Measurement and numerical simulation of angular distortion of fillet welded T-joints – Welding angular distortion control by transformation expansion of weld metals (Report 1) –

Mikami, Yoshiki; Mochizuki, Masahito; Toyoda, Masao; Morikage, Yasushi

doi:10.1080/09507110701637833

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…This would result in Ract-values below the singularity at σu = 0 MPa having a rather distracting effect on the illustration. The described change in stress concentration with respect to nominal loading and angular welding distortion goes along with a shift in the actual stress ratio R act at the weld toe; see Equation (12) and Figure 18b. The initial clamping stress due to angular distortion has a very large impact, as it changes the mean stress directly.…”

Section: Fitted Parametermentioning

confidence: 95%

“…Therefore, numerous recent publications deal with the estimation of welding distortion using transient thermo-mechanical simulation techniques or inherent strain methods [9][10][11]. In [12] measurements as well as numerical simulations to evaluate the angular distortion of fillet welded T-joints made of steel were presented. The numerical results revealed that phase transformations significantly affect the final state of distortion.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

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In general, distortion has significant effects on the assembly process of welded structures and remarkable influences on the strength of the welds. Therefore, this work focuses on the effect of angular welding distortion on fatigue strength to improve transferability of specimen results to components. Experimental investigations cover manufacturing and fatigue testing of three single-sided transversal stiffeners series exhibiting different angular distortions. The fatigue test results of as-welded specimen show a distinct link between fatigue performance and initial angular distortion. However, in case of a high frequency mechanical impact (HFMI)-treated weld toe, the fatigue strength increases up to base material level and is independent of the distortion. A comprehensive numerical analysis reveals a complex interaction between the applied nominal load, initial specimen distortion and the local stress field. In this context, an engineering-feasible assessment is derived to estimate the local effective stresses featuring the acting local stress range as well as the stress ratio. The application of this distortion factor enables the setup of a uniform S/N-curve with a significantly reduced scatter band.

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Section: Fitted Parametermentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

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“…In der Literatur werden die Low‐Transformation‐Temperature‐Schweißzusatzwerkstoffe oft mit einer Reduktion des Verzuges bei Metallschutzgasprozessen in Verbindung gebracht. Numerische und experimentelle Untersuchungen zum Einfluss der Phasenumwandlung auf den Verzug bereits durchgeführt. Dabei konnte bei einlagigen Kehlnahtschweißungen eine Reduzierung des Winkelverzugs mit einem Low‐Transformation‐Temperature‐Zusatzwerkstoff im Gegensatz zu einem konventionellen Zusatzwerkstoff erreicht werden.…”

Section: Stand Der Technikunclassified

“…Dieser Effekt ist bereits für den Metallschutzgasschweißprozess (MSG) nachgewiesen worden. Dabei wurde ein Low‐Transformation‐Temperature‐Draht verschweißt und ermittelt, bei welcher Temperatur das Schweißgut (Mischung zwischen Grundwerkstoff und Zusatzwerkstoff) in Martensit umwandelt . Eine Steuerung des Umwandlungszeitpunktes des Schweißgutes von Austenit in Martensit ist prozessbedingt bei diesem Verfahren nur eingeschränkt möglich, da die Abkühlung der Schweißnaht direkt von den Metallschutzgasschweißprozess‐Prozessparametern wie Stromstärke bzw.…”

Section: Introductionunclassified

Nutzung von Low‐Transformation‐Temperature‐Werkstoffen (LTT) zur Eigenspannungsreduzierung im Elektronenstrahlschweißprozess

Reisgen

Olschok

Gach

2016

Materialwissenschaft Werkst

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Zur Reduzierung des Verzugs und der Zugeigenspannung in Schweißnähten an Kohlenstoff-Mangan-Stählen wurden Low-Transformation-Temperature Werkstoffe (LTT) konzipiert. Sie bedienen sich des Volumenexpansionseffekts während einer martensitischen Umwandlung, diese Volumenexpansion wirkt der Volumenschrumpfung während der Abkühlung entgegen. Die positiven Effekte dieser Low-Transformation-Temperature-Legierungen auf die Zugeigenspannungsbelastung wurden in verschiedenen Untersuchungen bewiesen. Die Low-Transformation-Temperature-Werkstoffe wurden bisher großvolumig als Zusatzmaterial in Lichtbogenschweißprozessen eingesetzt. Der Einsatz modulare Wärmefelder des Elektronenstrahlprozess bietet das Potenzial eines zeitlich aktivierten Einsatzes der Druckspannungsinduzierung durch Phasenumwandlung der Low-Transformation-Temperature-Legierungen. Ziel ist eine in-situ Einflussnahme auf den Schweißeigenspannungszustand und damit den Verzug komplexer Bauteile. Vorgestellt wird in einem ersten Ansatz das Verhalten eines Low-Transformation-Temperature-Werkstoffs im Elektronenstrahlprozess.Schlüsselwörter: Elektronenstrahlschweißen (EBW) / Low-Transformation-Temperature (LTT) Werkstoff / Eigenspannungsreduzierung / Verzug / metallurgische Injektion Low-Transformation-Temperature materials (LTT) were designed to reduce delay as well as residual tensile stress in welds on carbon-manganese steels. Using the volume expansion effect during a martensitic transformation these materials counteract the volume shrinkage during cooling. While this positive effects on residual stress relief by Low-Transformation-Temperature-alloys has been proven in various studies, these alloys have always been used in large volumes as additional filler material in electric arc welding processes. Modular heat fields initiated by an electron-beam-welding-process offers the potential of a time-activated initiation of compressive stresses triggered by phase transformation of Low-Transformation-Temperature-alloys. Developing a technology able to reduce residual stress and thus the deformation of complex welded components is the aim. The first approach of Low-Transformation-Temperature-material used in the electron beam process and its behaviour is presented here.

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Influence on martensite‐start‐temperature and volume expansion of low‐transformation‐temperature materials used for residual stress relief in beam welding

Reisgen

Olschok

Sharma

et al. 2017

Materialwissenschaft Werkst

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Low-transformation-temperature materials (LTT) are used as high-alloy welding filler material for high-strength steels in order to minimize the tensile stresses and resulting distortion of the component during the welding process. The increase in the volume of the structure produced during martensitic transformation is utilized in order to counteract the volume shrinkage due to the cooling process. As stated in the field of study various elements influence the starting temperature of the martensite transformation, the influence on the volume expansion during the martensite formation is unknown. The influence of alloying elements nickel and chromium on the conversion behavior of low-transformation-temperature materials is to be investigated in detail. In particular, the effect of the variation of the mentioned elements on the starting temperature of the martensitic phase transformation and the extent of the volume expansion associated with that is investigated. In addition, the change in the hardness of the different low-transformation-temperature alloys is recorded and compared.

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Measurement and numerical simulation of angular distortion of fillet welded T-joints – Welding angular distortion control by transformation expansion of weld metals (Report 1) –

Cited by 11 publications

References 20 publications

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Nutzung von Low‐Transformation‐Temperature‐Werkstoffen (LTT) zur Eigenspannungsreduzierung im Elektronenstrahlschweißprozess

Influence on martensite‐start‐temperature and volume expansion of low‐transformation‐temperature materials used for residual stress relief in beam welding

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