Kjell Hurtig

A contribution to the study of negative polarity in GMA welding

GMAW using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

A comprehensive model on heat transfer in welded plates is able to calculate the amount of heat losses from the surfaces. A model demands as input...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

Comprehensive models of heat transfer require specification of the total amount of heat received by the workpiece. The objective of this work was t...

A Methodology to Parameterize Wire + Arc Additive Manufacturing : A Case Study for Wall Quality Analysis

The objective of this work was the development of a methodology to parametrize wire + arc additive manufacturing (WAAM), aiming dimension...

A modified Johnson-Cook model for ferritic-pearlitic steel in dynamic strain aging regime

In this study, the flow stress behavior of ferritic-pearlitic steel (C45E steel) is investigated through isothermal compression testing at differen...

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)...

A novel arc heat treatment technique for producing graded microstructures through controlled temperature gradients

This paper introduces a novel arc heat treatment technique to produce samples with graded microstructures through the application of controlled...

A physical simulation technique for cleaner and more sustainable research in additive manufacturing

Additive manufacturing (AM) introduces a new domain for zero waste and cleaner production. Research for verification of materials in AM and effects...

Arc Efficiency for Gas Tungsten Arc Welding DCEN-GTAW

Automation of a robotised metal deposition system using laser melting of wire

This paper presents a system for full automation of free-form-fabrication of fully dense metal structures using robotized laser melting of wire. Th...

Automation of Robotized Laser Metal-Wire Deposition

Bead by bead study of a multipass shielded metal arc-welded super-duplex stainless steel

The present study aims at investigating bead geometry and the evolution of microstructure with thermal cycles in multipass shielded metal arc weldi...

Control Design for Automation of Robotized Laser Metal-Wire Deposition

In this paper a novel approach towards automation of robotized laser metal-wire deposition (RLMwD) is described. The RLMwD technique is being...

Effect of Direct Energy Deposition Process Parameters on Single-Track Deposits of Alloy 718

The effect of three important process parameters, namely laser power, scanning speed and laser stand-off distance on the deposit geometry,...

Effect of HFMI treatment procedure on weld toe geometry and fatigue properties of high strength steel welds

The effects of high frequency mechanical impact (HFMI) treatment procedure on the weld toe geometry and fatigue strength in 1300 MPa yield strength...

Effect of multipass TIG welding on the corrosion resistance and microstructure of a super duplex stainless steel

This is a study of the effect of repetitive TIG (tungsten inert gas) welding passes, melting and remelting the same material volume on microstructu...

Effect of process parameters and heat treatments on delta-phase precipitation in directed energy deposited alloy 718

This article outlines a detailed study of solution treatments and delta precipitation treatments carried out on laser-directed energy deposited (DE...

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 Substrate Orientation on Melt Pool during Multi-Layer Deposition in V-Groove with Gas Metal Arc

Thermo-fluid dynamic and experimental approaches are used to investigate the influence of 20° uphill, downhill and sideway substrate orientation...

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...

Efficient welding of high strength steel

 Producing welds with properties matching those of the steel is a challenge at high strength levels. The present study investigated how cooling rat...

Exposure of FeCrAl Overlay Welds on Superheater Tubes : Influence of Local Environment on Degradation

Two experimental FeCrAl alloy overlay welds on tube shields were exposed in the superheater of a full-size waste fired boiler for 6 months. The tub...

Ferrite content measurement in super duplex stainless steel welds

Approaches to determining ferrite fraction (%) and ferrite number (FN) were examined for super duplex stainless steel (SDSS) welds. A reference...

Freeform Fabrication using Laser Metal-wire Deposition

Heat input and temperatures in welding

A key feature in welding is the energy supplied, in order to join the work pieces together. For all fusion welding methods, the supplied energy is ...

Influence of dilution on properties of high strength steel weld metals

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

The weldability of additive manufactured Alloy 718 was investigated in various heat-treated conditions. The microstructure of the base metal was...

Influence of laser-directed energy deposition process parameters and thermal post-treatments on Nb-rich secondary phases in single-track Alloy 718 specimens

In this article, process parameters such as laser power, deposition speed, and powder feed rate are varied at three levels, and their effect on...

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

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

Investigation on effect of welding parameters on solidification cracking of austenitic stainless steel 314

This study investigates the solidification cracking susceptibility of the austenitic stainless steel 314. Longitudinal Varestraint testing was used...

Measurement of the thermal cycle in the base metal heat affected zone of cast ATI ® 718Plus TM during manual multi-pass TIG welding

This paper presents a method to acquire thermal data in the base metal heat affected zone (HAZ) during manual multi-pass TIG welding of ATI ® 718Pl...

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...

Multipass Autogenous TIG Welding of Super Duplex Stainless

Multipass welding of super duplex stainless steels (SDSS) needs further characterization due to their growing applications inpetrochemical and...

Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel

Nitrogen loss is an important phenomenon in welding of super duplex stainless steels. In this study, a super duplex stainless steel was autogenousl...

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...

Precipitation kinetics of Cu-rich particles in super duplex stainless steels

Complex precipitation behavior of Cu-rich particles (CRPs) was investigated and simulated in continuously cooled and quench-aged super duplex...

Predicting ferrite fractions in single pass super duplex stainless steel welds : thermal cycle analysis and phase transformation modeling

The relationship between welding process parameters, welding thermal cycle, and the final microstructure is of great importance for reliable...

Promoting austenite formation in laser welding of duplex stainless steel-impact of shielding gas and laser reheating

Avoiding low austenite fractions and nitride formation are major challenges in laser welding of duplex stainless steels (DSS). The present research...

Review of Arc Efficiency Values for Gas Tungsten Arc Welding

The aim of this study was to review the literature that specifies arc efficiency values for gas tungsten arc welding (GTAW) and, if possible, propo...

Strength and Impact Toughness of High Strength Steel Weld Metals : Influence of Welding Method, Dilution and Cooling Rate

Producing welds with properties matching those of the steel is a challenge at high strength levels. The present study has investigated how the choi...

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...

Visual feed-back for operator interaction in robotized laser metal deposition

Welding of Large Thickness Super Duplex Stainless Steel : Microstructure and Properties

In this study, Submerged Arc Welding (SAW) and Gas Metal Arc Welding (GMAW) processes were used in multi-pass welding of 33 mm thickness super dupl...

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...