(Your Complete Guide to NIMI Welder Trade Practical Book)

Every building, ship, and machine in the world needs welding. But becoming a master welder isn't just about striking an arc; it’s about understanding every joint, every position, and every technique that transforms metal into strength.

The Welder Trade Theory Book helps you learn all about welding in an easy and practical way. It is made by the National Instructional Media Institute (NIMI) to train ITI students and vocational trainees to become skilled and job-ready welders.

Developed by the National Instructional Media Institute (NIMI), this book teaches you many welding methods like gas welding, SMAW, GMAW, GTAW, and even advanced processes like plasma arc cutting and resistance welding. Each topic is explained with simple language, clear pictures, and real workplace examples.

WHY THIS BOOK IS IMPORTANT:

Welding is not just a job — it is a skill that requires practice, safety, and deep knowledge.

The NIMI Welder Trade Theory Book helps you learn all of this with ease.

Inside the NIMI Welder Trade Theory Book:

This book includes 7 detailed modules that take you from the basics to advanced welding mastery.

Module 1: Induction Training & Welding Process

● Trade discipline, first aid, and safety
● Arc & gas welding tools and accessories
● Welding joints, edge prep, and fit-up
● Basics of electricity, arc principles, and gas types

This module builds your foundational understanding of welding safety, equipment, and principles — essential before touching any welding machine.
Module 2: Welding Techniques

● AC/DC welding machines, maintenance, and polarity
● Welding positions, symbols, slope, and rotation

Every great welder is like an artist — but instead of a brush, you’ve got a torch! Mastering welding positions and machine tuning helps you create perfect joints every time.Once you master these techniques, reading blueprints will feel like reading a recipe—and your welds will look (and hold) like a pro’s.
Module 3: Weldability of Steels (OAW, SMAW)

    ●    Weld defects, causes, and remedies

    ●    Electrode types, coding, and baking

    ●    Pipe welding and gas welding systems

Not all metals are created equal — some love the heat, others crack under pressure! This module helps you understand how different steels behave when welded, so you can fix problems before they even happen.
Module 4: Inspection and Testing

    ●    Destructive and NDT methods (Dye Penetrant, Magnetic Particle, Bend Tests)

    ●    Welding economy and cost estimation

No one wants a bridge that bends or a pipe that leaks! This module turns you into a welding detective — you’ll learn how to spot cracks, defects, and weak spots before they become disasters.
Module 5: Gas Metal Arc Welding (GMAW)

    ●    MIG/MAG welding equipment, process variables, and defects

    ●    Flux-Cored and Submerged Arc Welding principles

Ever wondered how cars, ships, and skyscrapers stay welded together so perfectly? That’s GMAW in action — fast, clean, and super efficient. Mastering this modern technique is like adding turbo boost to your welding career.
Module 6: Gas Tungsten Arc Welding (GTAW)

    ●    TIG welding with AC/DC power sources

    ●    Tungsten electrodes, torches, shielding gases, and heat control

GTAW (TIG) is the most precise welding method — important for aerospace, medical devices, and high-end fabrication work.
Module 7: Repair and Maintenance

    ●    Hard-facing, surfacing, metallizing, and plastic welding

    ●    WPS, PQR, and assembly drawing reading

Things break — and that’s where you step in as the hero! This module teaches you how to bring worn-out machines and tools back to life.
After completing this book, you’ll be able to:

➤ Set up and operate gas welding and SMAW machines safely.

➤ Perform various joints and cuts on MS sheets and pipes.

➤ Conduct inspection and testing using NDT methods.

➤ Work confidently on GMAW and GTAW setups.

➤ Apply welding codes, safety procedures, and maintenance techniques in workshops.

 

Who Should Use This Book?

✔ ITI Students – enrolled in Welder Trade.

✔ Vocational Trainees – learning welding & fabrication.

✔ Working Welders – upgrading to advanced processes.

✔ Entrepreneurs – starting fabrication workshops.

✔ Engineering Students – studying manufacturing or metal joining.

Shape Your Future with the NIMI Welder Trade Theory Book

Your welding journey begins here. The NIMI Welder Trade Theory Book is more than just a manual — it’s your path to building skills, confidence, and a strong career. 

Each page guides you through real workshop tasks, safety habits, and welding processes used in the industry. You’ll not only learn how to weld — you’ll learn how to work like a pro. 

🛒 Get your copy from the official NIMI website and take the first step toward your future in welding.

From basic sheet metal joints to advanced TIG and pipe welding, everything you need is inside.

Learn with purpose. Weld with pride. Skill up with NIMI.