Improvement of RS requirements for the cold cracks resistance in welded joints of ship hull high-strength steel structures

Improvement of RS requirements for the cold cracks resistance in welded joints of ship hull high-strength steel structures

Authors: M.A. Ivanov, A.K. Tingaev, I.A. Ilyin

The paper presents a brief analysis of the numerical and experimental methods for assessing the resistance to the cold cracks formation in metal welded joints, their positive qualities and disadvantages in relation to welded joints of ship hull structures of economically alloyed high strength steel grades of the new generation. It is justified that the experimental methods are necessary to assess the resistance to cold cracks. The choice of the test type (Tekken Test) is also justified. To improve the detection of cold cracks and to reduce the probability of failure in welded joints at the stage of operation, it is proposed to introduce a duplicate nondestructive testing of welded joints, recognized as fit by the results of the primary control. The results of the experimental studies are presented. Based on the results obtained, improvements to the RS requirements are proposed.

 

Keywords: cold cracks, high strength steel, hydrogen diffusion, residual stresses, Tekken test.

 

UDC 621.791

About authors:

M.A. Ivanov - PhD, associate professor, South Ural State University, Chelyabinsk, e-mail: IvanovMA@susu.ru

A.K. Tingaev - PhD, associate professor, South Ural State University, Chelyabinsk

I.A. Ilyin - South Ural State University, Chelyabinsk

Pages: 64-77

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For citation: M.A. Ivanov, A.K. Tingaev, I.A. Ilyin. Improvement of RS requirements for the cold cracks resistance in welded joints of ship hull high-strength steel structures. Research Bulletin by Russian Maritime Register of Shipping. 2019, No. 54/55, pp. 64-77.