Metallurgy II


Member: $194
Non-member: $259

Access to Course Materials

Course – 30 days
Exam – 10 more days

Course Length & Earnings

Approximately 6 hours
6 PDHs / 0.6 CEUs


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Metallurgy II
Metallurgy II

Who should take this course?
  • Anyone involved in the design, fabrication, or inspection of welded, brazed, or soldered joints
  • Anyone wishing to learn how to decipher welding symbols and prints
  • Anyone seeking to prepare for the AWS Certified Welding Inspector exam
  • Anyone seeking to prepare for the AWS Certified Welding Inspector exam

This student body may encompass many positions, including:

Welding engineers
Welding inspectors
Welding sales reps
Welding supervisors
Shop owners


While no prior courses are necessary to fulfill prerequisite level knowledge, we advise novice students to take our Welding Fundamentals I course to become more familiar with welding terminology.


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
The nature of metals and the properties that affect weldability

Welding involves various metallurgical phenomena, including melting, freezing, diffusion, precipitation, thermal strains, and shrinkage. If disregarded or misunderstood, these effects can lead to cracking, porosity, or welds with poor properties.

This course builds on the fundamental principles described in Metallurgy I to provide a basic understanding of the nature of metals, the metallurgical phenomena involved in welding, and the effects of these phenomena on the properties of welded materials. Click on the Course Modules tab below to see a list of the topics covered.

The American Welding Society is accredited by the International Association for Continuing Education and Training (IACET) and is accredited to issue the IACET CEU.

Student Learning Outcomes

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


Approximately 6 hours of instruction divided into 11 easily manageable modules.

Participants can access the course 24/7 from any computer with an internet connection.

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Pause, advance, and rewind navigation features give users complete control over their learning experience.

Audio narration, animated graphics and video footage make even the most complex topics engaging and easy-to-understand.

Interactive elements, practice problems, and quizzes facilitate the mastery of concepts and measure content retention.

Course content was developed by industry experts and AWS learning professionals.

Users can speak to an AWS instructor during the optional weekly question and answer teleconference.

AWS customer support Monday through Friday 7:30 AM to 5:00 PM EST.


MODULE 1 – Atoms, Unit Cells, and Crystal Structures

MODULE 2 – Alloys, Diffusion, and Solid Solubility

MODULE 3 – Phase Diagrams Part I

MODULE 4 – Phase Diagrams Part II

MODULE 5 – Physical and Mechanical Properties

MODULE 6 – Thermal Characteristics: Thermal Conductivity and Density

MODULE 7 – Thermal Characteristics: Specific Heat and Diffusivity

MODULE 8 – Metallurgical Considerations for Welding

MODULE 9 – Heat Treatments

MODULE 10 – Stresses and Stress Relief

MODULE 11 – Welding Metallurgy of Common Materials


How much do I need to know before taking this course?

To get the most out of this course, it is helpful to understand the basic principles that underlie the broad field of metallurgy. These include the characteristics of atoms, the periodic table, chemical bonding, chemical reactivity, the atomic structure of materials, and the properties of metals. These topics are covered in the AWS online course, Metallurgy I.

Who should take this course?

This course is ideal for both students and professional who want to learn or reacquaint themselves with the nature of metals, the metallurgical phenomena involved in welding, and the effects of these phenomena on the properties of welded materials.

How long do I have to complete this course?

Participants have access to the course content 24 hours a day for a period of 30 days from the date of registration. After this 30-day period, participants will have an additional 10 days to pass the completion exam. The exam can be activated before the end of the 30-day period if the participant has completed all the modules.

Does this course include a completion exam?

Yes. Upon completion of the final course module, participants are prompted to take an exam designed to evaluate their comprehension of the subject matter. The completion exam consists of 50 multiple-choice questions and must be completed within a 90 minute period. Participants who do not attain the 75% passing score may attempt to retake the exam a second time. Participants who attain a score of 75% or more on the completion exam earn an AWS Certificate of Completion and 6 Professional Development Hours (PDHs). The AWS Certificate of Completion can be downloaded and printed directly from the webpage.

Do I need to purchase any other materials?

No. All the materials and resources necessary to complete the course objectives are included.

Do I receive Professional Development Hours (PDHs) for completing this course?

Yes. Participants that receive a score of 75% or above on the Completion Exam will receive an AWS Certificate of Completion and 6 Professional Development Hours (PDHs).

Can I use these Professional Development Hours (PDHs) for recertification?

Yes. Professional Development Hours (PDHs) earned through AWS online courses can be applied towards recertification provided the PDH’s are earned during the certification period.

Do I receive Continuing Education Units (CEUs) for completing this course?

IACET Accredited - AWS LearningYes. Participants that receive a score of 75% or above on the Completion Exam will receive an AWS Certificate of Completion and 0.6 IACET Continuing Education Units (CEUs).
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Can I use these Continuing Education Units (CEUs) for recertification?

IACET Accredited - AWS LearningYes. Continuing Education Units (CEUs) earned through AWS online courses can be applied towards recertification provided the CEUs are earned during the certification period.
Learn More >

Will this course help prepare me for the Certified Welding Inspector Exam?

Yes. The Certified Welding Inspector Fundamentals Exam (Part A) contains questions concerning the topics covered in this seminar. This course is designed to help prepare participants for this section of the exam.

What platforms and devices can I use to view AWS Learning online courses?

You must be connected to the internet to access AWS Learning online courses. AWS supports the most recent versions of Google Chrome, Firefox, Safari, and Internet Explorer. Courses can be viewed on desktops, laptops, tablets, and mobile phones. Note, however, that a high speed internet connection and large screen offer a better user experience.


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