Mechanical Engineering

STEFANO NATALI

The course provides knowledge about the origin and control of defects in metal structures, from the manufacture of materials or processing technologiesFor their control are called the basic physical principles and applied methods: radiography, ultrasonic, penetrant liquid and magnetic methods.

At the end of the course the students will be able to
1) evaluate the genesis, chemical composition and morphology of the main defects that can arise as a result of the main production methods of mechanical components
2) to characterize the defects through suitable non-destructive tests

an adequate knowledge of mechanical metallurgy is recommended

Defect in foundry: calls on casting system, non- metallic inclusion,
oxide film, expansion defects, gas defects, metal- form reactions,
cavity of retirement, hot cracks, distortion and residual stresses,
segregations
Welding Metallurgy
presentation of the welding processes Macrography presentation of a welded joint
melted zone, bond zone , HAZ, processing melted zone, behavior of
elements in the fuse zone; hydrogen in welding; slag’s functions,
solidification structures; blowholes and cracks in the melted area,
thermal cycle and thermal repartition,
sensitization.Weldability.Non-destructive testing: Liquid penetrant
inspection UNI EN 1289:2006; Ultrasonic Non-Destructive Control UNI EN
10228-3:2000; Magnetic controls UNI EN 1330-7:2005 UNI EN ISO
9934-1:2004; Eddy current controls UNI EN 12084:2004; X-Ray (radiograph
and diffractometry).

Le prove non distruttive – edizioni AIM

The course is delivered in presence

Attendance, optional, takes place according to the classrooms and times established by the Presidency. Attendance, although strongly encouraged, does not contribute to the final evaluation

The assessment is based on the results of an oral interview, aimed at verifying the acquisition:
To obtain the highest marks (30/30 cum laude) the student must demonstrate that he has acquired an excellent knowledge of all the topics covered in the course, and that he can apply this knowledge to the solution of problems in the field of industrial engineering, proposing original solutions and demonstrating that they have deepened the study of the subject individually and with personal contributions.

• The course
  includes the study and analysis of methods for determining the presence of
  defects in structural components made of metallic materials.
  
  The first
  part of the course analyzes the "genesis" of defects based on the
  manufacturing methodology of the structural element, with particular attention
  to foundry, welding, and protective coating processes.
  
  The second
  part analyzes non-destructive methods for determining the presence of defects,
  with particular attention to visual, penetrant, magnetic, and ultrasonic
  testing.
  
  The third
  part describes and implements metallographic techniques suitable for
  characterizing the crystalline grain size of metallic materials.