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Title:
LOMNA ŽILAVOST VISOKOTRDNOSTNIH ZVARNIH SPOJEV
Authors:
ID
Vizlar, Boštjan
(Author)
ID
Praunseis, Zdravko
(Mentor)
More about this mentor...
ID
Avsec, Jurij
(Comentor)
Files:
VS_Vizlar_Bostjan_2012.pdf
(7,35 MB)
MD5: 9B6386ECAF261E191647CCA932F586EC
PID:
20.500.12556/dkum/94dc6361-0da0-401b-b667-80a65eaf8339
Language:
Slovenian
Work type:
Bachelor thesis/paper
Typology:
2.11 - Undergraduate Thesis
Organization:
FE - Faculty of Energy Technology
Abstract:
Glede na varivost poboljšanih visokotrdnostnih malolegiranih konstrukcijskih (VTML) jekel ter predvsem s stališča ekonomičnosti je izvedba zvara z manjšo napetostjo tečenja oziroma z "mehkimi" korenskimi sloji (uporaba elektrod z manjšo napetostjo tečenja) zaželena, če lahko dosežemo veliko žilavost zvara, ki ne bo ogrožala varnega obratovanja zvarjenih konstrukcij. V diplomskem delu sem preučeval lomne lastnosti večvarkovnega z manjšo trdnostjo X zvarnega spoja z mehkim korenskim slojem in brez njega. Zvarni spoj je varjen na VTML-jeklu (debeline 30 mm) Niomol 490 in v zaščiteni atmosferi plina (80 % Ar + 20 % CO2). V primeru X-zvarnega spoja z mehkim korenskim slojem je opazen vpliv mehkega korenskega sloja z najmanjšo trdnostjo na lomno žilavost CTOD celotnega zvarnega spoja, ki se je odražal na začetku krhkega loma v področju zvara z najmanjšo trdnostjo. Namen raziskave je ugotoviti, ali je izbrana tehnologija varjenja za trdnostno manjši zvarni spoj z mehkim korenskim slojem priporočljiva oziroma uporabna za izboljšanje varivosti VTML-jekla Niomol 490 glede na doseženo lomno žilavost zvara oziroma mehkega korenskega sloja.
Keywords:
Trdnostna neenakost
,
manjša trdnost zvara
,
"mehki" korenski sloj
,
lomna žilavost
,
CTOD-preizkus
,
lokalno krhka področja (LKP).
Place of publishing:
Krško
Publisher:
[B. Vizlar]
Year of publishing:
2012
PID:
20.500.12556/DKUM-38273
UDC:
621.791.053:620.179.2(043.2)
COBISS.SI-ID:
1024105820
NUK URN:
URN:SI:UM:DK:J2JXQWBV
Publication date in DKUM:
08.11.2012
Views:
2853
Downloads:
231
Metadata:
Categories:
FE
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:
VIZLAR, Boštjan, 2012,
LOMNA ŽILAVOST VISOKOTRDNOSTNIH ZVARNIH SPOJEV
[online]. Bachelor’s thesis. Krško : B. Vizlar. [Accessed 20 January 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=38273
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Secondary language
Language:
English
Title:
FRACTURE TOUGHNESS OF HSLA STEEL WELDS
Abstract:
In welds of quenched and tempered (Q + T) high strength low alloyed steels (HSLA) weld strength under matching can be used to satisfy the toughness requirements for the weld deposit. Cost of reduced pre-heating of these steels can be saved if one can prove that use of soft electrodes for root passes do not endanger the overall quality of the joint. The present work deals with the determination of Charpy impact toughness and CTOD fracture toughness of under matched X-grooved multy pass weld joints with soft and without soft root layer mode on HSLA steel (300 mm thick) grade HT 80. CTOD values were clearly influenced by the softer material in the root layer. The metallographical post-test sectioning has revealed the initiation points (LBZs) mainly at the lowest weld metal strength. The aim of this experimental work is to establish the fracture behavior of HLSA multy-pass mismatched welds and to determine the effect of local strength mismatch on fracture toughness and finally to prove that the welding procedure for the weld joint with a soft root layer improves the weld ability of commercial HLSA steel.
Keywords:
Strength mismatching
,
under matched welds
,
soft root layer
,
fracture toughness
,
CTOD test
,
local brittle zones (LBZ).
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