Preparing and using semi-automatic MIG, MAG and flux cored arc welding equipment
This subtopic covers the essential skills for setting up and operating semi-automatic welding equipment, including MIG, MAG, and flux-cored arc welding, which are commonly used in blacksmithing for joining ferrous and non-ferrous metals. Learners will gain proficiency in selecting appropriate wire types, adjusting machine parameters, and ensuring weld quality through proper technique and safety practices. Mastery of these processes enables efficient fabrication and repair work in artistic and structural metalwork.
Assessment criteria
Topic Overview
The City & Guilds Level 3 Diploma in Blacksmithing is an advanced vocational qualification designed for students who have mastered basic forging techniques and wish to develop professional-level skills in creative and architectural blacksmithing. This diploma covers complex processes such as forge welding, tool making, and the fabrication of large-scale structural components. Students explore the properties of ferrous and non-ferrous metals, heat treatment methods, and the design principles behind functional and decorative metalwork. The qualification emphasizes both traditional craftsmanship and modern workshop practices, including health and safety regulations, project planning, and quality control.
This diploma is part of the Manufacturing & Engineering suite, specifically tailored for those pursuing careers as professional blacksmiths, farriers, or metal artisans. It bridges the gap between technical skill and artistic expression, preparing students for roles in heritage restoration, custom fabrication, or self-employment. By the end of the course, learners are expected to produce a portfolio of complex pieces, demonstrating competence in drawing, marking out, cutting, forming, joining, and finishing metals. The qualification also develops problem-solving abilities and an understanding of business operations, making it a comprehensive foundation for entering the blacksmithing trade.
Key Concepts
Core ideas you must understand for this topic
- →Forge welding: The process of joining two pieces of metal by heating them to a high temperature (typically 1300°C) and hammering them together. Requires precise control of temperature, flux application (e.g., borax), and hammer technique to create a strong, homogeneous joint.
- →Heat treatment: Controlled heating and cooling of metals to alter their mechanical properties. Includes annealing (softening), normalising (relieving stresses), hardening (increasing strength), and tempering (reducing brittleness). Understanding critical temperatures and cooling rates (e.g., quenching in oil or water) is essential.
- →Tool making: Designing and forging custom tools such as chisels, punches, tongs, and hammers. Students must select appropriate steel grades (e.g., high-carbon steel for edge tools) and apply heat treatment to achieve desired hardness and durability.
- →Architectural blacksmithing: Creating functional and decorative elements for buildings, such as gates, railings, balconies, and light fixtures. Involves interpreting design drawings, scaling patterns, and fabricating components that meet structural and aesthetic specifications.
- →Project planning and risk assessment: Developing a systematic approach to a blacksmithing project, including material selection, cost estimation, timeline management, and identification of hazards (e.g., burns, fumes, heavy lifting). Compliance with UK health and safety legislation (e.g., COSHH, PUWER) is mandatory.
Learning Objectives
What you need to know and understand
- Prepare and use manual MIG, MAG and other continuous wire welding equipment, Know how to prepare and use manual MIG, MAG and other continuous wire welding equipment
Assessment Criteria
Key criteria assessors look for in your portfolio
- Award credit for demonstrating correct pre-use checks, including gas flow, wire feed, and electrical connections.
- Expect evidence of appropriate personal protective equipment (PPE) selection and use, such as auto-darkening helmet, gloves, and flame-resistant clothing.
- Look for accurate setting of voltage, amperage, and wire feed speed according to material thickness and type.
- Assess the quality of weld beads: consistent ripple pattern, appropriate penetration, and minimal spatter.
- Evidence of post-weld inspection and cleaning, including slag removal for flux-cored welding.
Assessment Guidance
Guidance for achieving higher grades
- 💡In practical assessments, always demonstrate a methodical setup routine, narrating your actions if permitted to show understanding.
- 💡When completing written assignments, use technical terminology correctly: refer to 'duty cycle', 'penetration', and 'deposition rate' where appropriate.
- 💡For any portfolio evidence, include photographs of both good and poor welds with annotated explanations of what went wrong and how to correct it.
- 💡Familiarise yourself with the specific welding positions (e.g., flat, horizontal, vertical) and their code designations as they may be referenced in theory questions.
- 💡When demonstrating forge welding, clearly show your preparation steps: cleaning the metal, applying flux, and achieving a uniform welding heat. Examiners award marks for methodical work and safety awareness, not just the final result. A failed weld with proper technique can still earn partial credit.
- 💡In your portfolio, include detailed annotations explaining your design choices, material selection, and problem-solving during fabrication. Use technical terminology accurately (e.g., 'upsetting,' 'fullering,' 'swaging') to demonstrate depth of knowledge. Photographs of each stage are essential.
- 💡For the written exam, practice sketching and dimensioning your work. Questions often ask you to produce a working drawing for a given object. Use standard symbols for welds, bends, and finishes. Label materials and heat treatment specifications clearly.
Common Mistakes
Common errors to avoid in your coursework
- Incorrect wire feed speed leading to burn-back or poor arc stability.
- Neglecting to clean base metal, resulting in porosity or lack of fusion.
- Using incorrect shielding gas mixture for the material, such as pure CO2 for aluminium MIG.
- Inconsistent travel speed causing uneven bead profiles and potential defects.
- Failure to adjust machine polarity for flux-cored wires, leading to poor weld quality.
- Misconception: Forge welding is the same as brazing or soldering. Correction: Forge welding involves solid-state bonding of base metals without a filler material, requiring the metal to reach a plastic state. Brazing uses a filler metal with a lower melting point, while soldering uses even lower temperatures. The techniques, equipment, and applications differ significantly.
- Misconception: All steel can be hardened by quenching. Correction: Only high-carbon and alloy steels respond to hardening heat treatment. Mild steel (low carbon) cannot be hardened significantly because it lacks sufficient carbon to form martensite. Students must identify steel types using spark tests or other methods before attempting heat treatment.
- Misconception: Blacksmithing is purely manual and does not require modern technology. Correction: Contemporary blacksmithing integrates power hammers, hydraulic presses, plasma cutters, and CNC machines for efficiency and precision. Understanding these tools and their safe operation is part of the diploma, alongside traditional hand forging.
Frequently Asked Questions
Common questions students ask about this topic
Pass / Merit / Distinction Evidence Checklist
How your portfolio evidence is graded for CITY AND GUILDS OF LONDON INSTITUTE Preparing and using semi-automatic MIG, MAG and flux cored arc welding equipment
Every vocational unit is marked against named criteria rather than an exam percentage. Your tutor's brief lists the exact codes for this unit — here is what each band is asking you to do.
Demonstrate baseline knowledge, accurate terminology, and core practical application.
Provide detailed analysis, structured explanations, and clear workplace reasoning.
Deliver thorough evaluation, original problem solving, and fully justified recommendations.
Before You Start
Prior knowledge that will help with this topic
- •City & Guilds Level 2 Diploma in Blacksmithing or equivalent experience in basic forging techniques (e.g., drawing down, bending, twisting, punching).
- •Understanding of ferrous and non-ferrous metal properties, including common grades of steel (e.g., EN3, EN8, EN9) and their typical applications.
- •Basic workshop safety practices, including use of personal protective equipment (PPE), fire prevention, and first aid for burns.
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Key Terminology
Essential terms to know
- Prepare and use manual MIG, MAG and other continuous wire welding equipment, Know how to prepare and use manual MIG, MAG and other continuous wire welding equipment
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