Mechanical and Microstructural Evaluation of DMAG Welding of Structural Steel

Author:

Mert Tolga1,Gultekin Nurullah1,Karaaslan Ahmet2

Affiliation:

1. Department of Mechanical Engineering, Yildiz Technical University, Besiktas, 34349 Istanbul, Turkey

2. Department of Metallurgical and Materials Engineering, Yildiz Technical University, Esenler, 34210 Istanbul, Turkey

Abstract

Double channel torch, which allows concentric flow of two different shielding gases, was designed and manufactured in order to pursue double channel torch gas metal arc welding of unalloyed structural steel S235JR (EN 10025-2) with fourteen passes. Tensile and Charpy V-notch tests were realized and the results were compared with those of conventional gas metal arc welding. In order to evaluate mechanical testing results, microstructural analyses were conducted. It was found that the increase with double channel gas metal arc welding process in yield and tensile strengths as well as in toughness tests, especially in subzero temperatures, compared with conventional gas metal arc welding was due to longer columnar grains and finer tempered zone grain structure between passes and due to solidification and less dendritic structure formation in all-weld metal in double channel gas metal arc welding.

Publisher

SAGE Publications

Subject

Mechanical Engineering

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