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Maria Asuncion Valiente Bermejo

Universitetslektor

Anställd på Avdelningen för svetsteknologi.

Forskar inom området teknik, produktionsteknik.


Research interest

I am a researcher in the Welding Technology group. Welding runs through my veins! When I was born my father worked as a welder and soon afterwards he ran his own welding company, so during my childhood it was easy to catch me behind the welding mask peering the performance of new welding machines and trying to help my father, when at that time I was more a nuisance!! But it was so amazing to discover how two solid metals under the sparks were able to be a single solid one! That curiosity and interest for metals made me drive my way from my Chemistry studies at university, the Master in welding, the International Welding Engineer, the PhD in welding of stainless steels and up to my current my research work at Högskolan Väst.

My research has focused on the welding metallurgy of austenitic stainless steels, looking into the solidification modes, the prediction of ferrite content and the solidification cracking risk when using low energy welding methods.

Afterwards I moved towards the welding metallurgy of duplex stainless steels and studied on their microstructure, properties and thermal cycles experienced during multi-pass welding. That knowledge was essential when jumping into our more recent projects involving Additive Manufacturing of duplex stainless steels. Currently I am working in additive manufacturing of special alloys and also in the optimization of stainless steel claddings for the power generation industry.  

External assignments

  • Since April 2014: Vice-Chair of subcommission IX-H (Welding of stainless steels and nickel-base alloys) of the International Institute of Welding.
  • Since 2018: Member of the Editorial Board of the journal Welding in the World.
  • Since July 2019: Chair of the Study Group “Research and Collaboration” at the International Institute of Welding.
  • Since September 2019: Member of the Institutional Board (Institutionsnämnden) for the Engineering Department at Högskolan Väst.
  • Since July 2020: Member of the Technical Management Board of the International Institute of Welding.

Teaching / supervision

As a teacher and supervisor it is essential for me to inspire the students with the desire to learn and to awake their curiosity and interest for the contents of the lectures and labs. I always do my best to catch the students’ attention and to get them motivated and engaged since the very first minute.

Digital media are always present in my teaching: videos, animations and images help me to introduce the topic and in turn allow me to catch students’ preconceived ideas. I am currently working towards the incorporation of virtual reality in our welding labs.

Since 2018, I am the course responsible, coordinator and Examiner of the Welding Metallurgy course (SVM700) in the Advanced Manufacturing Master program.

Examiner and course responsible of the ProdEx course IPS600: Integrated Project Work on Welding Technology since 2020.

My past teaching contributions:

In 2017 I collaborated in the Mechanical Engineering program with a guest lecture in the undergraduate course Manufacturing Course (TVT200), and in the Master in Manufacturing Engineering I contributed with lectures in the course Advanced Materials Science (AVM600) and I was teacher and examiner in the Advanced Production Technology I (AVP700) course.

In 2018-2019, also in the Master level I developed the steel and aluminum contents of the Advanced Materials Science course (AMT601).

I have been supervising master students, international Bachelor students and I am currently supervising 2 PhD students.

Keywords

Welding, additive manufacturing, stainless steels, duplex stainless steels, austenitic stainless steels.

Research gate

Media

Article: International researcher strengthens welding research

Article: Asun Valiente, Researcher in welding

Article: Industrinära spetsutbildning på Högskolan Väst

Article: Premi de prestigi mundial per a una molletana

Video: About the research environment Production Technology West, University West, Trollhättan, Sweden

Publications

Publikationer


Hot-Wire Laser-Directed Energy Deposition : Process Characteristics and Benefits of Resistive Pre-Heating of the Feedstock Wire

Publicerat

Hot-Wire Laser-Directed Energy Deposition : Process Characteristics and Benefits of Resistive Pre-Heating of the Feedstock Wire

This study investigates the influence of resistive pre-heating of the feedstock wire (here called hot-wire) on the stability of laser-directed ener...

Microstructure of laser metal deposited duplex stainless steel : Influence of shielding gas and heat treatment

Publicerat

Microstructure of laser metal deposited duplex stainless steel : Influence of shielding gas and heat treatment

This research work is the first step in evaluating the feasibility of producing industrial components by using Laser Metal Deposition with duplex...

A New Approach to the Study of Multi-Pass Welds–Microstructure and Properties of Welded 20-mm-Thick Superduplex Stainless Steel

Publicerat

A New Approach to the Study of Multi-Pass Welds–Microstructure and Properties of Welded 20-mm-Thick Superduplex Stainless Steel

Type 2507 superduplex stainless steel 20 mm in thickness was multi-pass-welded with Gas Metal Arc Welding (GMAW) and Flux-Cored Arc Welding (FCAW)...

Computational thermodynamics in ferrite content prediction of austenitic stainless steel weldments

Publicerat

Computational thermodynamics in ferrite content prediction of austenitic stainless steel weldments

In this paper, four computational approaches using Thermo-Calc and DICTRA have been used to calculate the ferrite content of a set of austenitic...

Teaching Welding with a Flipped Classroom Approach

Publicerat

Teaching Welding with a Flipped Classroom Approach

Wire-arc additive manufacturing of a duplex stainless steel : thermal cycle analysis and microstructure characterization

Publicerat

Wire-arc additive manufacturing of a duplex stainless steel : thermal cycle analysis and microstructure characterization

The evolution of microstructures with thermal cycles was studied for wire-arc additive manufacturing of duplex stainless steel blocks. To produce...

Influence of multiple thermal cycles on microstructure of heat-affected zone in TIG-welded super duplex stainless steel

Publicerat

Influence of multiple thermal cycles on microstructure of heat-affected zone in TIG-welded super duplex stainless steel

The influence of heat input and multiple welding cycles on the microstructure of the heat-affected zone in autogenously TIG-welded 6 mm 2507 type...

Influenza del gas di protezione sul comportamento e le proprietà  di giunti sa dati di acciai duplex e superduplex : Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

Publicerat

Influenza del gas di protezione sul comportamento e le proprietà  di giunti sa dati di acciai duplex e superduplex : Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

The influence of shielding gases on welding performance and on properties of duplex and superduplex stainless steel welds was studied. Using argon ...

Monitoring Thermal Cycles in Multi-pass Welding

Publicerat

Monitoring Thermal Cycles in Multi-pass Welding

Differently from any previous investigation in welding, this research work presents a novel development that allows temperature to be measured and...

Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

Publicerat

Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

The influence of shielding gases on welding performanceand on properties of duplex and superduplex stainlesssteel welds was studied. Using argon as...

Effect of welding position on properties of duplex and superduplex stainless steel circumferential welds

Publicerat

Effect of welding position on properties of duplex and superduplex stainless steel circumferential welds

The influence of welding position on properties ofduplex and superduplex stainless steel welds was studied. Circumferential pipe welds were produce...

Guia de les escultures de Mollet del Vallès : Metalls, tècniques i curiositats

Publicerat

Guia de les escultures de Mollet del Vallès : Metalls, tècniques i curiositats

This publication presents a comprehensive study on the current 35 metal artwork pieces located in public spaces of Mollet del Vallès. The sculpture...

Relevance and limitations of arc furnace casting in welding research

Publicerat

Relevance and limitations of arc furnace casting in welding research

The arc furnace melting technique is widely used for positive material identification in the industry of welding consumable manufacturing. It is al...

Towards a Map of Solidification Cracking Risk in Laser Welding of Austenitic Stainless Steels

Publicerat

Towards a Map of Solidification Cracking Risk in Laser Welding of Austenitic Stainless Steels

In this work, two series of specimens with Hammar and Svensson's Cr- and Ni-equivalents (Creq+Nieq) = 35 and 45 wt% were used to cover a wide range...

Optimising Quality and Productivity in Welding of Duplex and Superduplex Stainless Steels

Publicerat

Optimising Quality and Productivity in Welding of Duplex and Superduplex Stainless Steels

The aim of this work was to study the influence of shielding gases and welding positions on properties of duplex and superduplex stainless steel...

Influence of low energy laser welding on solidification and microstructure of austenitic stainless steel welds

Publicerat

Influence of low energy laser welding on solidification and microstructure of austenitic stainless steel welds

Primary austenitic solidification is related to increased hot cracking susceptibility in welding of austenitic stainless steels. It is also...