High-frequency mechanical forging of welded joints in metal structures

Kir'yan, V. I.; Knysh, V. V.

doi:10.1080/09507110903464861

Welding International

2010

DOI: 10.1080/09507110903464861

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High-frequency mechanical forging of welded joints in metal structures

V. I. Kir'yan

V. V. Knysh

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2014

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“…As regards the other factors affecting the fatigue resistance of welded joints strengthened after HFMP, the influence of stress concentration factor accounts for only 14% of the total [13]. As to the influence of residual stresses, it can be pointed out that the conditions of fatigue tests of welded specimens, which have been carried out earlier [4], indicate their almost complete relaxation during the first several thousands of loading cycles.…”

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Effect of High-Frequency Mechanical Peening Conditions on Increase in the Fatigue Resistance of Butt-Welded Joints

Degtyarev

Gopkalo

2014

Strength Mater

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A procedure is proposed for the determination of the endurance limit of butt-welded joints of low-carbon steels under different high-frequency mechanical peening conditions from the maximum depth value of plastically deformed layer using experimental microhardness measurement data.Keywords: endurance limit, groove depth, high-frequency mechanical peening velocity, depth of plastically deformed layer, welded joint, microhardness.Introduction. At the present stage of development of technological methods of increasing the fatigue resistance of welded metallic structures and extending their service life, much attention is given to high-frequence mechanical peening (HFMP) [1]. This is due to the fact that HFMP can provide the maximal improvement of the fatigue resistance of products and increase in their life [2,3], at low climatic temperatures as well. However, the large-scale introduction of HFMP is limited by the absence of the reliable control criterion of its efficiency, insofar as the criterion now in use, which is based on the velocity of working tool movement along the weld, which is 0.5 m/min [2], does not ensure the required increase in fatigue resistance and treatment efficiency control both in the manufacture of welded metallic structures and in repair and restoration works.In [4] it was proposed to use as a HFMP efficiency criterion the depth of the groove formed after the peening of the zone of fusion of weld and base metal. The optimal depth value was determined to be 0.14 mm, and HFMP velocity parameters as a function of working tool vibration amplitude were proposed. However, the effect of different treatment conditions on the fatigue resistance of welded joints remains unstudied up to now. Since carrying out a series of full-scale experimental investigations is a rather expensive and long-term procedure, which involves high material consumption, the computational estimation of the fatigue resistance of butt-welded joints appears to be the most reasonable solution of the problem in comparison with individual experimental data.The purpose of this work is to computationally assess the effect of HFMP conditions on increase in the endurance limit of butt-welded joints from the results of microhardness measurement at the different depth of plastically deformed layer.Equipment, Materials, and Test Procedure. The object of investigations was a butt-welded joint of St. 3sp plate steel, which was made by semiautomatic carbon dioxide shielded welding. The test specimens were prepared at several stages.At the first stage, a previously butt-welded plate (Fig. 1a) was cut into 40 400 14´mm specimens with a transverse weld. This allowed us to greatly reduce the residual stresses occurring after welding the plate.At the second stage, specimens were subjected to HFMP along the line of fusion of weld and base metal (Fig. 1b) with a USP-300 ultrasonic tool [6] with a vibration frequency of 22 kHz, whose deforming mechanism was a four-striker head with built-in rods 3 mm in diameter. Specimens were treated along the fus...

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confidence: 96%

Effect of High-Frequency Mechanical Peening Conditions on Increase in the Fatigue Resistance of Butt-Welded Joints

Degtyarev

Gopkalo

2014

Strength Mater

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High-frequency mechanical forging of welded joints in metal structures

Cited by 1 publication

References 2 publications

Effect of High-Frequency Mechanical Peening Conditions on Increase in the Fatigue Resistance of Butt-Welded Joints

Effect of High-Frequency Mechanical Peening Conditions on Increase in the Fatigue Resistance of Butt-Welded Joints

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