Mechanical & Microstructural Analysys Of Armor Steel Welded Joints

Year 2020, Volume: 12 Issue: 1, 166 - 175, 31.01.2020

Tekin Özdemir

https://doi.org/10.29137/umagd.488104

Cited By: 1

Abstract

One of the main
construction materials used in armor vehicles is Mil-A 46100 Armor Steel. The
importance of the material arises from its mechanical properties such as
hardness and explosive protection capability. MIG (Metal Inert Gas) welding technique is principally
based on welding metals via electric arc where the arc is continous between
metals and welding wire. In case welded metals are steel based materials, O₂
and CO₂ are added in portective gases in order to prevent
unexpected welding defects. In MIG welding applications, the amount of ferrit
in the chemical structure of the armor steel may result in some unexpected
affects due to its decreasing characteristic on ductility and toughness. The
welding wires used in MIG operations may exibit different fracture
characteristics; as some specimen show ductile fracture characteristics, the
rest may show brittle. Charpy Impact Test is one of the effective tests to
determine the impact energy and the fracture times of welded metals. In this
study, it is aimed to determine the relations between micro-structural results
and fracture times of the welded parts of Mil-A 46100 steels via MIG
applications.

Keywords

MIG, Welding, Fracture energy, Brittle, Ductile

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