Accession Number:

ADA169067

Title:

The Influence of Welding Flux on the Pyrometallurgical, Physical and Mechanical Behavior of Weld Metal.

Descriptive Note:

Final rept. 15 Feb 83-14 Feb 86,

Corporate Author:

COLORADO SCHOOL OF MINES GOLDEN CENTER FOR WELDING RESEARCH

Personal Author(s):

Report Date:

1986-05-15

Pagination or Media Count:

24.0

Abstract:

The pyrochemical behavior of submerged arc welding flux was investigated. The nature of the pryochemical reactions are described. Mechanistic models for the pryochemical behavior are suggested. The submerged arc welding was performed on both low carbon and high strength low alloy steels. Both thermodynamic and kinetic models are discussed. Ferrous weld metal phase transformations were investigated. The role of weld metal oxygen, weld metal inclusion and strain on the formation of acicular ferrite was characterized, analyzed and modeled. Advanced high purity - homogeneous multi-component welding fluxes were made using the sol gel process for making glass. These sol gel fluxes were used to make flux cored wires. The sol gel filled flux cored wires were used to weld microalloyed HSLA steels and were found to have excellent arc stability and low moisture content. Sol gel fluxes offer the consistency necessary for welding systems which will use in situ sensing and microprocessor control. A capacitance technique has been developed for moisture content measurements of the coating on covered electrodes. Aluminum weld metal cracking has been characterized for both binary and commercial aluminum alloys. A new model for the prediction of the susceptible and extent of hot cracking has been developed.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE