Pipe welder

Knowledge

K1: The mechanical properties (strength, ductility, toughness, etc.), physical properties (dimensions, weight, corrosion susceptibility, contamination) of commonly welded materials. Back to Duty

K2: The fundamentals of welding metallurgy (Weld Metal Solidification and Heat Affected Zone) and how this can affects weldability of materials and final joint integrity Back to Duty

K3: The common manual arc welding processes and the relative merits for a given application including Tungsten Inert Gas (TIG), Manual Metal Arc (MMA), Plasma Arc Welding (PAW), Metal Inert Gas (MIG), Metal Active Gas (MAG), Flux Cored Arc Welding (FCAW) Back to Duty

K4: Pipe and tube weld joint types (Butt, Socket, Set-on Branch, Set-In Branch, Set-Through Branch, Flange) and the relative merits of the multiple preparation types (e.g. J-, V-, U- and double/triple compound angles) and their effect on pre-welding pipe preparation times, weld shrinkage, restrictive access to the pipe weld preparation, welding technique to be adopted and risk of causing defects during welding production. Back to Duty

K5: The welding positions and progression directions associated with welding pipe e.g. Rotated Pipe; Horizontal - Fixed Vertical Pipe; Vertical Weld - Fixed Horizontal Pipe (either upward or downward progression); Inclined - Fixed 45 degree Pipe Overhead (either upward or downward progression). Back to Duty

K6: Pipe bore contamination and how weld root profile affects product performance in service (corrosion, erosion, flow restriction, post-weld conditioning treatments, product contamination (e.g. food, beverage, pharmaceutical) or damage to other components within the piping system (e.g. valves/turbines) Back to Duty

K7: Welding controls to establish and maintain the key primary parameters associated with the welding process (e.g. Current, Arc  Voltage, Wire Feed Speed, Shielding Gas Flow Rates, Electrode Polarity etc.) Back to Duty

K8: The major components of welding equipment, ancillary equipment, cabling and their assembly, including Power Source, Wire Feed System, TIG & PAW Arc Initiation Systems, interconnecting communications cables, torches, tongs, gas equipment etc. Back to Duty

K9: Purging systems and damming mechanisms, including their relative merits and limitations, locating relative to the weld and subsequent removal from the piping system (e.g. dams, bungs, foams, ashless paper, soluble films etc.) Back to Duty

K10: Purging gas selection and its relative merits for a given material and weld location/orientation within a piping system, considering its buoyancy, leakage path, risk of asphyxiation, reaction with the molten weld pool and potential effect on weld metal properties. Back to Duty

K11: The relative merits of purge gas injection into the bore to consider the route of gas supply, orifice diameter, volume to be purged, flow rate, acceptable oxygen levels, turbulence effects, waiting time to achieve specified levels and trigger point for withdrawal of purge protection from pipe bore Back to Duty

K12: Flux based bore side root protection mechanisms (bore side fluxes, pastes, flux-carrying consumables such as flux coated and flux-cored rod stock (e.g. MMA, TIG, FCAW etc.), deoxidants within solid wires) and their relative merits, limitations and risks (post weld conditioning processes, foreign material exclusion requirements, product media contamination, downstream component degradation). Back to Duty

K13: Welding Procedure Specification requirements, content and information derived to establish specific production information Back to Duty

K14: Welder Approval Certificates content and definitions to determine scope of coverage Back to Duty

K15: Mechanisms to measure, monitor and control secondary welding parameters (e.g.  Bore Cleanliness, Bore side Oxidation, Heat Input, Interpass Temperature), linear shrinkage Back to Duty

K16: Identification and the causes of typical welding defects and how their occurrence can be reduced. Back to Duty

K17: Different types and functions of welding consumables and the requirement for correct identification, storage, conditioning, handling and recycling or disposal. Back to Duty

K18: The requirements for correct storage, handling and segregation of materials and tooling to prevent cross contamination between sensitive materials Back to Duty

K19: When and how to use material removal processes (powered and non‐powered tools) Back to Duty

K20: Supporting activities often provided by others and must be checked to ensure the successful production of pipe welding activities (bore alignment, ovality, bore contamination, fitting, purging, thermal treatment). Back to Duty

K21: Welding quality documentation, organisational reporting systems, procedures and their role within the overall quality process Back to Duty

K22: Performance success factors in production, inspection reporting, productivity, bore cleanliness/contamination Back to Duty

K23: Risks and mitigation measures associated with welding and the working environment, and the organisational risk management processes Back to Duty

K24: Statutory, quality, organisational and health, safety and environmental regulations Back to Duty

K25: Typical problems that may arise within their normal work activities/environment Back to Duty

K26: Organisational systems to control and administer approved processes, procedures, documentation and the potential implications for the organisation if not followed. Back to Duty

K27: Continuous improvement processes, performance review and how this is undertaken within their organisation. Back to Duty

K28: Non-destructive testing reports and radiographs including identification of particular defect types and the associated improvements to process and techniques needed to prevent recurrence Back to Duty

Skills

S1: Work safely at all times, comply with health & safety and environmental legislation, regulations and organisational requirements Back to Duty

S2: Obtain, check and use appropriate documentation (such as job instructions, drawings, quality control documentation) Back to Duty

S3: Plan all preparatory tasks and interfaces and pipe welding activity, before commencing work Back to Duty

S4: Obtain, position and assemble welding equipment and associated safety protection needed for each activity Back to Duty

S5: Prepare, check and protect materials and work areas ready for welding Back to Duty

S6: Inspect the assembly to be welded and undertake remedial work to comply with specification, or implement quality steps if rejected Back to Duty

S7: Receive, inspect, condition and maintain consumables Back to Duty

S8: Set, test, and monitor key welding parameters as detailed within the Welding Procedure Specification and adjust as necessary to accommodate changing orientation as the weld progresses around the pipe joint. Back to Duty

S9: Set-up purge protection within the pipe bore and associate monitoring methods Back to Duty

S10: Set-up bore side protection controls to avoid foreign material ingress into the pipe bore Back to Duty

S11: Remove materials using manual processes, including powered and non-powered equipment Back to Duty

S12: Achieve a quality of work to meet international standards e.g. ISO 5817, ISO 9606, ASME IX, ASME B31.3 for dimensional, surface inspection (e.g. Visual, Magnetic Particle, Dye Penetrant) and volumetric inspection (e.g. Radiography, Ultrasonic inspection, including Time of Flight and Phased Array methods). Back to Duty

S13: Monitor weld quality and dimensions throughout welding activity and on completion of welding and report any issues through organisational production / quality control process prior to release for formal examination by others Back to Duty

S14: Restore the work area on completion of the activity and where applicable return any resources and consumables to the appropriate location Back to Duty

S15: Deal promptly and effectively with problems within the limits of their responsibility using approved diagnostic methods and techniques Back to Duty

S16: Complete any required documentation using the defined recording systems at the appropriate stages of the work activity Back to Duty

S17: Produce pipe welds using two welding processes from TIG, PAW, MMA, MIG/MAG, FCAW Back to Duty

S18: Produce pipe welds using four material groups from Carbon Steel, Low Alloy Steel, High Alloy Ferritic/Martensitic Steel, Austenitic Stainless Steel, Nickel & Nickel Alloys, Aluminium & Aluminium alloys, Titanium & Titanium Alloys, Copper & Copper Alloys Back to Duty

S19: Produce pipe welds covering ALL defined pipe welding positions. These are Flat - Rotated Pipe; Horizontal - Fixed Vertical Pipe; Vertical Weld - Fixed Horizontal Pipe (either upward or downward progression); Inclined - Fixed 45 degree Pipe Overhead (either upward or downward progression) Back to Duty

S20: Produce pipe welds in 3 main joint configurations from Single Sided Butt, Socket, Flange and Set-on Branch. Back to Duty

S21: Produce pipe welds in by continually adjusting the orientation of the welder, welding torch, and welding consumable filler, including restricted access conditions Back to Duty

S22: Produce pipe welds in restricted access conditions by welding with both left and right hands (e.g. boiler tube bundles, proximity of other plant and equipment, limited access locations, welds located with limited visibility of the weld joint) Back to Duty

Behaviours

B1: Takes responsibility for decision-making, without autonomy and within the guidelines of the work instruction, for their workplace, the application of welding processes, and for their productivity Back to Duty

B2: Enquires and seeks guidance, in order to understand the processes and associated industrial applications. Back to Duty

B3: Committed to maintaining competence through Continuing Professional Development planning, preparation and reflection to ensure safety, quality and production and ensuring Continuing Professional Development goals are achieved. Back to Duty

B4: Intervene and challenge poor practice and have confidence to channel feedback to the appropriate authorities to implement change. Back to Duty

B5: Consistently and reliably deliver expectations in safety, production, quality, ethics and self-development Back to Duty

B6: Encourages and supports the development of others and completes point of work risk assessments. Back to Duty

B7: Follows the specified procedures and controls and be personally responsible and accountable for their production work and personal development Back to Duty

B8: Reflect on current and past performance and provide information and recommendations for continuous improvements in efficiency and effectiveness of working practices, and training and development requirements Back to Duty