scholarly journals Influence of welding materials on fatigue strength of fillet welded joints made from high strength steel.

1996 ◽  
pp. 133-140 ◽  
Author(s):  
Kazuo Tateishi ◽  
Kab-Soo Kyung ◽  
Fumitaka Machida ◽  
Chitoshi Miki
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steel ◽  
High Strength ◽  
Welding Materials

Fatigue Strength Assessment for High Strength Steel Welded Joints

2010 ◽  
Author(s):  
Ho Jung Kim ◽  
Sung Won Kang ◽  
Jae Myung Lee ◽  
Myung Hyun Kim
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steel ◽  
Fatigue Behavior ◽  
High Strength ◽  
Fatigue Tests ◽  
Cold Metal Transfer ◽  
Strength Assessment ◽  
Back Plate ◽  
Cold Metal

The aim of the present paper is to investigate and to compare the fatigue characteristics of butt welded joints made of high strength steel with tensile strength 700MPa. The influence of different back plate materials and the groove shapes of copper backing are investigated. Various backing methods have been used in the steel construction industries, but steel backing, which is the most frequently used, sometimes is not capable of providing sufficient fatigue strengths for welded joint, particularly for high strength steel. Therefore, alternative backing methods have been investigated in order to improve the fatigue strength by employing ceramic backing, CMT (Cold Metal Transfer) [1] and copper backing. The main objective of the work is to estimate the fatigue test results for improving fatigue strength by comparing different backing materials and groove shapes. A series of fatigue tests with different types of backings has been carried out to obtain the fatigue life of butt welded joints. It was observed that the fatigue behavior of welded joints can be substantially improved by changing back bead shapes. The result has shown that the back bead shape of copper backing is better than others except for that of CMT, accompanied by improved fatigue strength.

scholarly journals Improvement of Fatigue Strength of High Strength Steel Welded Joints by Applying Undermaching Weld Materials.

1997 ◽  
pp. 97-106 ◽  
Author(s):  
Kab Soo Kyung ◽  
Takeshi Mori ◽  
Chitoshi Miki ◽  
Tsuyosi Tachibana
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steel ◽  
High Strength

510 Fatigue Strength and Fracture Mechanism on Spot Welded Joints of Ultra-High Strength Steel

2006 ◽  
Vol 2006.55 (0) ◽  
pp. 209-210
Author(s):  
Ryo ADOMI ◽  
Makoto OHSUKA ◽  
Keiichiro TOHGO ◽  
Hiroyasu ARAKI ◽  
Yoshinobu SHIMAMURA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Fracture Mechanism ◽  
High Strength Steel ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
Spot Welded

Sub-Zero Temperature Fatigue Strength of Butt-Welded Normal and High-Strength Steel Joints for Ships and Offshore Structures in Arctic Regions

2020 ◽  
Author(s):  
Moritz Braun ◽  
Aleksandar-Saša Milaković ◽  
Sören Ehlers ◽  
Adrian Kahl ◽  
Tom Willems ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Fatigue Strength ◽  
Welded Joints ◽  
High Strength Steel ◽  
Material Selection ◽  
High Strength ◽  
Offshore Structures ◽  
International Standards ◽  
Effect Of Temperature ◽  
Selection For

Abstract Ships and offshore structures operating in Artic regions face specific challenges such as ice loads and seasonal low temperatures. In order to meet these extreme environmental requirements, the effect of temperature on material behaviour needs to be considered. It is well known that static material properties (yield strength, fracture toughness etc.) undergo significant changes with temperature. In recent studies, significantly higher fatigue strength was observed in welded joints in comparison to estimates based on international standards. Fatigue strength increased even for temperatures far below the allowed service temperature based on fracture toughness results; however, studies on fatigue strength of structural steel at sub-zero temperatures are scarce. Moreover, material selection for ships and offshore structures is usually based on empirical Charpy and fracture toughness relations at the design temperature, minus a safety margin. This study aims at introducing an S-N curve database for welded joints that can be used to verify the fatigue design approaches for ships and offshore structures subject to sub-zero temperatures. Therefore, the effect of temperature on the fatigue strength of butt-welded normal and high strength steel structures is analysed experimentally for sub-zero temperatures. For this purpose, fatigue test results of SAW and MAG welded joints for temperatures down to −50 °C are analysed and the potential for changes regarding material selection for ships and offshore structures are discussed.

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