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Title: Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions

Abstract

Alloy AA6013 is easily welded by conventional arc welding processes as well as by high-energy-density processes. However, some physical properties, which are inherent to all aluminum alloys, have to be considered during welding. In comparison to steel, the high thermal conductivity of aluminum alloys requires the use of higher heat input for welding. This is realized by a greater welding current during GTAW of aluminum alloys. One of the main problems associated with LBW of aluminum alloys is the high surface reflectivity. In particular, the threshold intensity for the development of a keyhole is much higher for aluminum than for steel. Finally, aluminum alloys, and particularly the heat-treatable alloys, are sensitive to weld cracking. This phenomenon can be avoided by proper filler and base metal alloy selection and adequate filler metal dilution. In order to improve the mechanical integrity of Al-Mg-Si weldments, it would be desirable to study the microstructure of the FZ and of the HAZ, as well as the residual stress distribution. The present study was performed in order to show differences in microstructure, hardness profile and tensile strength of gas tungsten arc (GTA) and laser beam (LB) welded AA6013-T6 extrusions. In addition, grain boundary liquations and hotmore » tearing are discussed.« less

Authors:
 [1]; ;  [2]
  1. Colorado School of Mines, Golden, CO (United States). Center for Welding and Joining Research
  2. Daimler-Benz Aerospace Airbus GmbH, Bremen (Germany)
Publication Date:
OSTI Identifier:
227891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Welding Journal; Journal Volume: 75; Journal Issue: 4; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; GAS TUNGSTEN-ARC WELDING; LASER WELDING; WELDED JOINTS; MAGNESIUM ALLOYS; SILICON ALLOYS; MICROSTRUCTURE; MECHANICAL PROPERTIES; TENSILE PROPERTIES; HEAT AFFECTED ZONE

Citation Formats

Guitterez, L.A., Neye, G., and Zschech, E.. Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions. United States: N. p., 1996. Web.
Guitterez, L.A., Neye, G., & Zschech, E.. Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions. United States.
Guitterez, L.A., Neye, G., and Zschech, E.. Mon . "Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions". United States. doi:.
@article{osti_227891,
title = {Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions},
author = {Guitterez, L.A. and Neye, G. and Zschech, E.},
abstractNote = {Alloy AA6013 is easily welded by conventional arc welding processes as well as by high-energy-density processes. However, some physical properties, which are inherent to all aluminum alloys, have to be considered during welding. In comparison to steel, the high thermal conductivity of aluminum alloys requires the use of higher heat input for welding. This is realized by a greater welding current during GTAW of aluminum alloys. One of the main problems associated with LBW of aluminum alloys is the high surface reflectivity. In particular, the threshold intensity for the development of a keyhole is much higher for aluminum than for steel. Finally, aluminum alloys, and particularly the heat-treatable alloys, are sensitive to weld cracking. This phenomenon can be avoided by proper filler and base metal alloy selection and adequate filler metal dilution. In order to improve the mechanical integrity of Al-Mg-Si weldments, it would be desirable to study the microstructure of the FZ and of the HAZ, as well as the residual stress distribution. The present study was performed in order to show differences in microstructure, hardness profile and tensile strength of gas tungsten arc (GTA) and laser beam (LB) welded AA6013-T6 extrusions. In addition, grain boundary liquations and hot tearing are discussed.},
doi = {},
journal = {Welding Journal},
number = 4,
volume = 75,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1996},
month = {Mon Apr 01 00:00:00 EST 1996}
}