Evaluation of local material strength property by small specimen – Application to strength prediction of spot-welded joint -

Spot welding of dissimilar materials can utilize the respective advantage comprehensively, of which reliable prediction of fatigue life is the key issue in the structure design and service process. Taking into account almost all the complex factors that have effects on the fatigue behavior such as load level, thickness, welding nugget diameter, vibrational frequency, and material properties, this article proposed an energy dissipation-based method that is able to predict the fatigue life for spot-welded dissimilar materials rapidly. In order to obtain the temperature gradient, the temperature variations of four-group spot-welded joint of SUS301 L-DLT stainless steel and Q235 carbon steel during high-cycle fatigue tests were monitored by thermal infrared scanner. Specifically, temperature variation disciplines of specimen surface were divided into four stages: temperature increase, temperature decrease, continuous steady increase in temperature, and ultimate drop after the fracture. The material constant C that a spot-welded joint of dissimilar material needs to reach fracture is 0.05425°C·mm3. When the specimen was applied higher than the fatigue limit, the highest error between experimental values and predicted values is 18.90%, and others are lower than 10%. Therefore, a good agreement was achieved in fatigue life prediction between the new method and the validation test results.

Download Full-text

Fatigue Strength of Spot Welded Joint

Transactions of the Iron and Steel Institute of Japan ◽

10.2355/isijinternational1966.9.388 ◽

1969 ◽

Vol 9 (5) ◽

pp. 388-398 ◽

Cited By ~ 2

Author(s):

Teruyuki UEDA ◽

Hidetoshi KAWATAKA

Keyword(s):

Fatigue Strength ◽

Welded Joint ◽

Spot Welded

Download Full-text

Effect of Strain Rate Variation on Fatigue Life of Spot Welded Joint

Key Engineering Materials - Advances in Fracture and Strength ◽

10.4028/0-87849-978-4.2447 ◽

2005 ◽

pp. 2447-2452

Author(s):

Joon Hyuk Song ◽

Hyu Sun Yu ◽

Hee Yong Kang ◽

Sung Mo Yang

Keyword(s):

Fatigue Life ◽

Strain Rate ◽

Welded Joint ◽

Rate Variation ◽

Spot Welded

Download Full-text

Local melting mechanism and its effects on mechanical properties of friction spot welded joint for Al-Zn-Mg-Cu alloy

Journal of Material Science and Technology ◽

10.1016/j.jmst.2017.11.014 ◽

2018 ◽

Vol 34 (1) ◽

pp. 185-191 ◽

Cited By ~ 6

Author(s):

Yunqiang Zhao ◽

Chungui Wang ◽

Jizhong Li ◽

Jinhong Tan ◽

Chunlin Dong

Keyword(s):

Mechanical Properties ◽

Welded Joint ◽

Local Melting ◽

Cu Alloy ◽

Melting Mechanism ◽

Spot Welded

Download Full-text

A Description of Local Material Properties Close to a Butt Weld

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.586.146 ◽

2013 ◽

Vol 586 ◽

pp. 146-149

Author(s):

Pavel Hutař ◽

Martin Ševčík ◽

Ralf Lach ◽

Zdeněk Knésl ◽

Luboš Náhlík ◽

...

Keyword(s):

Stress Intensity Factor ◽

Material Properties ◽

Radial Crack ◽

Welded Joint ◽

Butt Weld ◽

Pipe System ◽

Local Material ◽

Mechanics Analysis ◽

Welding Procedure ◽

Local Material Properties

The paper presents a methodology for the lifetime assessment of welded polymer pipes. A fracture mechanics analysis of a butt-welded joint is performed by simulating radial crack growth in the nonhomogenous region of the pipe weld. It was found that the presence of material nonhomogeneity in the pipe weld caused by the welding procedure leads to an increase in the stress intensity factor of the radial crack and changes the usual failure mode of the pipe system. This can lead to a significant reduction in the lifetime of the pipe system.

Download Full-text