Robert Marrero Jr. P.E.

Robert Marrero Jr. P.E.

Washington, District of Columbia, United States
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About

I am a licensed Professional Engineer in Mechanical Engineering and I have completed a…

Activity

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Experience

  • U.S. Coast Guard Graphic

    U.S. Coast Guard

    Washington DC-Baltimore Area

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    New Orleans, Louisiana

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    Marrero, LA

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    Elmwood, LA

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    Elmwood, LA

Education

  • University of New Orleans Graphic

    University of New Orleans

    3.8 GPA

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    Completed independent studies for the National Center of Advanced Manufacturing (NCAM) program in association with NASA, Lockheed Martin and the University of New Orleans, with direct relevance to weldment of the Orion crew space capsule.

    Friction Stir Welding Characterization of Al 2050 and Al 2219 plate for the Orion Crew Module;
    •Completed a friction stir weld experiment where the grain orientation was modified to replicate a weld actually being completed on the Orion Crew Module…

    Completed independent studies for the National Center of Advanced Manufacturing (NCAM) program in association with NASA, Lockheed Martin and the University of New Orleans, with direct relevance to weldment of the Orion crew space capsule.

    Friction Stir Welding Characterization of Al 2050 and Al 2219 plate for the Orion Crew Module;
    •Completed a friction stir weld experiment where the grain orientation was modified to replicate a weld actually being completed on the Orion Crew Module and determined test results.

    Variable insensitive Friction Stir Welding of Aluminum Alloys 2219 to 2195
    •Developed a weld schedule by varying the input (travel speed, RPM and forge force) parameters to portray trends in the mechanical strengths of different aluminum alloys typically used in aerospace structures to comply with manufacturing tolerances for welding complex geometries

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Licenses & Certifications

Publications

  • Analysis of Variable Insensitive Friction Stir Welding Parameters

    University of New Orleans

    Friction Stir Welding (FSW) was used to perform a Design of Experiment (DOE) to determine the welding parameters effects on yielding consistent mechanical properties across the length of the weld. The travel speed was varied across set forge force and RPM conditions, to find a dataset that will yield consistent mechanical properties independent of the travel speed. Six different welds were completed on two different aluminum panels, the advancing side being Aluminum alloy 2195-T8 at a thickness…

    Friction Stir Welding (FSW) was used to perform a Design of Experiment (DOE) to determine the welding parameters effects on yielding consistent mechanical properties across the length of the weld. The travel speed was varied across set forge force and RPM conditions, to find a dataset that will yield consistent mechanical properties independent of the travel speed. Six different welds were completed on two different aluminum panels, the advancing side being Aluminum alloy 2195-T8 at a thickness of .350”, with the retreating side being Aluminum alloy 2219-T851 with a gauge thickness of .360”. A Left-hand Right-hand self-reacting pin tool was used for each weld. The mechanical properties of interest are the Ultimate Tensile Strength, Yield Strength, Elasticity and Hardness. The strengths were evaluated by tensile testing, with the Elasticity being measure post break. Specimens were then polished where macrograph and micrograph analysis was completed. Micro-hardness testing was then completed on the weld nuggets.

    See publication

Courses

  • Composite Materials

    ENME 6364

  • Computational Fluid Dynamics

    ENME 4728

  • Finite Element Methods in Engineering Analysis

    ENME 6028

  • Friction Stir Welding

    ENME 5097

  • Gas Dynamics

    ENME 5721

  • Intermediate Heat Transfer

    ENME 5771

  • Internal Combustion Engines

    ENME 4772

  • Systems Engineering

    NAME 6080

  • Theory of Elasticity

    ENME 6354

  • Theory of Plates and Shells

    ENME 6355

  • Turbomachinery

    ENME 4722

Projects

  • Friction Stir Welding Characterization of 2050 and 2219 plate

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    It is well known in the aerospace community that aluminum-lithium alloys possess some of best specific strength and specific stiffness properties among metals. Early generations of aluminum-lithium alloys were restricted to plate sections less than 2” thick and possessed highly anisotropic microstructure. AIRWARE 2050 is a 3rd generation aluminum-lithium alloy that is produced in significantly thicker sections and has a mature mechanical properties database. The database includes mechanical…

    It is well known in the aerospace community that aluminum-lithium alloys possess some of best specific strength and specific stiffness properties among metals. Early generations of aluminum-lithium alloys were restricted to plate sections less than 2” thick and possessed highly anisotropic microstructure. AIRWARE 2050 is a 3rd generation aluminum-lithium alloy that is produced in significantly thicker sections and has a mature mechanical properties database. The database includes mechanical properties for the short transverse (i.e. through the thickness) grain orientation which was poorly understood in early-generation aluminum-lithium alloys. The data available on 2050 weldments using friction stir welding (FSW) are very limited, especially in grain directions that follow the short transverse. Lockheed Martin sponsored research by students from the University of New Orleans and Louisiana State University in conjunction with the National Center for Advanced Manufacturing (NCAM) to conduct a series of FSW trials on 2050-to-2219 using self-reacting FSW pin tools. The 2219 material, representing the cone section of the Orion Command Module, was welded along the longitudinal grain direction. The 2050 material, representing the forward bulkhead of the Orion Command Module, was welded in the longitudinal gain direction as well as the Longitudinal-45 degree-Short Transverse (L-45-ST) grain orientation. This orientation is of particular interest to the Orion program because the 2050 material would be welded in this grain orientation if it were implemented on the vehicle. Implementing 2050 on the Orion Command Module is of great interest since it could lead to significant mass savings over the current 2219 alloy. This presentation will report the results of FSW trials on 0.320” thick 2050-to-2219 plates with the 2050 configured in two different grain orientations. The differences in FSW mechanical properties between the two 2050 grain orientations will be highlighted.

    See project

Honors & Awards

  • Dean's List

    University of New Orleans

  • Decennial Scholarship - University of New Orleans

    University of New Orleans - Admissions Awards

Languages

  • English

    Native or bilingual proficiency

Organizations

  • American Society of Naval Engineers

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    - Present

  • Society of Naval Architects and Marine Engineers

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