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

    Metal-Arc Gas Shielded Welding (MAGS) for aluminium requires proper PPE, equipment setup, and technique. It includes safety, joint preparation, and defect

    Topic Synopsis

    Metal-Arc Gas Shielded Welding (MAGS) for aluminium requires proper PPE, equipment setup, and technique. It includes safety, joint preparation, and defect identification.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Metal-Arc Gas Shielded Welding - Aluminium

    SEG AWARDS
    vocational

    Metal-Arc Gas Shielded Welding (MAGS) for aluminium requires proper PPE, equipment setup, and technique. It includes safety, joint preparation, and defect identification.

    1
    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    4
    Assessment Criteria

    Assessment criteria

    SEG Awards Level 2 Award in Welding Techniques and Skills

    Topic Overview

    The SEG Awards Level 2 Award in Welding Techniques and Skills introduces students to the fundamental principles and practices of welding, focusing on manual metal arc (MMA) and metal inert gas (MIG) welding processes. This qualification is designed for those pursuing a career in engineering, manufacturing, or construction, providing hands-on skills in preparing, setting up, and executing welded joints on mild steel. Students learn to interpret welding symbols, select appropriate equipment and consumables, and apply safe working practices in a workshop environment.

    Mastering welding techniques is essential for producing strong, durable structures and components across industries such as automotive, shipbuilding, and infrastructure. This award covers key aspects like joint configurations (butt, lap, T-fillet), welding positions (flat, horizontal, vertical), and defect identification. By the end of the course, students can produce fillet and butt welds to a specified quality standard, understanding how heat input, travel speed, and electrode angle affect weld integrity.

    This qualification sits within the wider Design and Technology curriculum by linking theoretical knowledge of material properties and joining methods to practical application. It prepares students for further study at Level 3 or apprenticeships, emphasizing precision, problem-solving, and adherence to British Standards (e.g., BS EN ISO 9606-1). Safety is paramount, with rigorous training in using personal protective equipment (PPE) and managing risks like fumes, arc eye, and fire.

    Key Concepts

    Core ideas you must understand for this topic

    • →Welding processes: Understand the differences between MMA (stick welding) and MIG (wire feed) – MMA uses a consumable electrode coated in flux, while MIG uses a continuous wire and shielding gas (e.g., argon/CO2 mix).
    • →Joint types and positions: Know how to prepare and weld butt joints, lap joints, and T-fillets in flat (PA), horizontal-vertical (PB), and vertical (PF) positions, adjusting technique for each.
    • →Welding parameters: Control current (amperage), voltage, wire feed speed, and travel speed to achieve proper penetration, bead profile, and minimal spatter.
    • →Defect identification: Recognize common defects like porosity (gas pockets), slag inclusion, undercut, and lack of fusion, and understand their causes (e.g., incorrect angle, dirty surface).
    • →Safety procedures: Always wear appropriate PPE (welding helmet with correct shade, gloves, apron), ensure adequate ventilation, and follow fire prevention protocols.

    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 PPE and safety risks associated with MAGS welding.
    • Set up equipment correctly including gas flow and current.
    • Produce welded joints in specified positions with minimal defects.
    • Conduct visual and destructive tests on welds.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Memorise typical welding defects and causes.
    • 💡Practice setting parameters for aluminium.
    • 💡Understand destructive test procedures.
    • 💡Tip 1: Always check your equipment before starting – ensure the earth clamp is secure, gas flow is correct (for MIG), and electrode is dry (for MMA). Examiners look for methodical preparation.
    • 💡Tip 2: Focus on consistent travel speed and angle. For a fillet weld, hold the torch at 45° to the plates; for butt welds, tilt slightly (10-15°) in the direction of travel. Practice to maintain a uniform bead width.
    • 💡Tip 3: After welding, inspect your work visually and with a weld gauge. Check for undercut (a groove along the weld toe) and reinforcement height. A neat, uniform weld with no defects scores highly.

    Common Mistakes

    Common errors to avoid in your coursework

    • Incorrect gas flow rate causing porosity.
    • Poor torch angle leading to lack of fusion.
    • Neglecting pre-weld cleaning of aluminium.
    • Misconception: 'A longer arc length gives better penetration.' Correction: A long arc reduces penetration and increases spatter; maintain a short arc (about 3mm) for stable, deep fusion.
    • Misconception: 'MIG welding doesn't require cleaning the base metal.' Correction: Even with shielding gas, dirt, rust, or oil can cause porosity; always clean the joint area with a wire brush or grinder before welding.
    • Misconception: 'Welding in the vertical position is the same as flat, just tilted.' Correction: Vertical welding requires different techniques (e.g., weaving or using a lower current) to prevent molten metal from dripping; practice stringer beads or triangular weave.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of health and safety in a workshop environment, including fire extinguisher types and emergency procedures.
    • •Familiarity with hand tools (e.g., angle grinder, wire brush) and measuring instruments (e.g., ruler, vernier caliper) used for preparing metal.
    • •Knowledge of material properties of mild steel, such as melting point and thermal conductivity, is helpful but not essential.

    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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