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research-article

Design of TiO2-SiO2-MgO and SiO2-MgO-Al2O3 based submerged arc fluxes for multipass bead on plate pipeline steel welds

[+] Author and Article Information
Lochan Sharma

Research Scholar, Mechanical Engineering Department, IIT Jodhpur, Rajasthan, 342037, India
sharma.11@iitj.ac.in

Rahul Chhibber

Asst. Professor, Mechanical Engineering Department, IIT Jodhpur, Rajasthan, 342037, India
rahul_chibber@iitj.ac.in

1Corresponding author.

ASME doi:10.1115/1.4043375 History: Received July 29, 2018; Revised March 21, 2019

Abstract

HSLA steels are widely used in different applications like oil and gas transmission line pipes, pressure vessels and offshore oil drilling platforms. Submerged arc welding is mainly used to weld high thickness steel plates. Flux composition and welding parameters play an important role in determining the adequate quality and mechanical properties of the weld. Agglomerated fluxes were formulated based on TiO2-SiO2-MgO and SiO2-MgO-Al2O3 flux system using constrained mixture design and extreme vertices design approach. The chemical compositions of the bead on a plate have been studied using formulated fluxes. Twenty-one beads on plates were applied using submerged arc welding process keeping the parameters: current, voltage and welding speed constant. Regression models were developed for bead on plate content in terms of individual, binary and ternary mixture flux constituents for submerged arc multipass bead on plate deposition for pipeline steel (API 5L X70). Regression mathematical models have been checked for 95% significance level using F-test and t-test. In the present study, chemical composition, grain size and microhardness properties of the multi-pass bead on a plate (for API 5L X70 grade pipeline) was optimized using multi-objective optimization approach. Individual flux mixtures TiO2, SiO2, MgO and Al2O3 tend to decrease the carbon content whereas SiO2.Al2O3 and MgO.Al2O3 are the only binary mixture which shows synergistic effect and increase the carbon content. Binary mixture TiO2.Al2O3 shows an insignificant anti-synergistic effect on muti-pass bead on a plate carbon content.

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