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Understanding Welding Symbols (Udemy.com)

How to Create and Interpret the Graphical Symbols Used to Define a Welded Joint

Created by: Ray Harkins

Last updated May 2026

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What you will learn

  • An Overview of the Major Welding Processes including FCAW, SAW, SMAW, GTAW and GMAW
  • A Detailed Explanation of Joint Types and Terminology
  • Parts of a Welding Symbol: Reference Lines, Arrows and Tails
  • Groove Weld Terminology including Groove Shapes and their Associated Symbols
  • A Deep Dive into Fillet Welds -- Their Applications and Symbols
  • An Overview of Plug, Slot and Stud Welds
  • Nondestructive Testing Types and How to Depict Those Tests on an Engineering Drawing
  • Supplementary Information and Symbols
  • And MUCH MORE!!

How it compares

Against the other 335 rated Udemy courses in Engineering on CourseDuck:

  • Rating4.6 out of 5higher than 74% of them
  • Reviews788#108 of 336 by number of reviews
  • Length3.2 hoursshorter than 69% of them
  • Last updatedMay 2026more recently than 80% of them

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Course Description

Welding symbols are the graphical tools, placed on engineering drawings and specifications, that product engineers and designers use to communicate the intent of their design to the people who are making and inspecting the products. Details like the type, shape, length, thickness, and location of the weld are all communicated through these welding symbols.

And like all symbols, without an understanding of how they work, they're meaningless. But in this course, "Understanding Welding Symbols", we show you how to read and interpret these symbols.

Metallurgist and Licensed Professional Engineer, Garry Pace is the instructor for this course. Over the past 20+ years, Garry has taught thousands of welders, weld inspectors, quality engineers, quality technicians, and other manufacturing professionals the fundamentals of welding, along with its procedures and specifications.

In this course, you will learn:

  • An overview of the major welding processes like GTAW, GMAW, SMAW, SAW and FCAW

  • All the major weld joint types

  • Welding symbols ... what they mean and why they're important

  • All the terminology and concepts needed to master welding symbols

  • How groove and fillet welds are specified and dimensioned

  • How plug, slot, and stud welds are specified and dimensioned

  • Supplementary information and symbols

  • An overview of nondestructive testing methods like ultrasonic, liquid penetrant, x-ray, and magnetic particle inspection

  • How required NDT methods are specified on blueprints

  • Overviews on weld pass types, weld penetration, joint and edge preparation, and pre- and post-heat treating.

Plus 14 downloadable resources including:

  • Introductory Guide to SMAW

  • SMAW Process Study Guide

  • Introductory Guide to GMAW

  • GMAW Process Study Guide

  • GTAW Process Study Guide

  • Welding Symbol Chart

  • Weld Joint Types – Quick Study Guide

  • Basic Elements of a Welding Symbol

  • Key Parts of a Welding Symbol

  • Reference Line and Arrow Study Guide

  • Fillet Weld Symbols and Dimensions

  • Groove Welds - Study guide

  • Plug, Slot and Stud Weld Symbols - Study guide.

  • NDE Introduction

We've included in this course far more than just the dry theory. We've included real-life examples and practical applications that can only be learned through years of hands-on experience.


Read what have past students said about Understanding Welding Symbols:

"Very comprehensive but digestible for a beginner - the repetition of key concepts throughout helped drill them down properly." - Thomas M.

"I really enjoyed this course, it is both funny and informative. Great job!" - Filip M.

"Good overview and reference course on welding symbols." - Rober U.

"I have learned more and got many new ideas to apply welding in mfg, drawings. Thanks." - Ramesh M.

So if you're looking to take your welding and metal working skills to the next level by incorporating the more technical aspects of your profession, then this is the class for you.

Sign up today to advance your skillset and advance career in manufacturing!!

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Instructor Details

Ray Harkins

Ray Harkins is a senior manufacturing leader, educator, and founder of The Manufacturing Academy, with more than 30 years of experience in manufacturing engineering, quality engineering and management, and operations leadership. He currently serves as a General Manager in manufacturing, overseeing operations, quality, engineering, and continuous improvement while remaining actively engaged in solving the day-to-day challenges faced by manufacturers.

After beginning his career in manufacturing engineering, Ray expanded into quality and operations leadership, working alongside leading industry professionals throughout North America and Japan and touring hundreds of manufacturing facilities. These experiences shaped his belief that manufacturing professionals deserve practical training that they can immediately apply to improve quality, productivity, and their careers.

That philosophy has guided the development of more than 60 online courses covering Lean Six Sigma, Statistical Process Control, Supply Chain Analytics, Manufacturing Leadership, Reliability Engineering, and Operations Management. His courses are used by individual professionals and corporate training departments worldwide and have helped more than 140,000 students build practical skills and advance their careers.

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Reviews

4.6

788 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Johnjames Miller on 5/17/2026

I went to welding school (didn't finish it, but I hope to return.) This is a portion of what I didn't get a chance to learn in school. Yes, it might be better to learn in school, but at least I am learning and earning. I look forward to learning more from these presentations.

By Brendan Walker on 3/7/2026

Currently in a trade school for welding and building my knowledge before hopping out into the field. I will say I took this course just to compare it to the course I went through in school. The only difference is that in our school, of course, we were able to go out into the shop and weld out what was shown in the symbol. That's the only difference; everything in this course is exactly what we learned in the short classroom portion we would sit in each day. Good work, and if I wanted to learn welding symbols and such without going to school, this is definitely the go-to.

By Terrell Robinson on 10/7/2025

This video was very informative. I was able to follow with the visual aids and tools to assist you with sort of a hands on, in the field type of feel as if you were ready for a practical test for certification. I am an electrical and I feel that I have enough knowledge to start "OJT".

By Anonymized User on 8/25/2025

There's definitely some good information here, but the structure and editing was odd. It wasn't organized in a coherent fashion, with sections often including slides about things that didn't really fall under that heading, and there was minimal effort put towards verbally connecting everything. There were also numerous times where the exact same point would be addressed in two different places, which makes me think this was edited together from different lectures and with many slides being copied from elsewhere. Also, coming to this course as a design engineer, I wish there was more discussion on how to select which welding symbol to use and why each is used.

By Shauna Akers on 5/9/2025

As an estimator in training, this helped me put some things together that hadn't clicked or been explained to me on the job. I highly recommend it for anyone working for or with drawings that contain weldments. Thank you!

By Steven Swales on 12/20/2024

This course provided me with the course content and information that I was expecting and it was generally well delivered, however the main area that could be improved is that there was a lot of duplication of content within the sections, with some things covered 3 or 4 times. This is good for learning that content, but made the course a lot longer than it needed to be and it sometime jumped around a bit between subjects within 1 section. In general though a good course and worth doing if you want to improve your knowledge of weld symbols.

By Marcus DeRamus on 9/5/2024

Ray, YOU'RE THE BEST!! You're answering all of my questions and calmed my fears about welding. Knowing the language of welding along with dimensions will get me everywhere in the world of welding. I promise you that my first welding job will be due to what I will learn right here under your tutelage. Great job, Ray!

By Thomas Munn on 8/5/2024

Very comprehensive but digestable for a beginner - the repetition of key concepts throughout helped drill them down properly.

By Mert Çetin on 8/28/2023

Very good and detailed structure for understanding the welding symbols and arc welding methods. I have 2 feedbacks about the course. First one, it will be useful to have a quize about symbols sections and secondly during the GMAW course, it is mentioned as MIG regardless of the gas type but if there is a mixture gasses of active gas and inert gas such as Argon and Co2, it is called MAG: Metal Active Gas Welding.

By Mark Christian Maier on 8/8/2023

The instructor is very knowledgeable. The content is good and is great for future reference. There is a small mistake in one of the slides: Pg 3 section 10 is shown in error (the instructor instructs correctly but the visual does not agree with the instructor), It also does not agree with the correct slid in 4-6 section 9. Removing Pg 3 would be a simple fix and would help avoid some confusion. (I am bringing this up as a small thing) having said that, I would encourage anyone to take this class. You will probably learn some new things and/or be reminded of some old things. :)

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Overall Score : 92 / 100