Understanding Welding Symbols


Member: $300
Non-member: $400

Access to Course Materials

Course – 30 days
Exam – 10 more days

Course Length

Approximately 10 hours

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Welding Symbols

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:

  • Identify basic components of a welding print
  • Differentiate between different joint and weld types
  • Read and construct welding, brazing, and nondestructive examination symbols

Student Learning Outcomes

Upon completion of Understanding Welding Symbols, students will be able to:

Discuss the basic elements and fundamental principles of object representation

Distinguish between the different lines used on a welding print

Indicate key elements of a welding drawing

Identify common joint types and edge preparations

Correlate welds with basic joint types

Distinguish between the different types of welds and their respective symbols

Label parts of a weld

Identify the location of a weld with respect to the joint using the elements included on a print
Construct a welding symbol in order to demonstrate an understanding of print interpretation

Explain the rules governing the use of the arrow, reference line, supplementary symbols, and combined welding symbols

Describe the function and appropriate placement of supplementary data within a welding symbol

Describe a required braze by deciphering the parameters detailed within a brazing symbol

Determine the NDT method to be used by analyzing a nondestructive examination symbol

Analyze a combined welding and nondestructive examination symbol

a step-by-step guide to reading and using welding symbols

Based on the AWS A2.4:2012 Standard Symbols for Welding, Brazing, and Nondestructive Examination, this in-depth, online course employs audio narration, animated graphics, and interactive practice problems to make even the most complex welding symbols easy to understand and use. Understanding Welding Symbols is ideal for anyone involved in the design, fabrication, or inspection of welded, brazed, or soldered joints. Click on the Course Modules tab below to see a detailed list of the topics covered.


MODULE 1 – Fundamentals of Object Representation

MODULE 2 – Lines and Weld Joints

MODULE 3 – Weld Symbols: Groove, Fillet, Plug and Slot Welds

MODULE 4 – Weld Symbols: Spot and Projection, Stud, Seam, Back and Backing, Surfacing, and Edge Welds

MODULE 5 – Reading Welding Symbols: Basic Parts of a Welding Symbol, Weld Location, and Symbol Orientation

MODULE 6 – Reading Welding Symbols: Arrow, Reference Lines, and Supplementary Data

MODULE 7 – Reading Welding Symbols: Extent of Welding

MODULE 8 – Reading Welding Symbols: Tail, Contour Symbols, and Melt-Through Symbol

MODULE 9 – Groove Welds: Groove, Groove Welds, and Arrows

MODULE 10 – Groove Welds: Depth of Groove and Size

MODULE 11 – Groove Welds: Special Case Dimensions and Root Opening

MODULE 12 – Groove Welds: Groove Angle, Groove Radius, and Length

MODULE 13 – Groove Welds: Intermittent Welds and Weld Contours

MODULE 14 – Groove Welds: Back and Backing Welds

MODULE 15 – Groove Welds: Backing, Spacers, and Consumable Inserts

MODULE 16 – Groove Welds: Backgouging, Seal Welds, and Skewed Joints

MODULE 17 – Fillet Welds: Anatomy of a Fillet Weld, Size, Dimension Lines, and Notes in the Tail

MODULE 18 – Fillet Welds: Double Fillet Welds, Notes on a Print, Length, Hatching Lines, and Changes in Direction of Welding

MODULE 19 – Fillet Welds: Length and Intermittent Fillet Welds

MODULE 20 – Fillet Welds: Contours, Combined Weld Symbols, and Skewed Joints

MODULE 21 – Plug and Slot Welds: Plug Weld Size, Slot Weld Width and Length

MODULE 22 – Plug and Slot Welds: Angle of Countersink, Depth of Filling, and Number of Welds

MODULE 23 – Plug and Slot Welds: Pitch, Centerlines, and Joints with Three or More Members

MODULE 24 – Spot and Projection Welds: Size and Strength, Number of Welds, and Pitch

MODULE 25 – Spot and Projection Welds: Weld Process Reference, Grouped Spot Welds, and Multiple Member Spot Welds

MODULE 26 – Stud Welds

MODULE 27 – Seam Welds: Size, Strength, Welding Process Reference, and Length

MODULE 28 – Seam Welds: Intermittent Seam Welds, Number of Welds, Contours, and Multiple Member Seam Welds

MODULE 29 – Surfacing Welds

MODULE 30 – Edge Welds: Size, Length, Double Edge Welds, and Changes in Direction of Welding

MODULE 31 – Edge Welds: Chain Intermittent Edge Welds and Staggered Intermittent Edge Welds

MODULE 32 – Edge Welds: Extent, Location, Joints with Three of More Members, and Combined Weld Symbols

MODULE 33 – Brazing Symbols

MODULE 34 – Nondestructive Examination Symbols: Letter Designations, Side Significance, Multiple Tests, Combined Symbols, and Supplementary Symbols

MODULE 35 – Nondestructive Examination Symbols: Specifying Location and Extent of Examination Testing Symbols


Who should take this course?

Understanding Welding Symbols is ideal for anyone involved in the design, fabrication, or inspection of welded, brazed, or soldered joints.

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 10 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 10 Professional Development Hours (PDHs).

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

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

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 course. 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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