Metal-Arc Gas Shielded Welding - Low Carbon Steel — SEG Awards Vocationally-Related Qualification Design and Technology Revision

    Metal-Arc Gas Shielded (MAGS) welding of low carbon steel is a key skill. This unit covers PPE, risks, equipment, welding parameters, joint production, vis

    Topic Synopsis

    Metal-Arc Gas Shielded (MAGS) welding of low carbon steel is a key skill. This unit covers PPE, risks, equipment, welding parameters, joint production, visual inspection, and destructive testing.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Metal-Arc Gas Shielded Welding - Low Carbon Steel

    SEG AWARDS
    vocational

    Metal-Arc Gas Shielded (MAGS) welding of low carbon steel is a key skill. This unit covers PPE, risks, equipment, welding parameters, joint production, visual inspection, and destructive testing.

    1
    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    5
    Assessment Criteria

    Assessment criteria

    SEG Awards Level 2 Certificate in Welding Techniques and Skills

    Topic Overview

    The SEG Awards Level 2 Certificate in Welding Techniques and Skills is a vocationally-related qualification that introduces students to the core principles and practices of welding within the context of Design and Technology. This qualification covers essential welding processes, including Manual Metal Arc (MMA), Metal Inert Gas (MIG), and Tungsten Inert Gas (TIG) welding, along with health and safety regulations, material preparation, and joint design. Students develop practical skills in setting up equipment, selecting appropriate welding parameters, and producing sound welds on various joint configurations, such as butt, lap, and T-joints. The course also emphasises the importance of quality control and inspection, including visual assessment and destructive testing methods.

    This qualification is vital for students pursuing careers in engineering, manufacturing, construction, and automotive industries, as welding is a fundamental skill in these sectors. It provides a solid foundation for further study at Level 3 or apprenticeships in welding and fabrication. By mastering welding techniques, students gain hands-on experience that bridges theoretical knowledge with real-world application, enhancing their problem-solving abilities and attention to detail. The certificate also instils a strong safety culture, which is critical in any workshop environment.

    Within the wider Design and Technology curriculum, welding techniques complement topics such as material properties, structural integrity, and manufacturing processes. Understanding how metals behave under heat and stress allows students to design more robust and functional products. This qualification encourages a systematic approach to project work, from initial design through to final fabrication, and fosters an appreciation for the precision and craftsmanship required in professional welding.

    Key Concepts

    Core ideas you must understand for this topic

    • →Welding processes: Understand the differences between MMA, MIG, and TIG welding, including their advantages, limitations, and typical applications. For example, MIG is ideal for thin materials and high productivity, while TIG offers greater control for precision work.
    • →Joint types and weld positions: Recognise common joint configurations (butt, lap, T-joint, corner) and welding positions (flat, horizontal, vertical, overhead). Each requires specific techniques to ensure penetration and avoid defects.
    • →Welding parameters: Know how to set current, voltage, wire feed speed, and travel speed based on material thickness and type. Incorrect parameters can lead to weak welds, spatter, or burn-through.
    • →Health and safety: Always follow COSHH regulations, use appropriate PPE (welding helmet, gloves, apron), ensure adequate ventilation, and be aware of fire risks. Never weld without proper training on equipment.
    • →Weld inspection and defects: Identify common defects like porosity, slag inclusion, undercut, and lack of fusion. Understand how to prevent them through correct technique and parameter adjustment.

    Learning Objectives

    What you need to know and understand

    • 1.1 Identify the need to use appropriate PPE (personal protective equipment) when carrying out MAGS welding activities1.2 Identify the risks associated when welding with MAGS, to include:• arc radiation burns• arc eye• burns from handling hot materials• welding fumes• electric shocks • fire• sparks1.3 Identify fire prevention and emergency procedures required in the workplace, to include:• causes of fire• types of fire extinguisher used• evacuation procedures1.4 Identify the main groups of safety signs, to include:• warning• prohibition• mandatory• information signs1.5 Identify the function of the listed equipment when used with MAGS welding activities:• power source unit• welding lead• welding return lead• welding earth• welding torch• wire feed unit• shielding gas supply, regulator and flow meter1.6 Identify ancillary equipment used when welding with the MAGS welding process1.7 Identify suitable storage conditions for MAGS welding wires1.8 Identify the electrode wires in terms of:• size by electrode diameter• weight of spool• copper coated type1.9 Identify appropriate safety checks on MAGS welding equipment prior to use1.10 Prepare to carry out the MAGS welding process to produce welded joints in the PA or PB positions, to include:• production of the correct welding preparation• identify distortion control methods to be used• select the correct wire size• select correct gas flow rates• set the correct welding current• produce suitable tack welds• weld the joint• post welding cleaning1.11 Identify welding parameters to be used when completing welded joints using MAGS welding, to include:• welding current• gas type and flow rates• welding torch slope and tilt angle1.12 Identify suitable safety checks on welding equipment prior to use1.13 Complete a weld on:• low carbon steel greater than 6 mm in thickness or• stainless steel in materials greater than 3mm in thickness or • aluminium in materials greater than 3mm in thicknessusing the MAGS welding process, to include as a minimum:• lap joint • open outside corner • single vee butt joint• tee fillet weldWelds to be completed in the PA or PB position1.14 Describe the limitations of visual inspections on completed welded joints when using the MAGS welding process1.15 Identify and describe typical welding defects that may be found in MAGS welded joints, to include:• undercut • cracks• inclusions• porosity• arc craters• lack of fusion• lack of penetration 1.16 Check completed welds for:• weld size to cover leg length and throat thickness.• weld profile• weld appearance and uniformity• absence of surface defects1.17 Complete the requirements for a report document on welds produced1.18 Prepare and carry out a destructive test on a fillet weld in accordance with the supplied drawing of the welded joint, to include:• nick break test1.19 Prepare and carry out destructive tests on a completed single vee butt weld in accordance with the supplied drawing of the welded joints, to include:• face bend test• root bend test• fracture test1.20 Identify appropriate documentation relating to welding activities, to include:• welding procedure specifications (WPS)• weld inspection report

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Identify appropriate PPE and safety precautions for MAGS welding.
    • Prepare MAGS equipment and materials correctly.
    • Produce welded joints in PA or PB positions.
    • Visually inspect welds and identify defects.
    • Carry out destructive tests on welds.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Memorise typical welding parameters for different materials.
    • 💡Practice setting up the wire feed and gas supply.
    • 💡Learn to interpret weld inspection reports.
    • 💡Pay close attention to weld preparation: Clean the metal thoroughly, remove rust, oil, and paint, and ensure proper fit-up. Examiners look for evidence of good preparation as it directly affects weld quality.
    • 💡Practice maintaining a consistent travel speed and arc length. Inconsistent technique leads to uneven bead profiles and potential defects. Use a steady hand and practice on scrap pieces before the assessed weld.
    • 💡Understand the marking criteria: Marks are awarded for safety, setup, technique, and final weld quality. Even if the weld is not perfect, demonstrating correct procedure and safety awareness can earn partial credit.

    Common Mistakes

    Common errors to avoid in your coursework

    • Incorrect gas flow rate settings.
    • Poor torch angle leading to defects.
    • Failure to clean weld area before inspection.
    • Misconception: 'MIG welding doesn't require as much skill as TIG, so it's easier to get a good weld.' Correction: While MIG is more forgiving, achieving consistent, high-quality welds still requires proper technique, including maintaining correct gun angle, travel speed, and stick-out distance. Poor MIG welds can have hidden defects like lack of fusion.
    • Misconception: 'Thicker materials always need higher current settings.' Correction: Current must be matched to material thickness, but also to joint design and welding position. For example, vertical welding often requires lower current to prevent weld metal from sagging.
    • Misconception: 'If the weld looks good on the surface, it's strong underneath.' Correction: Visual inspection alone is insufficient; internal defects like porosity or incomplete penetration can compromise strength. Destructive testing (e.g., bend tests) is essential for certification.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of material properties (e.g., melting points, thermal conductivity) from Key Stage 3 or 4 Design and Technology.
    • •Familiarity with workshop safety practices and use of hand tools, such as grinders and clamps.
    • •Some experience with measuring and marking out, including using rulers, squares, and scribers.

    Key Terminology

    Essential terms to know

    • 1.1 Identify the need to use appropriate PPE (personal protective equipment) when carrying out MAGS welding activities1.2 Identify the risks associated when welding with MAGS, to include:• arc radiation burns• arc eye• burns from handling hot materials• welding fumes• electric shocks • fire• sparks1.3 Identify fire prevention and emergency procedures required in the workplace, to include:• causes of fire• types of fire extinguisher used• evacuation procedures1.4 Identify the main groups of safety signs, to include:• warning• prohibition• mandatory• information signs1.5 Identify the function of the listed equipment when used with MAGS welding activities:• power source unit• welding lead• welding return lead• welding earth• welding torch• wire feed unit• shielding gas supply, regulator and flow meter1.6 Identify ancillary equipment used when welding with the MAGS welding process1.7 Identify suitable storage conditions for MAGS welding wires1.8 Identify the electrode wires in terms of:• size by electrode diameter• weight of spool• copper coated type1.9 Identify appropriate safety checks on MAGS welding equipment prior to use1.10 Prepare to carry out the MAGS welding process to produce welded joints in the PA or PB positions, to include:• production of the correct welding preparation• identify distortion control methods to be used• select the correct wire size• select correct gas flow rates• set the correct welding current• produce suitable tack welds• weld the joint• post welding cleaning1.11 Identify welding parameters to be used when completing welded joints using MAGS welding, to include:• welding current• gas type and flow rates• welding torch slope and tilt angle1.12 Identify suitable safety checks on welding equipment prior to use1.13 Complete a weld on:• low carbon steel greater than 6 mm in thickness or• stainless steel in materials greater than 3mm in thickness or • aluminium in materials greater than 3mm in thicknessusing the MAGS welding process, to include as a minimum:• lap joint • open outside corner • single vee butt joint• tee fillet weldWelds to be completed in the PA or PB position1.14 Describe the limitations of visual inspections on completed welded joints when using the MAGS welding process1.15 Identify and describe typical welding defects that may be found in MAGS welded joints, to include:• undercut • cracks• inclusions• porosity• arc craters• lack of fusion• lack of penetration 1.16 Check completed welds for:• weld size to cover leg length and throat thickness.• weld profile• weld appearance and uniformity• absence of surface defects1.17 Complete the requirements for a report document on welds produced1.18 Prepare and carry out a destructive test on a fillet weld in accordance with the supplied drawing of the welded joint, to include:• nick break test1.19 Prepare and carry out destructive tests on a completed single vee butt weld in accordance with the supplied drawing of the welded joints, to include:• face bend test• root bend test• fracture test1.20 Identify appropriate documentation relating to welding activities, to include:• welding procedure specifications (WPS)• weld inspection report

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