Improving Fatigue Strength of Welded Joints by Hammer Peening and Tig-Dressing

Anami, Kengo; Miki, Chitoshi; Tani, Hideki; Yamamoto, Haruhito

doi:10.2208/jscej.2000.647_67

Cited by 25 publications

(9 citation statements)

References 15 publications

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“…For new structures, the fatigue strength enhancement via HFMI treatment is usually greater than that typically achieved using TIG remelting [20], [34], particularly in high-cycle fatigue regimes. This is also expected to be the case if these two methods are used on crack-free pre-fatigued structures.…”

Section: Discussionmentioning

confidence: 99%

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

2021

Stahlbau

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Different post-weld treatment methods have been developed to enhance the fatigue strength of welded steel structures and extend the service lives of their components. High-frequency mechanical impact (HFMI) treatment and tungsten inert gas (TIG) remelting are two methods that have attracted considerable interest in recent decades. This paper presents the results of a study of fatigue life extension for pre-fatigued welded steel details which can be achieved using HFMI treatment and TIG remelting. More than 250 fatigue test results were collectedincluding different details such as butt welds, longitudinal attachments, transverse attachments and cover plate attachments. HFMI treatment was found to extend the life considerably when the specimens treated were free from cracks or when existing cracks were < 2.25 mm deep. TIG remelting could extend fatigue lives even with cracks > 4 mm deep. In comparison to TIG remelting, HFMI treatment results in a longer fatigue life extension for pre-fatigued details, provided existing cracks are < 2.25 mm deep. Regarding TIG remelting, the depth of possible remaining cracks was found to be a substantial parameter when assessing the degree of life extension.

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Section: Discussionmentioning

confidence: 99%

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

2021

Stahlbau

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“…Weld toe grinding 1) and TIG-dressing 2) can improve weld geometry and reduce stress concentration. To reduce structural stress concentration, smoothing the stress state by drilling hole near the weld is often applied.…”

Section: Intoroductionmentioning

confidence: 99%

“…Shot peening 4), 5) and Hammer peening 2) are well-established techniques to induce residual compressive stress at weld toe. Ultrasonic Impact Treatment (UIT) can also induce residual compressive stress at weld toe 6) .…”

Section: Intoroductionmentioning

confidence: 99%

Extending Fatigue Life of Cracked Out-of-Plane Gusset by Icr Treatment

Ishikawa

Yamada

Kakiichi

et al. 2011

Structural Eng./Earthquake Eng.

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(Former student of Nagoya University) (7-3-1 Hongo, Japan) Various types of fatigue cracks have been found in steel bridges. To maintain steel bridges, repair and retrofit methods of such fatigue cracks have been developed. The authors developed a technique which generates plastic deformation of steel surface near the crack in order to close crack opening by an impact air tool. This method is called Impact Crack Closure Retrofit treatment (ICR treatment). Plate bending fatigue tests of out-of-plane gusset specimens were carried out. Fatigue cracks at turn-around welds and those which have propagated 10 and 20 mm were ICR-treated. Fatigue test results showed significant improvement in the fatigue life of specimens due to ICR treatment.

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“…Fu 3) studied the grinding treatment effect on rib-to-roof weld fatigue performance of steel bridge decks and the grinding gouge sizes were proposed. Anami 4) investigated the TIGdressing and hammer peening methods using out-of-plane gusset joints and the mechanism of each improvement was discussed with respect to stress concentration and residual stress at the weld toe. Previous studies showed that grinding, hammer peening, UIT and TIG dressing are methods that can efficiently increase the fatigue life of welded joints.…”

Section: Introductionmentioning

confidence: 99%