Role of residual stresses on fracture properties of under-matched butt weld

Rak, Inoslav; Gliha, Vladimir

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Title:	Role of residual stresses on fracture properties of under-matched butt weld
Authors:	ID Rak, Inoslav (Author) ID Gliha, Vladimir (Author)
Files:	http://www.dlib.si/details/URN:NBN:SI:doc-ZNTCUCGZ
Language:	English
Work type:	Not categorized
Typology:	1.01 - Original Scientific Article
Organization:	FS - Faculty of Mechanical Engineering
Abstract:	Under-matched weld joints were adopted for producing a penstock of 47 mm wall thickness and 4200 mm diameter, to improve the weldability. The isothermal Robertson wide plate test on the under-matched weld joints, were the allowable stress level was 0.6 of the yield stress, proved that the longitudinal stresses caused the crack propagation alog the weld joint to deviate into tough base material where it was arrested. The arrest temperature was between -10 and -20°C. The behaviour of the crack propagation was the reason to omit the thermal stress relieving of the pipe section and on circumferential weld joints executed on this side. One can always take into consideration the role of axial residual stresses when assessing whether to use, or not, under-matched weld joints in severer loaded structures.
Keywords:	strjeni zvar z nižjo mejo tečenja, zaostale napetosti, potek loma, lastnosti ujetja, lomna žilavost, under-matched weld joint, residual stresses, fracture path, arrest properties, fracture toughness
Publisher:	Inštitut za kovinske materiale in tehnologije
Year of publishing:	1999
Number of pages:	str. 437-441
Numbering:	Letn. 33, št. 6
PID:	20.500.12556/DKUM-53258
UDC:	621.791.05:539.42:539.55
ISSN on article:	1318-0010
COBISS.SI-ID:	203434
NUK URN:	URN:SI:UM:DK:CPSABHC8
Publication date in DKUM:	10.07.2015
Views:	1582
Downloads:	47
Metadata:
Categories:	Misc.
:	RAK, Inoslav and GLIHA, Vladimir, 1999, Role of residual stresses on fracture properties of under-matched butt weld. Kovine zlitine tehnologije [online]. 1999. Vol. 33, no. 6, p. 437–441. [Accessed 18 March 2025]. Retrieved from: http://www.dlib.si/details/URN:NBN:SI:doc-ZNTCUCGZ Copy citation

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Record is a part of a journal

Title:	Kovine zlitine tehnologije
Shortened title:	Kovine zlit. tehnol.
Publisher:	Inštitut za kovinske materiale in tehnologije
ISSN:	1318-0010
COBISS.SI-ID:	31742209

Secondary language

Language:	English
Title:	Vloga zaostalih napetosti na lomne lastnosti trdnostno nižjega strjenega zvara
Abstract:	Izbran je bil zvarni spoj z nižjo mejo tečenja v strjenem delu zvara za izdelavo tlačnega cevovoda z debelino stene 47 mm in premerom cevi 4200 mm zaradi izboljšave varivosti. Izotermni Robertsonov preizkus izveden na zvarnem spoju obremenjenem z dopustno napetostjo 0,6 meje tečenja je dokazal, da so vzdolžne zaostale napetosti povzročile odmik širjenja razpoke v žilav osnovni material, kjer se je lom ujel. Temperatura ujetja je bila med -10 in -20°C. To dogajanje je bilo vzrok za izpustitev termičnega popuščanja zaostalih napetosti na sekcijah cevi in radialnih zvarnih spojih izvedenih na montaži. Zaostale vzdolžne napetosti je vedno možno upoštevati pri ocenitvi uporabe strjenega zvara z nižjo mejo tečenja od osnovnega materiala za visoko obremenjene konstrukcije.

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