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Title: Toward developing a SMA welding electrode for HSLA-100 grade steel

Abstract

A sequential flux coating formulation methodology was used to study the effects of welding flux type on high-strength steel weld metal microstructure and properties. Systematic variations in flux composition were made starting with an initial flux that can be classified as rutile-based and ending up with a more basic flux. The objective of these variations was to identify/develop a formulation of a SMA welding electrode flux that would exhibit the excellent welding behavior found typically in a rutile electrode,m balanced with the superior weld metal properties deposited by a basic electrode. Nine separate series of electrodes were investigated, each with one substitution for a specific component in the flux. The electrode that produced the best results for a given series was used as the basis for the formulation of the next series. The best experimental electrode formulated produced welds exhibiting an estimated yield strength of approximately 800 MPa and acceptable toughness at {minus}60C in single-pass welds. The weld metal impact fracture appearance at this temperature was predominantly ductile. The microstructure of this weld deposit was characterized by 60 vol-% acicular ferrite and 30 vol-% lath martensite. The dual-phase microstructure and the 2:1 acicular ferrite-to-martensite volume ratio were results of controlledmore » additions of titanium in the weld metal, at approximately 150 ppm. The weld metal oxygen was approximately 400 ppm.« less

Authors:
; ; ;  [1]
  1. Colorado School of mines, Golden, CO (United States). Center for Welding and Joining Research
Publication Date:
OSTI Identifier:
253659
Resource Type:
Journal Article
Journal Name:
Welding Journal
Additional Journal Information:
Journal Volume: 75; Journal Issue: 6; Other Information: PBD: Jun 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; WELDED JOINTS; MICROSTRUCTURE; MECHANICAL PROPERTIES; LOW ALLOY STEELS; SHIELDED METAL-ARC WELDING; WELDING RODS; WELDING FLUXES; CHEMICAL COMPOSITION

Citation Formats

Fleming, D A, Bracarense, A Q, Liu, S, and Olson, D L. Toward developing a SMA welding electrode for HSLA-100 grade steel. United States: N. p., 1996. Web.
Fleming, D A, Bracarense, A Q, Liu, S, & Olson, D L. Toward developing a SMA welding electrode for HSLA-100 grade steel. United States.
Fleming, D A, Bracarense, A Q, Liu, S, and Olson, D L. Sat . "Toward developing a SMA welding electrode for HSLA-100 grade steel". United States.
@article{osti_253659,
title = {Toward developing a SMA welding electrode for HSLA-100 grade steel},
author = {Fleming, D A and Bracarense, A Q and Liu, S and Olson, D L},
abstractNote = {A sequential flux coating formulation methodology was used to study the effects of welding flux type on high-strength steel weld metal microstructure and properties. Systematic variations in flux composition were made starting with an initial flux that can be classified as rutile-based and ending up with a more basic flux. The objective of these variations was to identify/develop a formulation of a SMA welding electrode flux that would exhibit the excellent welding behavior found typically in a rutile electrode,m balanced with the superior weld metal properties deposited by a basic electrode. Nine separate series of electrodes were investigated, each with one substitution for a specific component in the flux. The electrode that produced the best results for a given series was used as the basis for the formulation of the next series. The best experimental electrode formulated produced welds exhibiting an estimated yield strength of approximately 800 MPa and acceptable toughness at {minus}60C in single-pass welds. The weld metal impact fracture appearance at this temperature was predominantly ductile. The microstructure of this weld deposit was characterized by 60 vol-% acicular ferrite and 30 vol-% lath martensite. The dual-phase microstructure and the 2:1 acicular ferrite-to-martensite volume ratio were results of controlled additions of titanium in the weld metal, at approximately 150 ppm. The weld metal oxygen was approximately 400 ppm.},
doi = {},
journal = {Welding Journal},
number = 6,
volume = 75,
place = {United States},
year = {1996},
month = {6}
}