THE INFLUENCE OF ELECTRIC ARC ACTIVATION ON THE SPEED OF HEATING AND THE STRUCTURE OF METAL IN WELDS

Abstract

This paper presents the results of a research related to the impact of electric arc activation onto drive welding energy and metal weld heating speed. It is confirmed that ATIG and AMIG methods, depending on metal thickness, single pass weldability and chemical composition of activating flux, enable the reduction of welding energy by 2-6 times when compared to conventional welding methods. Additionally, these procedures create conditions to increase metal weld heating speed up to 1,500-5,500 °C/s-1. Steel which can be rapidly heated, allows for a hardened structure to form (with carbon content up to 0.4%), together with a released martensitic structure or a mixture of bainitic-martensitic structures. Results of the research of effectiveness of ATIG and AMIG welding showed that increase in the penetration capability of electric arc, which increases welding productivity, is the visible side of ATIG and AMIG welding capabilities.

Keywords

Dates

  • Submission Date2014-05-30
  • Revision Date2014-04-10
  • Acceptance Date2014-04-23
  • Online Date2014-11-08

DOI Reference

10.2298/TSCI140530125S

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