Microstructures and mechanical properties of copper-stainless steel butt-welded joints by MIG-TIG double-sided arc welding

Cheng, Zhi; Huang, Jihua; Zheng, Yi; Chen, Yu; Yang, Jian; Chen, Shuhai

doi:10.1016/j.jmatprotec.2018.10.007

Cited by 77 publications

(20 citation statements)

References 22 publications

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“…The residual copper will be more pure than the original sheet (Table 1) and the principal alloying element will be Ni (up to 1.3 %wt.). This phase segregation could be hazardous to the mechanical properties as long a line of residual Cu liquid could give rise to hot spots, as pointed out by Cheng et al (2019).…”

Section: Chemical Modulationsmentioning

confidence: 99%

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

Carvalho¹,

Siqueira²,

Lima³

2019

J.Aerosp. Technol. Manag.

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Stainless steel and copper alloys joints are often applied in aerospace, marine and power industries where both high thermal and electrical conductivity (Cu) and corrosion resistance (steel) are required. In the aerospace industry, in particular for the combustion chamber of rocket engines, copper and steel combinations offer perfect materials selection due to their combined high thermal conductivity and good stiffness. In this work, laser welds were produced with intensity between 3.8 × 104 and 5.7 × 104 W/mm2 and a heat input between 72 and 108 J/mm, giving an aspect ratio of 1.8. The microstructure of the weld beads was marked by chemical heterogeneities due to the phase separation between Cu and Fe in the liquid state. The phase separation gave rise to globular precipitates which further transform due to a secondary precipitation at temperatures below 1000 °C. The steel side part of the weld presents around 20% Cu, leading to a liquation of the grain boundaries and cracking at high heat inputs. The hardness values situated between both base materials and the tensile shear behavior, when the weld is sufficiently tough, present strength up to 350 MPa and elongation up to 10%.

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Section: Chemical Modulationsmentioning

confidence: 99%

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

Carvalho¹,

Siqueira²,

Lima³

2019

J.Aerosp. Technol. Manag.

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“…Nowadays, Cu/SS joints have been widely used in the nuclear, petrochemical, and chemical industries. Although no brittle intermetallic compounds are formed between Cu/SS, the physical and chemical properties of Cu and SS are quite different (especially melting point and thermal conductivity), resulting in metallurgical challenges with Cu/SS joints [ 1 ]. Previous research showed that during welding, poor welds could be formed due to rapid heat loss, which was caused by the large thermal conductivity of copper [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

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

Cui

et al. 2021

Materials

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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.

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“…The TIG-MIG hybrid process had a higher welding speed than the MIG welding process. Cheng et al (2019) achieved strong connections between copper and stainless steel joined by MIG-TIG double-sided arc welding. All the joints failed in a ductile manner at the copper side of the weldments and this shows that the joints were stronger than the parent copper plates.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of process parameters in TIG-MIG welded AISI 1008 steel for improved structural integrity

Abima

Akinlabi

Madushele

et al. 2021

Int J Adv Manuf Technol

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This study investigates a parametric multi-objective optimization of the Tungsten Inert Gas-Metal Inert Gas (TIG-MIG) hybrid welding of AISI 1008 mild steel joints. A combined grey relational system theory and the Taguchi method was used for process optimization towards achieving a set of process parameter that maximizes both ultimate tensile strength and 0.2% yield strength for structural applications. An L-9 orthogonal array based on the Taguchi method was adopted for the experimental design matrix. Grey relational grading system was used to establish a single grade for the responses.Mathematical models for first and second-order regression were developed and optimum process parameters combination that optimizes the response were obtained. From the results, the gas flow rate had the most significant influence on the responses with a percentage contribution of 39.77%. Also, the second-order regression models had a higher coefficient of determination (R 2 ) compared to the firstorder regression for the two responses and thus, represents the best fit for the process. The grey relational grade was improved by 0.0489 through process optimization. The interactive effects of process parameters and their effects on the responses are also illustrated by response surface plots. This study shows the effectiveness of the grey relational grading system in achieving a multi-objective optimization for the TIG-MIG welding process.

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Microstructures and mechanical properties of copper-stainless steel butt-welded joints by MIG-TIG double-sided arc welding

Cited by 77 publications

References 22 publications

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

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

Multi-objective optimization of process parameters in TIG-MIG welded AISI 1008 steel for improved structural integrity

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