makoto Shirai
Keyword(s):  
Diode Laser ◽  
Base Metal ◽  
Filler Metal ◽  
Processing Parameters ◽  
Narrow Gap ◽  
Laser Brazing ◽  
Single Beam ◽  
Inconel 600 ◽  
Heat Resistant ◽  
Filler Metals

The diode laser brazing of heat-resistant alloys with precious filler metals has been conducted using tandem beam which consisted of preheating beam and main brazing beam. The 1mm thick Inconel 600 and A286 alloys were laser-brazed with the 0.5mm diameter Au-18%Ni, Ag-10%Pd and Ag-21%Cu-25%Pd filler metals using a brazing flux. The processing parameters of laser power of tandem beam and brazing clearance were varied. Sound butt joints could be obtained by using tandem beam with laser powers of 200-400W/100-150W even at the narrow gap brazing below 0.3mm where the melted filler metal did not infiltrate completely the joint gap by only using the main brazing beam (single beam). The tensile strength of the brazed joint using Ag-Pd filler metal increased with decreasing brazing clearance and attained about 70% of the base metal strength at brazing clearance of 0.1mm, while those using Au-Ni and Ag-Cu-Pd filler metals were comparable to the base metal strength at any brazing clearance between 0.1-1.5mm. The preheating during the tandem beam brazing resulted in superior brazability at the narrow gap to wide gap brazing because of the improvement in wetting/spreading and erosion esistance of melted filler metal by depressing the extremely high peak temperature and steep temperature distribution in the base metal.

Effects of Ni and Co Additions to Filler Metals on Ag-Brazed Joints of Cemented Carbide and Martensitic Stainless Steel

2014 ◽  
Vol 922 ◽  
pp. 322-327 ◽  
Author(s):  
Kengo Kaiwa ◽  
Shinji Yaoita ◽  
Tomohiro Sasaki ◽  
Takehiko Watanabe
Keyword(s):  
Stainless Steel ◽  
Joint Strength ◽  
Martensitic Stainless Steel ◽  
Braze Alloy ◽  
Cemented Carbide ◽  
Suppression Effect ◽  
Brazed Joints ◽  
Co Addition ◽  
Multiple Addition ◽  
Filler Metals

This study focuses on understanding the effect of Ni and Co additions to filler metals on Ag-brazed joints of cemented carbide and martensitic stainless steel. Ni and Co added braze alloys were processed based on Ag-Cu-Zn ternary alloy, and joint strength and microstructure of the brazed layer has been investigated. The joint strength increased by the 2.0mass%Ni and 0.5mass%Co addition into braze alloy. This trend is remarkable in the Co added alloy, and the brazed joint increased by 141% compared to that in no-added alloy. The joint strength was closely related to the suppression effect of Co dissolution from cemented carbide into filler layer and Fe diffusion from the stainless steel to the brazed layer. In the brazed microstructure, Co-depleted zone caused by dissolution of Co in the cemented carbide was observed near the interface between the cemented carbide and the steel. Width of the Co-depleted zone significantly decreased in the Co added alloy. However, the joint strength decreased in the multiple addition compared to that in the single addition of Ni or Co.

Microstructure and Mechanical Properties of Brazed Joints Used in Electronic Devices

2014 ◽  
Vol 936 ◽  
pp. 1671-1675
Author(s):  
Xue Rui Wu ◽  
Wen Qing Qu ◽  
Hai Tao Li
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Grain Boundary ◽  
Tensile Test ◽  
Filler Metal ◽  
Electronic Devices ◽  
Nickel Content ◽  
Microstructure And Mechanical Properties ◽  
Brazed Joints ◽  
Content Alloy

The microstructure and mechanical properties of brazed joints of oxygen-free copper and oxygen-free copper, nickel-plated kovar, monel, nickel-plated stainless steel were respectively studied by using AgCu28 and AuCu20 filler metal. Effects of different filler metal on microstructure of the brazed joints were analyzed through metallurgical microscope, SEM, EPMA. The brazed joints tensile strengths were analyzed through tensile test. The results indicate that the brazing process of oxygen-free copper and nickel content alloy used AgCu28 filler metal, nickel element is easy to diffused into AgCu28, AgCu28 filler metal with nickel element wetting spreadability along grain boundary of the oxygen - free copper, resulting in the penetration of the grain boundary of the oxygen-free copper. The joints brazed by AuCu20 filler metal have the better performance than the joints brazed by AgCu28 filler metal.

scholarly journals Effect of Interfacial Intermetallic Compounds Morphology on Mechanical Properties of Laser Brazing of Aluminum to Steel

2021 ◽  
Vol 59 (9) ◽  
pp. 640-651
Author(s):  
Kwang-Hyeon Lee ◽  
Su-Jin Lee ◽  
In-Duck Park ◽  
Kwang-Deok Choi ◽  
Chung-Yun Kang ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Laser Power ◽  
Joint Strength ◽  
Filler Metal ◽  
Peak Load ◽  
Base Material ◽  
Joint Interface ◽  
Laser Brazing ◽  
Monoclinic Crystal ◽  
Zone Formation

The paper provides experimental details of the welding and specific examples of welding aluminum welding battery cans and conductive tabs for battery pack manufacture. In this study, we provide experimental details of a process for joining dissimilar materials used in sealing battery parts. A laser brazing technique was used for the lap joining of aluminum alloy and a deep drawing quality stainless steel, with an Al-Si filler metal. These materials are commonly used in battery applications, as materials for the cap plate, tab plate and can. The relationships among the width of the brazed zone, formation of intermetallic compounds (IMCs), shape of the joint interface, and joint strength were systematically investigated with respect to the laser power and filler wire feeding rate. When a low and medium laser power (1.2-2.0 kW) was applied, the joint strength was very low, and fracture occurred across the band-shaped IMC layer. With a further increase in the applied laser power (2.2-2.8 kW), a new needle-like IMC composed of Al13Fe5 with a monoclinic crystal structure was formed, and it penetrated the brazed zone. In addition, the width of the brazed zone increased due to the partial melting of the aluminum. The joint efficiency under a high laser power condition was 70% compared to that of the base material. Fractures occurred alternately along the needle-shaped IMC and filler metal zone. Since the fracture propagated along the needle-like IMCs inside the brazed zone, the peak load was higher than that of the band-shaped IMCs.

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