Study on arc and TIG welding of earthquake-resistant structural steels with a higher carbon equivalent

High strength rebars are generally developed by increasing carbon and manganese contents depending on the size and strength capacity requirement. These elements in steel beyond certain level adversely affect weldability and impact toughness which are very critical for structural steels. In this stud...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2022-03, Vol.119 (3-4), p.2553-2570
Main Authors: Rao, Mandalika Bhaskara Venkata, Syamsundar, Annamraju, Narasaiah, Nayaka
Format: Article
Language:English
Subjects:
Arc welding
CAE) and Design
Carbon
Carbon equivalent
Computer-Aided Engineering (CAD
Earthquake resistance
Earthquakes
Elongation
Engineering
Equivalence
Gas tungsten arc welding
Heat affected zone
Heat treating
Heating
Impact strength
Industrial and Production Engineering
Manganese
Martensite
Mechanical Engineering
Mechanical properties
Media Management
Microstructure
Optimization
Original Article
Process parameters
Rebar
Reinforcing steels
Steel
Structural steels
Tensile strength
Welding parameters
Yield strength
Yield stress
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Summary:High strength rebars are generally developed by increasing carbon and manganese contents depending on the size and strength capacity requirement. These elements in steel beyond certain level adversely affect weldability and impact toughness which are very critical for structural steels. In this study, an attempt has been made to analyse and optimize the welding parameters on higher carbon equivalent (0.60) of 36-mm-diameter structural rebar by Arc and TIG welding process to arrive at exact preheating temperature for obtaining desired weld properties at minimum possible cost. The basic aim of this work is to establish the welding process parameters on structural steel to use as an earthquake-resistant steel without compromising the properties such as yield strength, tensile strength, tensile strength to yield strength ratio, and minimum uniform elongation. Before and after the welding, changes in the microstructure and mechanical properties in the fusion zone and heat affected zone (HAZ) of the welds were investigated. From the results, it was observed that 150 °C is the optimum preheating temperature to obtain good welds. The microstructural studies revealed that martensite is not present in the HAZ of the 150 °C preheated sample and the same was substantiated from resultant mechanical properties also.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-021-08432-1