Thermal Behavior of an HSLA Steel and the Impact in Phase Transformation: Submerged Arc Welding (SAW) Process Approach to Pipelines

2016 ◽  
pp. 85-98
Author(s):  
P. S. Costa ◽  
F. A. Reyes-Valdés ◽  
R. Saldaña-Garcés ◽  
E. R. Delgado ◽  
A. Salinas-Rodrı́guez
Keyword(s):  
Phase Transformation ◽  
Thermal Behavior ◽  
Arc Welding ◽  
Hsla Steel ◽  
Submerged Arc Welding ◽  
Process Approach ◽  
The Impact ◽  
Submerged Arc

SUBMERGED ARC WELDING TECHNOLOGY

2021 ◽  
Author(s):  
Кирилл Витальевич Буров ◽  
Анастасия Вячеславовна Полякова
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Electric Arc ◽  
Welding Technology ◽  
Electric Arc Welding ◽  
And Performance ◽  
The Impact ◽  
Submerged Arc

В данной статье раскрываются особенности применения флюса в технологии электродуговой сварки и влияние на характеристики и работоспособность сварных соединений. This article describes the features of the use of flux in the technology of electric arc welding and the impact on the characteristics and performance of welded joints.

Effect of Flux Constituents and Basicity Index on Mechanical Properties and Microstructural Evolution of Submerged Arc Welded High Strength Low Alloy Steel

2013 ◽  
Vol 738-739 ◽  
pp. 242-246 ◽  
Author(s):  
Sandeep Jindal ◽  
Rahul Chhibber ◽  
N.P. Mehta
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Arc Welding ◽  
Hsla Steel ◽  
High Strength ◽  
Submerged Arc Welding ◽  
Strength Increase ◽  
Increase With Increase ◽  
Basicity Index ◽  
Submerged Arc

The application of high strength low alloy (HSLA) steels has been limited by unavailability of suitable joining and filler metals in submerged arc welding (SAW) processes. The present work aims at the design and development of flux for Submerged Arc Welding of HSLA steel. In the work L8 array of Taguchi Design is used to formulate eight types of fluxes to vary basicity index (BI) from 1.26 to 2.81 and to study the effect of flux constituents and basicity index on tensile strength, microhardness and microstructure of the weld metal. Empirical models for ultimate tensile strength and microhardness at the centre of weld versus flux constituents and basicity index have been developed. From the experiments it is found that ultimate tensile strength increase with increase of basicity index with minimum at 1.26 increases upto 2.33 and then further decreases whereas opposite in case of microhardness which is highest at 1.26 and minimum at 1.9. Increase of CaO in the flux increases ultimate tensile strength but microhardness remains unaffected whereas increase of SiO2 decreases ultimate tensile strength but microhardness remains constant. Microhardness decreases critically with increase of CaF2.

Influence of Welding Parameters on Weld Appearance and Mechanical Properties in Twin-Wire Tandem Submerged Arc Welding of HSLA Steel

2013 ◽  
Vol 753-755 ◽  
pp. 358-362 ◽  
Author(s):  
Chun Yan Yan ◽  
Jian Cheng Huang ◽  
Lin Wang ◽  
Di Zhu ◽  
Shun Zhen Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welding Speed ◽  
Arc Welding ◽  
Hsla Steel ◽  
Submerged Arc Welding ◽  
Weld Bead ◽  
Welding Parameters ◽  
Weld Appearance ◽  
Submerged Arc ◽  
Tandem Submerged Arc Welding

Effects of welding parameters on the weld bead appearance and mechanical properties in twin-wire tandem submerged arc welding of a high-strength low-alloy steel were investigated. Steel plates were welded using different combinations of welding current, voltage, inter-wire spacing and welding speed. The weld joints were characterized in detail by metallography. Hardness and tensile properties of the specimens were measured. The experimental analysis reveals that good weld appearance can be obtained for a range of inter-wire spacing from 55mm to 80mm. Leading wire current, trailing wire voltage and welding speed are the major factors affecting weld bead profile and microstructures in weld metal and fusion zone. Greater welding speed tends to produce higher cooling rate and favors the formation of strengthening phases like acicular ferrite and bainitic structures resulting in better mechanical properties.

scholarly journals Effect of Mg Addition on the Microstructure and Properties of a Heat-Affected Zone in Submerged Arc Welding of an Al-Killed Low Carbon Steel

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2445
Author(s):  
Yandong Li ◽  
Weiwei Xing ◽  
Xiaobing Li ◽  
Bo Chen ◽  
Yingche Ma ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Coarse Grained ◽  
Weak Zone ◽  
Microstructure And Properties ◽  
Mg Addition ◽  
The Impact ◽  
Submerged Arc

To reveal the effect of Mg treatment on the microstructure evolution behavior in the actual steel welding process, the microstructure and properties of Al-deoxidized high-strength ship plate steel with Mg addition were analyzed after double-side submerged arc welding. It was found that the Al–Mg–O + MnS inclusion formed under 26 ppm Mg treatment could promote acicular ferrite (AF) nucleation in the coarse-grained heat-affected zone (CGHAZ) and inhibit the formation of widmanstätten ferrite and coarse grain boundary ferrite. In the fine-grained heat-affected zone (FGHAZ) and intercritical heat-affected zone (ICHAZ), polygonal ferrite and pearlite were dominant. Al–Mg–O+MnS cannot play a role in inducing AF, but the grain size of ferrite was refined by Mg addition. The impact toughness in HAZ of the Mg-added steel was higher than that of Mg-free steel. With the heat-input rising from 29.55 to 44.11 kJ/cm, it remained relatively stable in Mg-treated steel. From the fusion line to the base metal, the micro-hardness of the fusion zone, CGHAZ, ICHAZ and FGHAZ decreased to some extent after Mg addition, which means the cold cracking tendency in the welding weak zone could be reduced. Finally, the mechanisms of Mg-containing inclusion-induced AF were also systematically discussed.

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