Pipe Welding Using Manual Metal-Arc Welding — SEG Awards Vocationally-Related Qualification Design and Technology Revision

    This unit covers pipe welding using manual metal-arc welding (MMA), including safety, equipment, joint preparation, and welding parameters. Learners must w

    Topic Synopsis

    This unit covers pipe welding using manual metal-arc welding (MMA), including safety, equipment, joint preparation, and welding parameters. Learners must weld pipe joints to specification and understand relevant health and safety regulations.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Pipe Welding Using Manual Metal-Arc Welding

    SEG AWARDS
    vocational

    This unit covers pipe welding using manual metal-arc welding (MMA), including safety, equipment, joint preparation, and welding parameters. Learners must weld pipe joints to specification and understand relevant health and safety regulations.

    1
    Learning Outcomes
    3
    Assessment Guidance
    3
    Key Skills
    1
    Key Terms
    5
    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 filler materials, and inspecting welds to industry standards like BS EN ISO 9606-1. The course also emphasises health and safety regulations, such as the Control of Substances Hazardous to Health (COSHH) and Personal Protective Equipment (PPE) requirements, ensuring graduates can work safely in professional environments.

    This qualification is part of the wider Design and Technology curriculum, bridging theoretical knowledge with hands-on application. It prepares students for careers as coded welders, welding inspectors, or fabrication specialists, and provides a pathway to higher-level apprenticeships or engineering courses. Mastery of welding techniques is critical for producing strong, durable structures in sectors like automotive, aerospace, and oil and gas. By the end of the diploma, students will be able to interpret engineering drawings, set up welding equipment correctly, and produce welds that meet stringent quality criteria, including non-destructive testing (NDT) methods like visual inspection and dye penetrant testing.

    Key Concepts

    Core ideas you must understand for this topic

    • →Welding Positions and Techniques: Understand the differences between flat (PA), horizontal (PB), vertical (PF), and overhead (PE) positions, and how to adjust parameters like current, voltage, and travel speed for each.
    • →Joint Preparation and Fit-Up: Master the correct angles, root gaps, and land sizes for butt, T-joint, lap, and corner joints, as specified in welding procedure specifications (WPS).
    • →Weld Defects and Prevention: Identify common defects such as porosity, slag inclusion, undercut, and lack of fusion, and know how to adjust technique or settings to avoid them.
    • →Material Selection and Preheat: Know the properties of carbon steel, stainless steel, and aluminium, and when preheat or interpass temperature control is required to prevent cracking.
    • →Safety and COSHH Regulations: Always use appropriate PPE (welding helmet, gloves, flame-resistant clothing) and ensure adequate ventilation to avoid fume inhalation, following the hierarchy of controls.

    Learning Objectives

    What you need to know and understand

    • 1.1. Identify the roles of various organisations involved with health and safety in the workplace, to include:• Health and Safety Executive (HSE)• Environmental Health• Local Authorities1.2. Identify the roles of various individuals involved with health and safety in the workplace, to include:• Company safety officers• Company safety representatives• Environmental health officers• HSE inspectors1.3. Identify the purpose and typical contents of an Organisations health and safety policy1.4. Describe the purpose of a risk assessment, to include:• who should carry out risk assessments• when to carry out a risk assessment• identification of the 5 steps of risk assessment1.5. Identify the precautions to be taken when working in high risk areas, to include:• risk assessments• permits to work• high/low temperature working conditions• lock off systems• isolation of equipment1.6. Describe the control and safe removal of welding fumes and gases created during the welding process, to include:• natural extraction• local extraction• PPE and specialist breathing equipment1.7. Identify the risk associated with pipe welding on site, to include:• location• environmental (wind, rain etc.)• availability of power supply• working/welding in trenches• welding at heights1.8. Identify the different power sources used when welding with MMA, MAGS and TAG welding, to include:• transformer• generator• rectifier• invertor1.9. Describe features of the power sources as listed in 2.1, to include:• type of current produced (AC/DC) • maintenance requirements• portability• suitable applications 1.10. Identify specialist equipment used when carrying out pipe welding activities, to include:• pipe cutting equipment• jigs/fixtures• turntables/rotators/manipulators1.11. Describe the importance of correct storage conditions for electrodes, wires and gas cylinders, to include:• location• ventilation• contamination• labelling 1.12. Identify the use of different types of electrodes, electrode wires and filler wires when carrying out pipe welding activities1.13. Identify the range and application of shielding gases and gas mixtures used when pipe welding with the MAGS or TAG welding process1.14. Describe the effects of using damaged or corroded electrodes, electrode wires and filler wires when carrying out pipe welding activities1.15. Identify and select the required welding parameters to be used when welding low carbon steel pipes using MMA, MAGS and TAG welding processes, to include:• welding voltage• welding current• electrode polarity• wire feed speed• torch slope and tilt angles• electrode extension• speed of travel• inductance• gas delay system• shielding gas type• shielding gas flow rate (LPM)1.16. Identify suitable welding preparations for the type of joint, diameter and wall thickness of the pipe being welded, to include:• included angle• angle of bevel• root face dimension• root gap dimension1.17. Identify different types of joints used in pipe work assemblies, to include:• butt welds• branch joints• slip on flange• set on flange1.18. Describe the advantages and limitations of the methods listed that are used to produce suitable welding preparations on materials, to include:• thermal methods• mechanical (chip forming)• bevelling machines• abrasive methods1.19. Identify the application of both permanent and temporary backing rings used in pipe welding1.20. Identify methods used to ensure pipe alignment before and during welding activities1.21. Identify different types of pipe work fittings, to include:• concentric reducers• eccentric reducers• equal diameter tee pieces• unequal diameter tee pieces• elbows 45° 60° 90°• blank ends (dished ends)1.22. Identify appropriate safety checks on the selected welding equipment prior to use1.23. Select suitable welding parameters to enable the listed joints (given in 6.3.) to be welded by one process from the following:• MMA welding• MAGS welding• TAG welding1.24. Weld No 1 – single vee pipe butt weld – rotated. Weld No 2 – s

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Identify health and safety roles and risk assessment steps.
    • Select correct welding parameters for pipe material and thickness.
    • Prepare pipe ends with correct bevel and root gap.
    • Weld pipe joints (butt, branch, flange) to code requirements.
    • Inspect welds for defects and ensure quality.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡Memorise typical welding parameters for common pipe sizes.
    • 💡Practice setting up and adjusting welding current.
    • 💡Know the steps of risk assessment and permit-to-work.
    • 💡Tip 1: In practical assessments, always set up your workstation methodically. Examiners award marks for preparation: clean the base metal, check gas flow, and ensure correct polarity before striking an arc. Rushing leads to mistakes.
    • 💡Tip 2: When answering theory questions, use technical vocabulary precisely. For example, distinguish between 'penetration' (depth of fusion into base metal) and 'reinforcement' (excess weld metal above the surface). Refer to BS EN ISO standards where relevant.
    • 💡Tip 3: For written exams, practice interpreting welding symbols from engineering drawings. Know how to identify weld type, size, length, and contour. A common mistake is confusing 'fillet weld' with 'butt weld' symbols.

    Common Mistakes

    Common errors to avoid in your coursework

    • Incorrect electrode storage leading to moisture absorption.
    • Poor joint preparation causing lack of fusion.
    • Incorrect welding parameters causing defects like porosity.
    • Misconception: 'MIG welding is easier than TIG, so I don't need to practice as much.' Correction: While MIG is more forgiving, both require precise control of travel speed, gun angle, and wire feed speed to produce sound welds. TIG demands greater hand-eye coordination but offers superior control for thin materials.
    • Misconception: 'If the weld looks good on the surface, it's strong underneath.' Correction: Surface appearance can be deceptive. Internal defects like lack of fusion or porosity may only be detected through destructive testing or NDT. Always follow WPS and inspect thoroughly.
    • Misconception: 'I can skip preheat for thick steel if it's not too cold.' Correction: Preheat is essential for thick sections (typically >25mm) to reduce cooling rate and prevent hydrogen-induced cracking. Even in mild conditions, preheat to the specified temperature (e.g., 100°C for S355 steel) is mandatory.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Basic understanding of engineering materials (e.g., carbon steel vs. stainless steel) and their properties.
    • •Familiarity with workshop safety procedures, including fire prevention and first aid for burns.
    • •Completion of a Level 2 welding course or equivalent experience in manual handling and measuring tools.

    Key Terminology

    Essential terms to know

    • 1.1. Identify the roles of various organisations involved with health and safety in the workplace, to include:• Health and Safety Executive (HSE)• Environmental Health• Local Authorities1.2. Identify the roles of various individuals involved with health and safety in the workplace, to include:• Company safety officers• Company safety representatives• Environmental health officers• HSE inspectors1.3. Identify the purpose and typical contents of an Organisations health and safety policy1.4. Describe the purpose of a risk assessment, to include:• who should carry out risk assessments• when to carry out a risk assessment• identification of the 5 steps of risk assessment1.5. Identify the precautions to be taken when working in high risk areas, to include:• risk assessments• permits to work• high/low temperature working conditions• lock off systems• isolation of equipment1.6. Describe the control and safe removal of welding fumes and gases created during the welding process, to include:• natural extraction• local extraction• PPE and specialist breathing equipment1.7. Identify the risk associated with pipe welding on site, to include:• location• environmental (wind, rain etc.)• availability of power supply• working/welding in trenches• welding at heights1.8. Identify the different power sources used when welding with MMA, MAGS and TAG welding, to include:• transformer• generator• rectifier• invertor1.9. Describe features of the power sources as listed in 2.1, to include:• type of current produced (AC/DC) • maintenance requirements• portability• suitable applications 1.10. Identify specialist equipment used when carrying out pipe welding activities, to include:• pipe cutting equipment• jigs/fixtures• turntables/rotators/manipulators1.11. Describe the importance of correct storage conditions for electrodes, wires and gas cylinders, to include:• location• ventilation• contamination• labelling 1.12. Identify the use of different types of electrodes, electrode wires and filler wires when carrying out pipe welding activities1.13. Identify the range and application of shielding gases and gas mixtures used when pipe welding with the MAGS or TAG welding process1.14. Describe the effects of using damaged or corroded electrodes, electrode wires and filler wires when carrying out pipe welding activities1.15. Identify and select the required welding parameters to be used when welding low carbon steel pipes using MMA, MAGS and TAG welding processes, to include:• welding voltage• welding current• electrode polarity• wire feed speed• torch slope and tilt angles• electrode extension• speed of travel• inductance• gas delay system• shielding gas type• shielding gas flow rate (LPM)1.16. Identify suitable welding preparations for the type of joint, diameter and wall thickness of the pipe being welded, to include:• included angle• angle of bevel• root face dimension• root gap dimension1.17. Identify different types of joints used in pipe work assemblies, to include:• butt welds• branch joints• slip on flange• set on flange1.18. Describe the advantages and limitations of the methods listed that are used to produce suitable welding preparations on materials, to include:• thermal methods• mechanical (chip forming)• bevelling machines• abrasive methods1.19. Identify the application of both permanent and temporary backing rings used in pipe welding1.20. Identify methods used to ensure pipe alignment before and during welding activities1.21. Identify different types of pipe work fittings, to include:• concentric reducers• eccentric reducers• equal diameter tee pieces• unequal diameter tee pieces• elbows 45° 60° 90°• blank ends (dished ends)1.22. Identify appropriate safety checks on the selected welding equipment prior to use1.23. Select suitable welding parameters to enable the listed joints (given in 6.3.) to be welded by one process from the following:• MMA welding• MAGS welding• TAG welding1.24. Weld No 1 – single vee pipe butt weld – rotated. Weld No 2 – s

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