Brittle crack-arrest fracture toughness in a high heat-input thick steel weld

2013 ◽  
Vol 185 (1-2) ◽  
pp. 179-185 ◽  
Author(s):  
Gyu Baek An ◽  
Wanchuck Woo ◽  
Jeong-Ung Park
Keyword(s):  
Fracture Toughness ◽  
Heat Input ◽  
Crack Arrest ◽  
High Heat ◽  
Steel Weld ◽  
Brittle Crack ◽  
High Heat Input ◽  
Thick Steel

Comparison of crack-arrest fracture toughness between low and high heat-input thick weld specimens

2015 ◽  
Vol 194 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Gyu Baek An ◽  
Wanchuck Woo ◽  
Jeong Ung Park ◽  
Vyacheslav Em
Keyword(s):  
Fracture Toughness ◽  
Heat Input ◽  
Crack Arrest ◽  
High Heat ◽  
High Heat Input

Development of Welding Materials for High Heat Input Welding Compatible with Thick Steel Plates of 460 MPa Yield Point Class for Very Large Container Ships

2010 ◽  
Vol 54 (1-2) ◽  
pp. R35-R41 ◽  
Author(s):  
Yuuji Hashiba ◽  
Kiyohito Sasaki ◽  
Tadashi Kasuya ◽  
Takehiro Inoue ◽  
Yuuji Funatsu
Keyword(s):  
Yield Point ◽  
Heat Input ◽  
High Heat ◽  
Steel Plates ◽  
High Heat Input ◽  
Thick Steel ◽  
Large Container ◽  
Point Class ◽  
Welding Materials

Structural Integrity Assessments by Measuring of Residual Stresses and Brittle Crack Toughness: A Thick Large-Scale Welding Study

2015 ◽  
Vol 750 ◽  
pp. 279-284
Author(s):  
Wan Chuck Woo
Keyword(s):  
Brittle Fracture ◽  
Residual Stresses ◽  
Heat Input ◽  
Fracture Behavior ◽  
Large Scale ◽  
High Heat ◽  
Propagation Path ◽  
Brittle Crack ◽  
Flux Cored Arc Welding ◽  
High Heat Input

Residual stresses inherently occur in welds and through-thickness distributions in an extra thick weld is unclear to date, though it is important in various steel, plant, and shipbuilding industries. Here introduce a recent complementary technique to determine residual stress measurement methods. Spatial variations of residual stresses were determined through the thickness of 70-mm thick ferritic steel welds created using low heat-input (1.7 kJ/mm) one-pass electro-gas welding (EGW) and high heat-input (56 kJ/mm) multi-pass flux-cored arc welding (FCAW). The results show that significant tensile stresses (about 90% of yield strength) occur along the weld centerline near the top surface (within 10% of the depth) in the FCAW specimen. Meanwhile, in the EGW weld, the peak stress moved towards the heat-affected zone at a depth of about 40% of the thickness due to the high heat-input. Secondly, large-scale (1 x 1 m) brittle fracture experiments have been performed to examine the brittle crack-arrest toughness and crack propagation path in each case. The fracture behavior compares to the observations of the grain size, hardness, and Charpy impact energy of the localized crack region in each weld. This study provides an insight in terms of the relevance between residual stresses and the brittle fracture behavior.

Effects of oxygen content on microstructure and impact toughness of high heat input flux-cored wire weld metals

2018 ◽  
Vol 115 (4) ◽  
pp. 410
Author(s):  
Fengyu Song ◽  
Yanmei Li ◽  
Ping Wang ◽  
Fuxian Zhu
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Weld Metal ◽  
Oxygen Content ◽  
Heat Input ◽  
High Heat ◽  
Cored Wire ◽  
Weld Metals ◽  
High Heat Input ◽  
The Impact

Three weld metals with different oxygen contents were developed. The influence of oxygen contents on the microstructure and impact toughness of weld metal was investigated through high heat input welding tests. The results showed that a large number of fine inclusions were formed and distributed randomly in the weld metal with oxygen content of 500 ppm under the heat input condition of 341 kJ/cm. Substantial cross interlocked acicular ferritic grains were induced to generate in the vicinity of the inclusions, primarily leading to the high impact toughness at low temperature for the weld metal. With the increase of oxygen content, the number of fine inclusions distributed in the weld metal increased and the grain size of intragranular acicular ferrites decreased, which enhanced the impact toughness of the weld metal. Nevertheless, a further increase of oxygen content would contribute to a great diminution of the austenitic grain size. Following that the fraction of grain boundary and the start temperature of transformation increased, which facilitated the abundant formation of pro-eutectoid ferrites and resulted in a deteriorative impact toughness of the weld metal.

Low Heat Input Welding for Thin Steel Fabrication

2006 ◽  
Vol 22 (02) ◽  
pp. 105-109
Author(s):  
S.M. Kelly ◽  
R.P. Martukanitz ◽  
P. Michaleris ◽  
M. Bugarewicz ◽  
T. D. Huang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Heat Input ◽  
Arc Welding ◽  
Process Development ◽  
High Heat ◽  
Hybrid Laser Arc Welding ◽  
Thin Steel ◽  
High Heat Input ◽  
Time Distortion ◽  
Buckling Distortion

As thinner members are used in marine construction, the use of conventional joining techniques results in significant angular and buckling distortion due to the inherent high heat input with these processes. Several low heat input alternatives, including laser beam, gas metal arc, and hybrid laser arc welding, are explored. The paper focuses on process development, real time distortion measurements, and implementation of these processes.

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