scholarly journals Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment

2018 ◽  
Vol 7 (4) ◽  
pp. 20180018
Author(s):  
K. Abburi Venkata ◽  
S. Khayatzadeh ◽  
A. Achouri ◽  
J. Araujo de Oliveira ◽  
A. N. Forsey ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stress Relaxation ◽  
Postweld Heat Treatment ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Postweld Heat ◽  
Metal Weld

Weldability Evaluation of P87 and 230W Filler Metals in Alloy 230 to Grade P91 Steel Dissimilar Metal Weld

2017 ◽  
Author(s):  
Conner Sarich ◽  
Boian Alexandrov ◽  
Avraham Benatar ◽  
Jorge Penso ◽  
Jerry Kovacich
Keyword(s):  
Stress Relaxation ◽  
Filler Metal ◽  
Tensile Load ◽  
Solidification Cracking ◽  
P91 Steel ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Cracking Mode ◽  
Filler Metals ◽  
Metal Weld

The objective of this study was to perform comparative weldability evaluation of weld filler metals for an Alloy 230 / P91 steel dissimilar metal weld (DMW) that will be used in once through steam generator (OTSG) on an offshore oil platform. The weldability characteristics of filler metals EPRI P87 and Haynes 230W were evaluated using the cast pin tear test (CPTT) and a stress relaxation cracking (SRC) test in combination with metallurgical characterization using light optical and scanning electron microscopy. Solidification cracking susceptibility rankings generated with the CPTT showed that undiluted P87 filler metal had better resistance to solidification cracking than undiluted Alloy 230W. The SRC testing preformed in the Gleeble 3800™ thermo-mechanical simulator showed that none of the tested welds failed in stress relaxation cracking mode during simulated service at 600°C under constant displacement and tensile load at 90% of the high temperature yield strength. During the SRC testing, filler metal 230W exhibited some level of stress relaxation, while no evidence of stress relaxation was found in filler metal P87.

scholarly journals An Empirical Research on Dissimilar Metal Weld of SA335 P11and SA312 TP304 Formed by Metal Inert Gas (MIG) Welding

2019 ◽  
Vol 8 (2) ◽  
pp. 5008-5012
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Functional Limitation ◽  
Material Behavior ◽  
Low Carbon ◽  
Mig Welding ◽  
Metallurgical Properties ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

Development of dissimilar metal welds (DMW) presents itself as an important research domain with respect to the industrial requirements. The joints formed by dissimilar metals should have superior metallurgical properties and an ability to withstand severe operational conditions. Due to difference in composition and properties, DMW formed between stainless steel and low carbon alloy exhibits functional limitation under heterogeneous working conditions and leads to components failure. The present empirical study investigates mechanical and metallurgical properties of dissimilar metal weld of SA312 TP304 alloy and SA335 P11 stainless steel that is formed by MIG welding. The mechanical and metallurgical properties of the weld are investigated using tensile test, hardness measurement and microstructural observations. Characterization of as-welded and heat-treated weld specimen has also been conducted to determine effect of heat treatment on material behavior. The lower tensile strengths was measured in MIG welded joints than base metals. The significant decrease in ultimate strength is observed in heat treatment specimens compared to as-welded specimens. In contrary, all regions of treated joints revealed higher hardness than the as-welded joint

Residual Stress Predictions on a 29″ Narrow Gap Dissimilar Metal Weld and Comparison With a 14″ Configuration

2012 ◽  
Author(s):  
Stéphan Courtin ◽  
Xavier Ficquet ◽  
Thi Thuy Trang Lê ◽  
Philippe Gilles ◽  
Miguel Yescas
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Post Weld Heat Treatment ◽  
Thickness Effect ◽  
Narrow Gap ◽  
Welding Simulation ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld ◽  
Weld Heat

AREVA has developed narrow gap weld techniques to perform junctions between low alloy steel heavy section components and austenitic stainless steel piping systems. In parallel, for a good understanding of welding and post weld heat treatment consequences, numerical welding simulation has already demonstrated its relevance to predict residual stress fields in welded components [1]. This paper presents Finite Element (FE) simulations of a 29″ multipass narrow gap Dissimilar Metal Weld (DMW) configuration, the welding simulation including non linear kinematic hardening models, phase transformations and visco-plastic calculations for reproducing the post weld heat treatment. The numerical results are compared to measurements obtained by the deep hole drilling technique [2]. This work gives another evidence of the relevance of the numerical welding simulation. Particularly, the comparison with a 14″ configuration [3] gives some elements to assess on the validity of both numerical and experimental techniques and on the weld thickness effect.

A crack-location correction for T0 analysis of an alloy 52 dissimilar metal weld

2019 ◽  
Vol 214 ◽  
pp. 320-334 ◽  
Author(s):  
Sebastian Lindqvist ◽  
Matias Ahonen ◽  
Jari Lydman ◽  
Pentti Arffman ◽  
Hannu Hänninen
Keyword(s):  
Crack Location ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

Brittle Fracture Analysis of a Dissimilar Metal Weld

2013 ◽  
Author(s):  
A. Blouin ◽  
S. Chapuliot ◽  
S. Marie ◽  
J. M. Bergheau ◽  
C. Niclaeys
Keyword(s):  
Brittle Fracture ◽  
Weld Joint ◽  
Threshold Stress ◽  
Base Alloy ◽  
Welding Process ◽  
Loading Conditions ◽  
Brittle To Ductile Transition ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

One important part of the integrity demonstration of large ferritic components is based on the demonstration that they could never undergo brittle fracture. Connections between a ferritic component and an austenitic piping (Dissimilar Metal Weld — DMW) have to respect these rules, in particular the Heat Affected Zone (HAZ) created by the welding process and which encounters a brittle-to-ductile transition. Within that frame, the case considered in this article is a Ni base alloy narrow gap weld joint between a ferritic pipe (A533 steel) and an austenitic pipe (316L stainless steel). The aim of the present study is to show that in the same loading conditions, the weld joint is less sensitive to the brittle fracture than the surrounding ferritic part of the component. That is to say that the demonstration should be focused on the ferritic base metal which is the weakest material. The bases of this study rely on a stress-based criterion developed by Chapuliot et al., using a threshold stress (σth) below which the cleavage cannot occur. This threshold stress can be used to define the brittle crack occurrence probability, which means it is possible to determine the highest loading conditions without any brittle fracture risk.

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