Carry out tungsten inert gas (TIG) welding operations

Business Sectors (Suites): Coachbuilding
Developed by: IMI
Approved on: 30 Mar 2023


This unit is about joining materials safely, correctly and effectively using TIG welding techniques and procedures.

Performance criteria

You must be able to:

P1 use the appropriate personal protective equipment (PPE) *when carrying out TIG welding operations 
P2 protect the vehicle and its contents effectively when carrying out TIG welding operations 
P3 prepare material surfaces and align to enable suitable join to be achieved, ensuring mating flanges are treated following manufacturers' procedures before joining 
P4 select, set up and use the correct tools and equipment in order to correctly carry out TIG welding operations 
P5 ensure that the *tools, equipment and PPE you require are in a safe working condition 
P6 set up your equipment to carry out TIG welding operations checking:

P6.1 suitability of gas / filler wire and size for material to be joined 
P6.2 parameters are set correctly 
P6.3 consumables are correct 
P7 carry out TIG welding operations following: 

P7.1 recognised researched repair methods
P7.2 test procedures, including providing test coupons on equivalent material in accordance with British Standards 
P7.3 manufacturers' processes, methods and procedures 
P7.4 your workplace procedures 
P7.5 health, safety and legal requirements 
P8 avoid damaging other components, units, panels and surfaces on the vehicle and the surrounding work area 
P9 recognise when your weld is not forming correctly and what action needs to be taken 
P10 inspect and assess TIG weld quality in accordance with British Standards and manufacturers specification 
P11 check integrity of the weld and record the type of weld achieved on the appropriate paperwork 
P12 ensure test pieces are recorded and stored 
P13 dress the joint area without reducing material thickness and protect the repaired area to inhibit corrosion where applicable 
P14 clean and store PPE and equipment in appropriate manner 
P15 promptly report any additional faults you notice during the course of your work to the relevant person(s)  
P16 promptly report any delays in completing your work to the relevant person(s)  
P17 carry out TIG welding operations within the agreed timescale 
P18 complete work records accurately, in the format required and promptly pass them to the relevant person(s)

Knowledge and Understanding

You need to know and understand:

K1 the health, safety and legal requirements relating to the joining of materials using TIG welding operations 
K2 your workplace procedures for: 

K2.1 the referral of problems 
K2.2 reporting of delays to the completion of work 
K2.3 completion of work records 
K3 the work that needs to be done and the standard required 
K4 the requirements for protecting the vehicle and contents from damage before, during and after the joining of materials using TIG welding operations 
K5 the importance of selecting, using and maintaining the appropriate PPE when joining materials using TIG welding operations 
K6 how to find, interpret and use sources of information applicable to the joining of materials using TIG welding operations and the implications of not fully understanding the repair methods presented
K7 how to select, check, maintain and set up all of the tools and equipment required to correctly join materials using TIG welding operations 
K8 the different types of welding processes, techniques and joints used for the joining of materials when using TIG welding operations 
K9 the correct surface preparation methods to ensure a good TIG weld is achieved 
K10 the faults and defects that can occur when carrying out TIG welding and the common causes of these faults 
K11 the need for correct alignment of materials and the methods used to achieve this 
K12 the types of quality control checks that can be used to ensure correct joining of materials
K13 how to inspect and assess TIG welding in accordance with British Standards 
K14 when TIG welding should be used to join materials 
K15 the advantages of TIG welding techniques over other welding methods 
K16 the different types of joint that can be used to join materials using TIG welding
K17 the implications of electro-magnetic fields and the effects on medical devices
K18 the hazards of inhaling welding fumes


All of the items listed below form part of this National Occupational Standard.

1. Personal protective equipment (PPE) for TIG welding operations includes: 

1.1. face mask with appropriate eye protection 
1.2. protective/flame retardant coveralls 
1.3. protective/flame retardant gauntlets 
1.4. steel toe cap boots 
1.5. appropriate vehicle protection 
1.6. appropriate protection for others in the workshop 
1.7. appropriate fume mask

2. Tools and equipment are: 

2.1. workshop equipment 
2.2. generic hand tools 
2.3. manufacturer's specified and specialist tools
2.4. fume extraction equipment

Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

30 Mar 2026





Originating Organisation


Original URN


Relevant Occupations

Engineering, Vehicle Trades

SOC Code



Motor; vehicle; body; TIG; welding; operations;