Tungsten Inert Gas TIG Welding Process Revision — Excellence, Achievement & Learning Limited Occupational Qualification

    Understand the principles of Tungsten Inert Gas (TIG) Welding, Understand Metallurgy associated with welding, Understand Welding Health and Safety, Understand equipment associated with Tungsten Inert Gas (TIG) Welding, Understand the consumables used in Tungsten Inert Gas (TIG) Welding, Understand Welding procedures and methods of testing applied to Tungsten Inert Gas (TIG)

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    Common Mistakes

    Key Marking Points

    Tungsten Inert Gas TIG Welding Process

    EXCELLENCE-ACHIEVEMENT-AND-LEARNING-LIMITED
    vocational

    This topic covers the principles of TIG welding, including metallurgy, health and safety, equipment, consumables, and testing procedures. Learners will understand how to set up and perform TIG welding safely and effectively.

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    Learning Outcomes
    13
    Assessment Guidance
    13
    Key Skills
    9
    Key Terms
    18
    Assessment Criteria

    Assessment criteria

    EAL Level 3 Certificate in Engineering Technologies
    EAL Level 3 Diploma In Engineering Technologies
    EAL Level 3 Subsidiary Diploma in Engineering Technologies
    EAL Level 3 Extended Diploma in Engineering Technologies

    Topic Overview

    The EAL Level 3 Extended Diploma in Engineering Technologies is a comprehensive vocational qualification designed to equip students with the practical skills and theoretical knowledge required for a career in engineering. This diploma covers a broad range of engineering disciplines, including mechanical, electrical, and electronic engineering, as well as manufacturing and design. It is structured to provide a deep understanding of engineering principles, materials, processes, and systems, preparing students for higher education or direct entry into the engineering workforce.

    This qualification is particularly valuable because it combines rigorous academic learning with hands-on practical experience. Students engage in projects that mirror real-world engineering challenges, developing problem-solving, critical thinking, and technical skills. The diploma is recognised by employers and universities alike, offering a clear pathway to apprenticeships, HNC/HND programmes, or degree courses in engineering. By the end of the course, students will have a portfolio of work demonstrating their competence in key engineering areas.

    Within the broader context of Design and Technology, this diploma emphasises the application of scientific and mathematical principles to design and manufacture functional products. It bridges the gap between theoretical design concepts and practical implementation, ensuring students can take a design from concept to production. This makes it an ideal choice for those who enjoy both creative design and technical problem-solving.

    Key Concepts

    Core ideas you must understand for this topic

    • →Engineering principles: Understanding forces, motion, energy, and materials behaviour is fundamental to all engineering disciplines.
    • →Manufacturing processes: Knowledge of techniques such as casting, machining, welding, and additive manufacturing is crucial for producing components.
    • →Electrical and electronic systems: Concepts like circuit theory, semiconductors, and programmable logic controllers (PLCs) are essential for modern engineering.
    • →Quality control and assurance: Students must grasp inspection methods, statistical process control, and standards like ISO 9001 to ensure product reliability.
    • →Project management: Skills in planning, budgeting, and resource allocation are vital for delivering engineering projects on time and within scope.

    What You Need to Demonstrate

    Key skills and knowledge for this topic

    • Explain the TIG welding process and its applications.
    • Identify appropriate consumables for different materials.
    • Describe health and safety precautions for TIG welding.
    • Explain methods of testing welds for quality.
    • Explain the principles of TIG welding and its applications.
    • Understand metallurgy related to welding, including heat-affected zones.
    • Identify and use appropriate TIG welding equipment and consumables.
    • Apply welding procedures and testing methods to ensure quality.

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Explain the TIG welding process and its applications.
    • Identify appropriate consumables for different materials.
    • Describe health and safety precautions for TIG welding.
    • Explain methods of testing welds for quality.
    • Explain the principles of TIG welding and its applications.
    • Understand metallurgy related to welding, including heat-affected zones.
    • Identify and use appropriate TIG welding equipment and consumables.
    • Apply welding procedures and testing methods to ensure quality.
    • Award credit for correctly identifying and describing the function of each component in a TIG welding torch and power source setup.
    • Award credit for accurately explaining the purpose of pre- and post-flow gas timings to prevent weld oxidation.
    • Award credit for demonstrating the ability to select the correct tungsten electrode type and size for a given material thickness and current.
    • Award credit for producing a risk assessment that addresses fume extraction, flammable materials, and electrical safety specific to TIG welding.
    • Award credit for performing a visual inspection and identifying common weld defects such as porosity, lack of fusion, or undercut, referencing acceptance criteria.
    • Explain the TIG welding process and its advantages.
    • Describe metallurgical changes during welding (e.g., HAZ).
    • Identify health and safety hazards and control measures.
    • Select appropriate equipment and consumables for different materials.
    • Describe welding procedures and testing methods (e.g., visual, NDT).

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Memorise common defects and their causes.
    • 💡Understand the role of filler rods and shielding gases.
    • 💡Relate metallurgy concepts to welding outcomes.
    • 💡Know the colour codes for tungsten electrodes.
    • 💡Practice setting gas flow rates and amperage.
    • 💡Understand common weld defects and their causes.
    • 💡In written assessments, ensure you can differentiate between DCEN (Direct Current Electrode Negative) and AC applications, explaining the cleaning action of AC on aluminium.
    • 💡For practical tasks, always refer to the WPS and follow the specified parameters; assessors will check your adherence to set procedures and safety protocols.
    • 💡When answering metallurgy questions, relate the heat input and cooling rate to grain structure changes, using correct terminology like 'martensite formation' in carbon steels.
    • 💡During inspection tasks, systematically check each weld characteristic against quality standards, and be prepared to justify your acceptance or rejection decisions.
    • 💡Memorise typical parameters for common materials.
    • 💡Understand the role of filler rods and tungsten electrodes.
    • 💡Practice identifying weld defects and their causes.
    • 💡Always show your working in calculations. Even if the final answer is wrong, you can gain marks for correct method and intermediate steps.
    • 💡Use technical terminology accurately. For example, distinguish between 'accuracy' and 'precision' when discussing measurements. This demonstrates depth of understanding.
    • 💡In practical assessments, plan your work before starting. A clear, logical approach with safety considerations will impress examiners and reduce errors.

    Common Mistakes

    Common errors to avoid in your coursework

    • Using incorrect tungsten electrode type or size.
    • Neglecting gas shielding leading to weld contamination.
    • Incorrectly setting amperage for material thickness.
    • Using incorrect tungsten electrode size or type for the material.
    • Poor gas shielding leading to weld contamination.
    • Incorrect filler rod selection causing weak welds.
    • Confusing the roles of different shielding gases, leading to inappropriate gas selection for materials like aluminium.
    • Neglecting to clean the workpiece and filler rod properly, causing contamination and weld porosity.
    • Incorrectly setting the welding current type (AC vs. DC) and balance, resulting in poor arc control or tungsten spitting.
    • Assuming all health and safety measures are the same as for MIG/MAG welding, overlooking the specific hazards of TIG like intense UV radiation and fume from base metals.
    • Confusing TIG with MIG welding.
    • Underestimating the importance of gas shielding.
    • Ignoring pre-weld cleaning requirements.
    • Misconception: Engineering is only about maths and science. Correction: While maths and science are important, engineering also requires creativity, teamwork, and communication skills to solve real-world problems.
    • Misconception: All engineering is the same. Correction: Engineering has many specialisms (mechanical, electrical, civil, etc.), each with unique principles and applications. The diploma covers multiple disciplines to give a broad foundation.
    • Misconception: Practical work is less important than theory. Correction: In this vocational qualification, practical application is equally important. Examiners look for evidence of hands-on skills and the ability to apply theory to practical tasks.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •GCSE Mathematics (Grade 4 or above) is essential for handling engineering calculations.
    • •GCSE Science (Physics or Combined Science) provides a foundation in principles like forces, energy, and materials.
    • •Basic IT skills are helpful for using CAD software and data analysis tools.

    Key Terminology

    Essential terms to know

    • Understand the principles of Tungsten Inert Gas (TIG) Welding, Understand Metallurgy associated with welding, Understand Welding Health and Safety, Understand equipment associated with Tungsten Inert Gas (TIG) Welding, Understand the consumables used in Tungsten Inert Gas (TIG) Welding, Understand Welding procedures and methods of testing applied to Tungsten Inert Gas (TIG)
    • Understand the principles of Tungsten Inert Gas (TIG) Welding, Understand Metallurgy associated with welding, Understand Welding Health and Safety, Understand equipment associated with Tungsten Inert Gas (TIG) Welding, Understand the consumables used in Tungsten Inert Gas (TIG) Welding, Understand Welding procedures and methods of testing applied to Tungsten Inert Gas (TIG)
    • TIG welding principles
    • Metallurgy of welding
    • Health and safety practices
    • Welding equipment and setup
    • Consumable selection
    • Weld procedures and inspection
    • Understand the principles of Tungsten Inert Gas (TIG) Welding, Understand Metallurgy associated with welding, Understand Welding Health and Safety, Understand equipment associated with Tungsten Inert Gas (TIG) Welding, Understand the consumables used in Tungsten Inert Gas (TIG) Welding, Understand Welding procedures and methods of testing applied to Tungsten Inert Gas (TIG)

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