Print

The Paton Welding Journal 2013

The Paton Welding Journal ¹07 2013

2013 ¹07 (01) 2013 ¹07 (03)


TPWJ, 2013, #7, 7-12 pages

FORMATION OF COLD CRACKS IN WELDED JOINTS FROM HIGH-STRENGTH STEELS WITH 350-850 MPa YIELD STRENGTH
 
Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       ¹ 7, 2013 (July)
Pages                       7-12


Authors
L.M. LOBANOV, V.D. POZNYAKOV and O.V. MAKHNENKO
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua


Abstract
The main problems in welding of high-strength steels are connected with their susceptibility to cold crack formation. As a rule such cracks are nucleated in HAZ of welded joints under the effect of tensile stresses. Diffusible hydrogen and presence of hardening structures in metal accelerate this process. Given paper presents a comparative analysis of effect of structure, diffusible hydrogen and residual stresses on cold crack resistance of welded joints from high-strength structural steels differ in chemical composition and level of static strength. Experiment-calculation methods of investigation were used for study of microstructural changes and formation of stress-strain state in rigidly fixed welded joints. Resistance of welded joints to cold crack formation was evaluated based on results of testing of technological samples and specimens on Implant method. It was determined as a result of performed investigations that probability of formation of longitudinal cold cracks in rigidly fixed welded joints from high-strength steel changes in wide ranges. However, there are specific regularities related with effect of the residual welding stresses on this processes. Increase of diffusible hydrogen content in deposited metal, steel carbon equivalent, cooling rate and stress-strain state of welded joints reduce their cold crack resistance. Results of performed investigations can be used in development of technological processes of welding of high-strength steels with yield strength from 350 to 850MPa and carbon equivalent from 0.35 to 0.70%. 11 Ref., 4 Tables, 6 Figures.


Keywords: high strength low-alloy steels, welded joints, cold cracks, residual welding stresses, diffusible hydrogen, metal structure, preheating, heat-affected zone


Received:                30.05.13
Published:                28.07.13


References
1. Makarov, E.L. (1981) Cold cracks in welding of alloy steels. Moscow: Mashinostroenie.
2. Musiyachenko, V.F. (1983) Weldability and technology of welding of high-strength steels. Kiev: Naukova Dumka.
3. Hrivnak, I. (1984) Weldability of steels. Moscow: Mashinostroenie.
4. (1998) Welding handbook. Vol. 4: Materials and applications. Pt 2. Miami: AWS.
5. Magudeeswaran, G., Balasubramanian, V., Madhusudhan Raddy, G. (2009) Cold cracking of flux cored arc welded high strength steel weldments. J. Mat. Sci. and Technol., 25(4), 516-526.
6. Pokhodnya, I.K., Shvachko, V.I. (1997) Physical nature of hydrogen induced cold cracks in welded joints of structural steels. Avtomatich. Svarka, 5, 3-10.
7. Cwiek, J. (2007) Hydrogen degradation of high strength weldable steels. J. Achievements in Materials and Manufacturing Eng., 20, 223-226.
8. Makhnenko, V.I. (1998) Computater modeling of welding processes. In: Current materials science of 21st century. Kiev: Naukova Dumka.
9. Sayffarth, P., Kasatkin, O.G. (1982) Calculation of structural transformations in the welding processes. IIW Doc. IX-1288-82.
10. Makhnenko, V.I. (2006) Resource of safety service of welded joints and assemblies of current structures. Kiev: Naukova Dumka.
11. Lobanov, L.M., Mikhoduj, L.I., Vasiliev, V.G. et al. (1999) Peculiarities of running of thermodeformation processes in arc welding of high-strength steels. Avtomatich. Svarka, 3, 3-11.

News

2017.11.02 International conference «Titanium 2018: Production and application in Ukraine»
Starting from 12.01.2017, you can download PDF files of journals for the year 2015!
2016.11.16 International Conferensce «Welding and related technologies - present and future», 5-6 december, 2018, Kiev, Ukraine (The First Call for Papers)
2016.08.06 New book: Pogrebisky D. Welding of Metals: Classification, Brief History, Development

The most recent issues of journals on the site

Avtomaticheskaya Svarka ¹11 (2017), Paton Welding Journal ¹10 (2017), Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol ¹2 (2017), Sovremennaya Elektrometallurgiya ¹2 (2017).


  Official Facebook Page facebook_logo

IP: 54.161.3.96