scholarly journals Development of low temperature use steel for large heat input welding.

1985 ◽  
Vol 24 (6) ◽  
pp. 521-523
Author(s):  
Y. Ohno ◽  
Y. Okamura ◽  
K. Uchino ◽  
S. Matsuda ◽  
K. Ikeda ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Input ◽  
Large Heat

scholarly journals Development of New Steel Plate with High Crack-Arrestability for Large-Heat-Input Welding and Low Temperature Services, and its Application for LPG Tankers.

Materia Japan ◽  
1995 ◽  
Vol 34 (6) ◽  
pp. 795-797
Author(s):  
Tadashi Ishikawa ◽  
Shigeru Oshita ◽  
Hidesato Mabuchi ◽  
Hiroshi Yajima ◽  
Daisuke Sakai
Keyword(s):  
Low Temperature ◽  
Heat Input ◽  
Steel Plate ◽  
Large Heat ◽  
High Crack

scholarly journals Development of YP390 MPa Grade Steel Plate with Superior Low Temperature Toughness for Large Heat Input Welding

Materia Japan ◽  
2014 ◽  
Vol 53 (1) ◽  
pp. 26-28
Author(s):  
Koichi Nakashima ◽  
Kazukuni Hase ◽  
Shigeru Endo ◽  
Taiki Eto ◽  
Hideaki Fukai
Keyword(s):  
Low Temperature ◽  
Heat Input ◽  
Steel Plate ◽  
Large Heat ◽  
Low Temperature Toughness ◽  
Grade Steel

Effect of Welding Processes with High Heat Input on the Microstructure and Toughness of Coarse-Grained Heat-Affected Zone of a High-Strength High-Toughness Steel

2018 ◽  
Vol 937 ◽  
pp. 61-67
Author(s):  
Yu Jie Li ◽  
Jin Wei Lei ◽  
Xuan Wei Lei ◽  
Oleksandr Hress ◽  
Kai Ming Wu
Keyword(s):  
Low Temperature ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
High Strength ◽  
High Heat ◽  
Coarse Grained ◽  
Low Temperature Impact Toughness ◽  
The Impact ◽  
Welding Processes

Utilizing submerged arc welding under heat input 50 kJ/cm on 60 mm thick marine engineering structure plate F550, the effect of preheating and post welding heat treatment on the microstructure and impact toughness of coarse-grained heat-affected zone (CGHAZ) has been investigated. The original microstructure of the steel plate is tempered martensite. The yield and tensile strength is 610 and 660 MPa, respectively. The impact absorbed energy at low temperature (-60 °C) at transverse direction reaches about 230~270 J. Welding results show that the preheating at 100 °C did not have obvious influence on the microstructure and toughness; whereas the tempering at 600 °C for 2.5 h after welding could significantly reduce the amount of M-A components in the coarse-grained heat-affected zone and thus improved the low temperature impact toughness.

scholarly journals Characteristics of HAZ Microstructure in Ti-B Treated Steel for Large Heat Input Welding

1987 ◽  
Vol 73 (8) ◽  
pp. 1010-1017 ◽  
Author(s):  
Yasuhide OHNO ◽  
Yoshihiro OKAMURA ◽  
Shoichi MATSUDA ◽  
Koichi YAMAMOTO ◽  
Toshio MUKAI
Keyword(s):  
Heat Input ◽  
Treated Steel ◽  
Large Heat

Effects of Zirconium on Impact Toughness for the Hull Structure Steel Plate

2014 ◽  
Vol 644-650 ◽  
pp. 4932-4935
Author(s):  
Tie Li Qi
Keyword(s):  
Impact Toughness ◽  
Impact Energy ◽  
Heat Input ◽  
Steel Plate ◽  
Sharp Decline ◽  
Large Size ◽  
Welding Heat Input ◽  
Hull Structure ◽  
Large Heat ◽  
The Impact

The Gleeble3500 combined with SEM, TEM and other experimental methods are employed in this paper to investigate the effects of zirconium content on impact toughness of heat affected zone (HAZ) of hull structure steel plate during the large heat input welding. The results showed when 0.01% zirconium were added in the steel, the impact energy reached 224 J at-60°C experienced 150 kJ/cm welding heat input. But the large-size rectangular inclusions are found in CGHAZ when 0.02% zirconium were added in the steel, the impact energy fell to 38 J at-60°C experienced 150 kJ/cm welding heat input, the large-size inclusions, especially rectangular inclusion, were the main cause for the sharp decline of low temperature toughness after welding.

scholarly journals Microstructure features and formation mechanism in a newly developed electroslag welding

2021 ◽  
Author(s):  
Tomonori Kakizaki ◽  
Shodai Koga ◽  
Hajime Yamamoto ◽  
Yoshiki Mikami ◽  
Kazuhiro Ito ◽  
...  
Keyword(s):  
Low Temperature ◽  
Weld Metal ◽  
Heat Input ◽  
Acicular Ferrite ◽  
Charpy Impact ◽  
Electroslag Welding ◽  
Weld Metals ◽  
Columnar Grains ◽  
Cooling Speed ◽  
Low Temperature Toughness

AbstractElectroslag welding (ESW) is known to show higher heat input than electrogas welding (EGW), resulting in poor low-temperature toughness. However, a newly developed ESW (dev. ESW) method using low-resistivity slag bath exhibited excellent low-temperature toughness as a result of lower effective heat input than conventional EGW, as demonstrated by the faster cooling rates measured in weld metals and estimated using finite element method analyses. This led to much shallower molten pool in the dev. ESW, resulting in much finer columnar grains and thinner centerline axial grains. High cooling speed in the dev. ESW method appeared to contribute to increased acicular ferrite proportion. The uniform microstructure with large acicular ferrite proportion and small number of inclusions in the weld metal permitted the dev. ESW weld metal to possess little variation in Charpy impact energy across the center of weld metal.

Effect of Nb Content on the Impact Toughness of Coarse-Grained Heat-Affected Zone of Pipeline Steels under Large Heat Input

2014 ◽  
Vol 1078 ◽  
pp. 3-7
Author(s):  
Feng Zhou ◽  
Zhou Gao ◽  
Kai Ming Wu
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Optical Microscope ◽  
Coarse Grained ◽  
Electron Backscattered Diffraction ◽  
Pipeline Steels ◽  
Nb Content ◽  
Large Heat ◽  
Austenite Grains ◽  
The Impact

The effect of large heat inputs (200 kJ/cm) on the microstructures and toughness of heat-affected zone of Nb microalloyed X70 pipeline steels were simulated utilizing Gleeble-3800. The microstructures were observed by optical microscope, scanning electron microscope and electron backscattered diffraction technique. Results showed that when the large heat input welding was applied, big austenite grains and coarse microstructures were formed in the coarse-grained heat-affected zone, and thus the toughness of the coarse-grained heat-affected zone was seriously reduced. With the increase of Nb content, the toughness of the CGHAZ did not change remarkably under the large heat input welding.

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