Influence of shape of weld toe and hardness of weld metal on fatigue properties in GMA welded ﬁllet lap joint of UHSS sheet

Sawanishi, Chikaumi; Matsuda, Hiroshi; Tagawa, Tetsuya; Ikeda, Rinsei; Tsutsumi, Sadami

doi:10.1080/09507116.2021.1941631

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…In contrast, Gural et al [26] found that the maximum hardness values were within of the weld metal region. In the literature [11,20,[27][28][29], the variations in hardness observed in the welded parts can be attributed to several factors, mainly to residual stresses, grain size, phase composition and metallic inclusions in addition to carbon transfer during welding.…”

Section: Results and Di̇scussi̇onmentioning

confidence: 99%

Investigation on the Microstructure and Mechanical Properties of ASTM A131 Steel Manufactured by Different Welding Methods

Ata

Çalık

Uçar

2022

Advances in Materials Science

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Welding is an indispensable manufacturing process in the shipbuilding industry. The fierce competition involved often necessitates a cost-effective and reliable welding method. In this study, the weldabilities, microstructures and some mechanical properties of ASTM A131 (Grade A) steel joints fabrication by submerged arc welding (SAW), metal active gas (MAG) welding and plasma arc welding (PAW) have been investigated. The microstructures of the welds were examined by optical microscopy. The mechanical properties of the joints were determined by microhardness measurements, tensile and impact tests. The results showed that tensile strength of the joints reached a tensile strength of up to 462 MPa. The locations of the fractures were always adjacent to the base metal. The Charpy impact energy of the weld metal reached a value of 72.5 J, which was 25 % higher than that of the base metal at 57.7 J. A relatively high hardness of 221 HV was obtained in the PAW method compared to 179 HV in the base metal.

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Section: Results and Di̇scussi̇onmentioning

confidence: 99%

Investigation on the Microstructure and Mechanical Properties of ASTM A131 Steel Manufactured by Different Welding Methods

Ata

Çalık

Uçar

2022

Advances in Materials Science

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“…It is generally thought that the fatigue performance of welded joints is not significantly improved if the static tensile strength of the base metal is increased (2)～ (4) . Although the main cause is considered to be stress concentration due to the notch effect at the weld toe (5) (6) ,application of high strength steels to chassis parts has not expanded due to this problem.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Fatigue Life of Arc Welded T-joints by Local Shape Change Near the Joint Line

Tokita¹,

Yamaguchi²,

Shiozaki³

et al. 2022

IJAE

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The objective of this study is to improve fatigue life of T-shape arc welded joint structures which are often used in automobiles. In conventional T-shape joint, ST-joint (Standard T-joint), a vertical part is welded to a flat surface in the horizontal part. In this paper, a new structure, CCT-joint (Concave shape T-joint), is proposed which can reduce stresses around a joint line in car driving. In a CCT-joint, a vertical part is welded to a concave surface in the horizontal part. Fatigue life of a CCT-joint was significantly longer than that of a conventional ST-joint. Results of this study suggest that the drastic improvement in fatigue life was due to stress reduction by the concave shape around the joint line. FEM stress analysis revealed that the maximum stress near the weld line of CCT-joint was reduced to less than half that of the ST-joint. Furthermore, it was found that the locations of the maximum stress were different between the CCT-joint and the ST-joint. This suggests that the crack origin positions of both joints are different, which was also confirmed experimentally.The geometry, hardness, and residual stresses after welding were investigated around the weld toe. The effects of geometry and hardness were small on the fatigue life. The residual stresses were decreased by CCT-joint. The evaluation of the advantage of residual stress reduction by CCT-joint compared with that of stress reduction in car driving will be investigated and discussed in the next step of this study.

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Improvement of fatigue performance by applying tandem GMAW in lap joints with gaps

Kim

et al. 2023

Int J Adv Manuf Technol

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Influence of shape of weld toe and hardness of weld metal on fatigue properties in GMA welded ﬁllet lap joint of UHSS sheet

Cited by 3 publications

References 11 publications

Investigation on the Microstructure and Mechanical Properties of ASTM A131 Steel Manufactured by Different Welding Methods

Investigation on the Microstructure and Mechanical Properties of ASTM A131 Steel Manufactured by Different Welding Methods

Improvement of Fatigue Life of Arc Welded T-joints by Local Shape Change Near the Joint Line

Improvement of fatigue performance by applying tandem GMAW in lap joints with gaps

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