METALLURGY II

• Anyone involved in the design, fabrication, or inspection of welded, brazed, or soldered joints
• Anyone wishing to learn about, and how to manipulate, the crystal structure of metals
• Anyone seeking to prepare for the AWS Certified Welding Inspector exam
  • This student body may encompass many positions, including:
    • Welders
    • Welding engineers
    • Welding inspectors
    • Welding supervisors
    • Shop owners

Prior to taking this course, students should be familiar with basic welding processes and welding terminology. This prerequisite knowledge can be obtained by: 

• Taking the AWS Welding Fundamentals I online course 
• Obtaining and reading a copy of AWS A3.0 Standard Terms and Definitions 
• Successfully completing the Metallurgy I course 

This course teaches students how to:

• Explain crystal structures and grain growth
• Describe how metals interact through solubility and diffusion
• Extract information from phase, TTT, and CCT diagrams
• Explain the need for heat treatments and stress relief
• Differentiate between plastic and elastic deformation
• Explain how a material’s thermal characteristics affects is weldability

Upon completion of Metallurgy II, students will be able to:

•  Identify and describe the common crystal structures of metal
•  Explain metal solidification and grain growth
•  Differentiate between solid solubility and diffusion
•  Describe substitutional and interstitial alloying
•  Explain the diffusion process
•  Describe microstructure, phases, and phase transformation
•  Cite basic information about a given material utilizing a phase diagram
•  Identify the components of an iron-carbon phase diagram
•  Describe the process of phase transformations as an iron-carbon alloy is heated and cooled
•  Cite the difference between TTT and CCT diagrams
•  Define force, stress, strain, deformation, and failure
•  Identify and describe the five basic kinds of stress
•  Differentiate between plastic and elastic deformations
•  Calculate stress and strain and Young’s modulus
•  Identify the physical properties of a metal that impact heat flow
•  Differentiate metals with high and low thermal conductivity
•  Explain the relationship between heat and density
•  Discuss how atomic mass influences a material’s specific heat capacity
•  Discuss the factors that influence thermal diffusivity
•  Describe the heat affected zone and explain how it correlates with the iron-carbon phase diagram
•  Explain how heat input, preheat, carbon equivalent, base metal thickness, and cooling rate affect the heat affected zone
•  Describe the various heat treatments used in welding
•  Compare the efficacy of different quenching mediums
•  Define thermal expansion and residual stress
•  Describe the main types of welding distortion
•  Cite techniques to reduce distortion and residual stress
•  Identify the principal elements of stainless steel and their roles
•  Identify and describe the five types of stainless steel
•  Describe how to prevent sensitization and hot short cracking in austenitic stainless steel
•  Explain metallurgical concerns that should be considered when welding stainless steel, aluminum, and copper

• Module 1 – The Structure of Metals and How It Forms
• Module 2 – Alloying, Diffusion, and Solid Solubility
• Module 3 – Phase Diagrams I: Introduction to Phases and Phase Diagrams
• Module 4 – Phase Diagrams II: Iron-Carbon Phase Diagram
• Module 5 – Mechanical Properties of Metal
• Module 6 – Thermal Characteristics I: Thermal Conductivity and Density
• Module 7 – Thermal Characteristics II: Specific Heat and Thermal Diffusivity
• Module 8 – Metallurgical Considerations for Welding and Heat Treatments
• Module 9 – Heat Treatments
• Module 10 – Residual Stress, Distortion, and Stress Relief
• Module 11 – Stainless Steel, Aluminum, and Copper