Md. R. U. Ahsan
Tennessee Technological University
BeadSpot weldingUltimate tensile strengthFiller metalViscosityFerrite (iron)Vickers hardness testBrittlenessFabricationHeat-affected zoneInfraredSlag (welding)Composite materialIndentation hardnessCastingShielded metal arc weldingComposition (visual arts)Fusion weldingElectrodeOffset (computer science)Shielding gasTensile testingMartensiteMetallurgyMaterials scienceWeldingArc weldingSuperalloyScanning electron microscopeTool steelInconel 625Weld poolScientific methodCarbon steelThermographyAustenitic stainless steelAlloyElectron backscatter diffractionRange (particle radiation)Metal transferHeat generationMaterial propertiesStackingGas tungsten arc weldingBimetallic stripElectric resistance weldingGas metal arc weldingChromiumCarbideZincDuctilityPorosityAnnealing (metallurgy)Arc (geometry)MicrostructureSurface tensionLaser beam weldingRadiant energyAustenite
12Publications
5H-index
109Citations
Publications 12
Newest
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Gi-Jeong Seo (Tennessee Technological University)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 7 authors...
Abstract null null The goal of this study is to investigate the wire + arc additive manufacturing (WAAM) of a high-entropy alloy (HEA) and to identify the near-optimal process parameters. To achieve the goal, a two-stage investigation is attempted using pre-alloyed and extruded Al0.1CoCrFeNi wire. In the first stage, single-layer beads are deposited with a range of process parameters (current, wire feed speed, and travel speed). Through process-signal monitoring, bead cross-section measurements,...
Source
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Xuesong Fan (UT: University of Tennessee)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 8 authors...
Abstract Bimetallic additively manufactured structures (BAMSs) can replace traditionally-fabricated functionally-graded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding (GMAW)-based wire + arc additive manufacturing (WAAM) system. Elemental mapping shows a smooth compositiona...
7 CitationsSource
#1A. N. M. Tanvir (Tennessee Technological University)H-Index: 4
#2Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 10 authors...
Abstract Wire + arc additive manufacturing (WAAM) is considered an innovative technology that can change the manufacturing landscape in the near future. WAAM offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium- and large-sized parts such as die-casting tools. In this study, AISI H13 tool steel, a popular die-casting tool metal, is manufactured by cold metal transfer (CMT)-based WAAM and is then comprehensively analyzed for its microstructural...
5 CitationsSource
#1Vijeesh VijayanH-Index: 5
#2Md. R. U. Ahsan (Dong-eui University)H-Index: 5
Last. Yeong-Do Park (Dong-eui University)H-Index: 5
view all 4 authors...
Abstract Infrared thermography technique (IRT) uses longer wavelength electromagnetic radiations emitted by a hot body to compute its temperature. The radiant energy absorbed by the thermographic system is transformed into electronic signals by sensors and into visible signals known as a thermogram. Besides highly sophisticated military applications, the non-contact infrared thermography is extensively used in medical, electrical, mechanical and many other domains. This paper exploits the infrar...
1 CitationsSource
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2A. N. M. Tanvir (Tennessee Technological University)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 10 authors...
Abstract A bimetallic additively-manufactured structure (BAMS) is a type of functionally-graded multi-material structure used for achieving different complementary material properties within the same structure as well as cost optimization. Wire + arc additive manufacturing (WAAM) offers the capability to fabricate the BAMS in a simultaneous or sequential way. To fully utilize the benefits of the BAMS, the interfacial joint should be strong, and each of the constituents should have reasonable mec...
17 CitationsSource
#1Md. R. U. AhsanH-Index: 5
#2A. N. M. TanvirH-Index: 4
Last. Duck Bong KimH-Index: 11
view all 6 authors...
Wire + arc additive manufacturing (WAAM) uses existing welding technology to make a part from metal deposited in an almost net shape. WAAM is flexible in that it can use multiple materials successively or simultaneously during the manufacturing of a single component.,In this work, a gas metal arc welding (GMAW) based wire + arc additive manufacturing (WAAM) system has been developed to use two material successively and fabricate bimetallic additively manufactured structure (BAMS) of low carbon s...
19 CitationsSource
#1A. N. M. Tanvir (Tennessee Technological University)H-Index: 4
#2Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 6 authors...
Wire + arc additive manufacturing (WAAM) is a versatile, low-cost, energy-efficient technology used in metal additive manufacturing. This WAAM process uses arc welding to melt a wire and form a three-dimensional (3D) object using a layer-by-layer stacking mechanism. In the present study, a Ni-based superalloy wire, i.e., Inconel 625, is melted and deposited additively through a cold metal transfer (CMT)-based WAAM process. The deposited specimens were heat-treated at 980 °C (the recommended temp...
19 CitationsSource
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Tae-Hoon KimH-Index: 2
Last. Yeong-Do Park (Dong-eui University)H-Index: 15
view all 5 authors...
5 CitationsSource
#1Ch. MuralimohanH-Index: 1
#2Md. R. U. AhsanH-Index: 5
Last. Yeong-Do ParkH-Index: 15
view all 4 authors...
3 Citations
#1Md. R. U. Ahsan (Dong-eui University)H-Index: 5
#2Y. R. Kim (Hyundai Motor Company)H-Index: 2
Last. Yeong-Do Park (Dong-eui University)H-Index: 15
view all 6 authors...
The porosity formation in cold metal transfer (CMT) gas metal arc welding (GMAW) of zinc coated steel is studied over a wide range of the heat inputs (160–250 J mm− 1), which shows low porosity in weld bead ( 350 J mm− 1) heat inputs and maximum at medium (250–350 J mm− 1) heat inputs. The high speed imaging of weld pool shows that the highest frequency of zinc vapour escapes at high heat inputs compared to other conditions. Numerous experiments show that size and location of pores along with es...
32 CitationsSource