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Metallurgical Impact of Minor Elements in Steel Welds

  • 15 Nov 2021
  • 2:00 PM - 5:30 PM
  • Online
  • 416


  • Customers of TWI Training School

Registration is closed

A Materials Technical Group Webinar

Due to global popular demand, we are re-running this popular event first delivered in May this year.

The properties of steels and steel welds are influenced by many factors. Certain elements when present can punch well above their weight. In many cases these effects are well understood and are used to positive effect. However the mechanisms and trends can be complicated and consequently pitfalls can and do arise.

This webinar will focus on elements in steels that are present in small quantities but whose impact can be highly significant with problems often only come to light at the stage of weld procedure qualification or worse still, during construction or service. 


  • Professional Members of The Welding Institute: £25 + VAT (£30)
  • Industrial Members of TWI: £25 + VAT (£30)
  • Non-members: £95 + VAT (£114)
  • Retired Members: £25 + VAT (£30)
  • Students: £25 + VAT (£30)
  • TWI Training School Customers: £70 + VAT (£84)
  • TWI Staff - please contact Becki Parratt if you wish to register

Please note that payment must be made before the event in order to receive the joining instructions for the event.


Registering on this Technical Group webinar as a non-member or a TWI Training Customer gives you full Associate Membership (AWeldI) for one year. To activate your membership, just complete the highlighted fields on the event registration form.

You will also benefit from:


  • Information transfer from experts
  • Discussion, questions and answers on the specific topics
  • A broader understanding of the extent of standards in the industry
  • Attendance of this event qualifies for CPD



The Welding Institute awards points towards CPD for delegates attending this webinar. Every hour attendance of an event will earn 2 points towards your continuing professional development.


Joanna Nicholas

Metallurgy, Materials and Structural Integrity Group Team Manager


Presentation Title: Microalloying – a brief history and Some thoughts on impurities in carbon steels

Joanna joined TWI in 1999, and has been involved in research, materials selection and failure investigations, mainly with ferritic steels. Joanna has also supported engineering critical assessment activities by undertaking post-test metallographic assessment on fracture toughness test specimens. She has also been involved in various aspects of computer modelling, particularly for research projects.

Joanna has broad knowledge of ferritic steels with particular emphasis on hydrogen cracking and hydrogen diffusion, HAZ hardness, mooring chain, fasteners, in-service welding and 9% Ni steels. She has carried out numerous investigations in these areas including failure investigation as well as production qualification and research. She currently serves on several BSI committees, providing welding and metallurgy input to the standards as required. Joanna lectures on the IIW/EWF diploma, and provides training and mentoring in other areas of welding metallurgy specialisms.

Joanna was awarded CEng in 2005, IWE in 2016, FWeldI in 2017 and FIMMM in 2018. Joanna is a STEM Ambassador, and delivers various activities to local schoolchildren, aiming to retain their interest in science, technology, engineering and mathematics, and was awarded the Welding Institute/Armourers and Brasiers Award for Best STEM Ambassador in 2015.

Dr Phil Kirkwood

Managing Director

Micro-Met International Ltd

Presentation Title: Carbon equivalent formulae - knowns and unknowns

Dr Kirkwood joined the Colvilles research organisation in Motherwell, where he worked in a group engaged in both high temperature properties and brittle fracture research.

Dr Kirkwood spent most of 1971 on secondment living in Niteroi in Brazil as an assistant welding engineer working on the fabrication of the steel centre spans for the Rio-Niteroi Bridge and on his return to England he joined a newly formed Welding group, within the steel industry, on Teesside, England, and quickly became heavily involved in studying various aspects of the weldability of structural and linepipe steels.

For the remainder of the 1970’s he continued to work for British Steel and published some 60 technical papers covering various aspects of the development and welding of steels for offshore structures and high strength pipelines. In 1980 his ongoing contributions to welding technology were further recognised by the award of the TWI Leslie Lidstone Esab Gold Medal.

Dr Kirkwood is currently retained by Companhia Brasileira de Metalurgia e Mineracao (CBMM) as an advisor on welding related activities and am particularly concerned with publicising the advantages of lower carbon steels and demonstrating how this approach allows more effective use of niobium in a wide range of HSLA steels for linepipe, structural and pressure vessel applications.

His overall career contribution was recently recognised by the award of the CBMM, Charles Hatchett - Life Time Achievement Medal in July 2016.

Eur Ing Alan Denney

Consultant Metallurgist/Welding Engineer

AKD Materials Consulting Ltd

Presentation Title: Centreline plate segregation cracking

Alan Denney is a freelance consultant in materials and welding. He has over 50 years’ experience in materials, welding and corrosion issues. prior to setting up his consultancy in 2012 he had major roles with Saipem, Wood Group, Kvaerner, John Brown and Arup. His broad experience covers offshore oil and gas platforms and pipelines, terminals, process engineering projects, building structures, nuclear reprocessing, naval ships, submarines and offshore wind farms.

Alan has a BSc in Metallurgy and an MSc in Welding Technology. He is a Chartered Engineer, a European Engineer and an International Welding Engineer.

Martin Connelly

Technical Director

Liberty Pipes (Hartlepool) Ltd

Presentation Title: Weldability considerations affecting seam welding of modern SAW linepipe

After graduating from the University of Strathclyde with a degree in Metallurgy and Engineering Materials, Martin has worked in the steel industry for nearly 30 years, first with British Steel, then Corus, Tata and finally Liberty Pipes. His experience covers welding, steel design, mechanical testing, pipe forming, operations, product development, NDT and many other aspects of SAWL pipe making. With this background, Martin has led the technical and quality aspects of the manufacture of more than 2million tonnes of line pipe. He is a member of the EPRG Plenary and Materials committees, as well as sitting on the API Task Group on Line Pipe and Task Group on Oil Country Tubular Goods, where his expertise is used to develop line pipe standards and developments.

Dr Graeme Barritte

Senior Lecturer

Cranfield University

Presentation Title: The effect of inclusions in the development of weld metal microstructure

Technical manager for various welding supply companies. Involved in the design of high toughness welding consumables for critical offshore and power generation industries.

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