Manual Metal-Arc Welding - (Vertical) - Low Carbon Steel — SEG Awards Vocationally-Related Qualification Design and Technology Revision

    This element focuses on the practical and theoretical aspects of Manual Metal-Arc (MMA) welding in the vertical position (PF/PG) on low carbon steel, empha

    Topic Synopsis

    This element focuses on the practical and theoretical aspects of Manual Metal-Arc (MMA) welding in the vertical position (PF/PG) on low carbon steel, emphasizing compliance with health and safety legislation, correct equipment setup and maintenance, electrode selection, and parameter adjustment to achieve sound welds. Learners will develop skills in joint preparation, distortion control, and the interpretation of Welding Procedure Specifications (WPS), alongside the ability to visually inspect and destructively test completed welds to identify and diagnose typical defects.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Manual Metal-Arc Welding - (Vertical) - Low Carbon Steel

    SEG AWARDS
    vocational

    This element focuses on the practical and theoretical aspects of Manual Metal-Arc (MMA) welding in the vertical position (PF/PG) on low carbon steel, emphasizing compliance with health and safety legislation, correct equipment setup and maintenance, electrode selection, and parameter adjustment to achieve sound welds. Learners will develop skills in joint preparation, distortion control, and the interpretation of Welding Procedure Specifications (WPS), alongside the ability to visually inspect and destructively test completed welds to identify and diagnose typical defects.

    6
    Learning Outcomes
    5
    Assessment Guidance
    5
    Key Skills
    6
    Key Terms
    6
    Assessment Criteria

    Assessment criteria

    SEG Awards Level 3 Diploma in Welding Techniques and Skills

    Topic Overview

    The SEG Awards Level 3 Diploma in Welding Techniques and Skills is a vocationally-related qualification designed for students aiming to become proficient welders in industries such as construction, manufacturing, and engineering. This diploma covers advanced welding processes, including Manual Metal Arc (MMA), Metal Inert Gas (MIG), Tungsten Inert Gas (TIG), and Flux-Cored Arc Welding (FCAW). Students develop practical skills in preparing joints, selecting appropriate welding parameters, and inspecting welds to industry standards. The qualification also emphasises health and safety regulations, material science, and quality control, ensuring graduates are job-ready.

    This diploma is part of the wider Design and Technology curriculum, bridging theoretical knowledge with hands-on application. It prepares students for roles such as welding technician, fabricator, or site welder, and provides a pathway to higher-level apprenticeships or engineering courses. Mastery of welding techniques is critical for producing safe, durable structures and components, making this qualification highly valued by employers. By the end of the course, students will be able to interpret engineering drawings, set up welding equipment, and produce welds that meet British and European standards (e.g., BS EN ISO 9606).

    The Level 3 Diploma builds on foundational skills from Level 2, introducing more complex joint configurations, positional welding (e.g., vertical, overhead), and advanced defect prevention. Students also learn about destructive and non-destructive testing methods, such as bend tests and ultrasonic inspection. This comprehensive approach ensures that graduates can work independently and troubleshoot common welding issues, making them assets in any fabrication environment.

    Key Concepts

    Core ideas you must understand for this topic

    • →Welding Processes: Understand the principles, advantages, and limitations of MMA, MIG, TIG, and FCAW. Know when to use each process based on material type, thickness, and position.
    • →Joint Preparation and Fit-Up: Master the techniques for beveling, cleaning, and aligning edges to ensure proper penetration and fusion. Incorrect preparation leads to defects like lack of fusion or slag inclusion.
    • →Welding Parameters: Set correct current, voltage, travel speed, and wire feed speed. These parameters directly affect bead shape, penetration depth, and heat input, which influence mechanical properties.
    • →Defect Identification and Prevention: Recognise common defects such as porosity, undercut, and cracking. Understand causes (e.g., moisture, incorrect technique) and corrective actions.
    • →Health and Safety: Comply with COSHH regulations, use PPE (e.g., welding helmet, gloves, fire-resistant clothing), and ensure adequate ventilation. Welding fumes and UV radiation are significant hazards.

    Learning Objectives

    What you need to know and understand

    • Apply current health and safety legislation and risk assessment procedures to MMA welding operations in vertical positions.
    • Select and functionally check appropriate MMA welding equipment, including low voltage safety devices, for welding low carbon steel.
    • Justify electrode choice and welding parameters (current, polarity, arc length, travel speed, electrode angles) for vertical-up and vertical-down welding.
    • Prepare weld joints and apply distortion control measures in accordance with a Welding Procedure Specification (WPS).
    • Perform visual inspection and destructive tests (nick break, bend, fracture) on completed welds to evaluate quality against acceptance criteria.
    • Diagnose typical welding defects in MMA joints, linking causes to procedural or operator errors.

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Correctly identifies employer and employee duties under HASAWA 1974 and references specific regulations (COSHH, PUWER, RIDDOR) in context.
    • Demonstrates pre-use safety checks on all MMA equipment, including LVSD operation and earth connections.
    • Selects correct electrode type and diameter, and sets welding current, polarity, and OCV appropriate for low carbon steel in PF/PG positions.
    • Produces tee fillet, butt, outside corner, and lap joints in vertical position with minimal discontinuities, following a WPS.
    • Conducts visual inspection and records results systematically (e.g., using gauges, reports), identifying any defects accurately.
    • Prepares and performs destructive tests (nick break, face/root bend, fracture) safely, and interprets results to assess root fusion and soundness.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Always reference specific legislation and regulation numbers when discussing health and safety responsibilities.
    • 💡Demonstrate a systematic, step-by-step approach to pre-welding equipment checks; verbalise while performing.
    • 💡When describing vertical welding parameters, state typical ranges (e.g., current lower than for flat position) and explain the effect of gravity on the weld pool.
    • 💡Use precise technical terminology (e.g., ‘interpass temperature’, ‘root face’, ‘weaving technique’) in both written and practical assessments.
    • 💡For visual inspection, use a logical sequence (e.g., undercut, overlap, surface porosity) and qualify severity against given limits.
    • 💡Always refer to relevant standards (e.g., BS EN ISO 9606) when describing weld testing or acceptance criteria. Examiners award marks for demonstrating knowledge of industry specifications.
    • 💡In practical assessments, focus on consistency: maintain a steady travel speed and arc length. Uneven beads or excessive spatter indicate poor control, which loses marks.
    • 💡When answering theory questions, use correct terminology (e.g., 'heat-affected zone' not 'hot area'). Define terms and explain their significance to show depth of understanding.

    Common Mistakes

    Common errors to avoid in your coursework

    • Confusing open circuit voltage (OCV) with the actual welding voltage, leading to incorrect parameter settings.
    • Incorrect electrode angle and/or travel speed in vertical welding, resulting in lack of fusion, slag inclusions, or excessive reinforcement.
    • Neglecting to pre-set or restrain workpieces to counteract distortion, causing misalignment especially in butt joints.
    • Misidentifying slag inclusions as lack of penetration on visual inspection or fracture surfaces.
    • Storing low-hydrogen electrodes outside a heated quiver, leading to hydrogen-induced cracking.
    • Mistake: Believing that higher current always produces stronger welds. Correction: Excessive current can cause burn-through, excessive spatter, and distortion. Optimal current depends on material thickness and joint design.
    • Mistake: Thinking that TIG welding is easier than MIG. Correction: TIG requires greater skill due to the need for precise hand-eye coordination and foot pedal control. It is slower but produces higher quality welds on thin materials.
    • Mistake: Assuming that all welding defects are visible to the naked eye. Correction: Many defects, such as lack of fusion or internal cracks, are subsurface and require non-destructive testing (e.g., radiography) to detect.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Level 2 Diploma in Welding Skills (or equivalent) covering basic welding processes and safety.
    • •Understanding of engineering drawings and symbols, including weld symbols (BS EN 22553).
    • •Basic knowledge of material properties, especially carbon steel and stainless steel.

    Key Terminology

    Essential terms to know

    • Health & Safety Legislation and Risk Assessment
    • MMA Welding Equipment and Maintenance
    • Electrode Classification and Storage
    • Vertical Welding Parameters and Technique
    • Joint Preparation and Distortion Control
    • Weld Inspection and Defect Analysis

    Ready to learn?

    AI-powered learning tailored to this unit

    Related Topics in SEG AWARDS vocational Design and Technology

    12. Advanced Fabrication Processes – Plate (3 mm and Above in Thickness)

    View Topic

    6. Fabrication Processes – Sheet Metal

    View Topic

    Advanced Fabrication Processes – Sheet Metal (below 3 mm in Thickness)

    View Topic

    Engineering Drawing

    View Topic