Title page for ETD etd-050806-132406

Document Type thesis

Author Name Legait, Pierre-Alexandre

URN etd-050806-132406

Title Formation and Distribution of Porosity in Al-Si Welds

Degree MS

Department Materials Science & Engineering

Advisors
Diran Apelian, Advisor
Diran Apelian, Advisor
Diran Apelian, Advisor
Diran Apelian, Advisor
Richard Sisson, Committee Member
Richard Sisson, Committee Member
Richard Sisson, Committee Member
Richard Sisson, Committee Member

Keywords
hot cracking
porosity
hot cracking
porosity
hot cracking
porosity
hot cracking
porosity

Date of Presentation/Defense 2006-04-10

Availability unrestricted

Abstract
Aluminum alloys are the subject of increasing interest (in the automotive industry, as well as aircraft industry), aiming to reduce the weight of components and also allowing a profit in term of energy saving. Concerning the assembly, riveting has been widely used in the aircraft industry, whereas welding seems to be promising in the car industry in the case of aluminum alloys.
Nevertheless, welding can generate defects, such as porosity or hot cracking, which could limit its development. One of the major problems associated with the welding of aluminum alloys is the formation of gas porosity. Aluminum alloy cleanliness remaining one of the aluminum industry’s primary concerns, this project focuses on the formation and distribution of porosity in Al-Si welds.
A literature review has been performed, to identify the mechanisms of porosity formation in welds and castings. Porosity distribution in welds has been investigated, based on three different welding techniques: hybrid Laser/MIG welding process, the electron beam welding process, and the MIG dual wire welding process. Porosity distribution results provide information on to the porosity formation mechanisms involved during welding. A complete microstructure, microhardness and EDX analysis have been carried out, to describe and quantify the solidification process within the welds.

Files
Legait.pdf

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Document Type	thesis
Author Name	Legait, Pierre-Alexandre
URN	etd-050806-132406
Title	Formation and Distribution of Porosity in Al-Si Welds
Degree	MS
Department	Materials Science & Engineering
Advisors	Diran Apelian, Advisor Diran Apelian, Advisor Diran Apelian, Advisor Diran Apelian, Advisor Richard Sisson, Committee Member Richard Sisson, Committee Member Richard Sisson, Committee Member Richard Sisson, Committee Member
Keywords	hot cracking porosity hot cracking porosity hot cracking porosity hot cracking porosity
Date of Presentation/Defense	2006-04-10
Availability	unrestricted
Abstract Aluminum alloys are the subject of increasing interest (in the automotive industry, as well as aircraft industry), aiming to reduce the weight of components and also allowing a profit in term of energy saving. Concerning the assembly, riveting has been widely used in the aircraft industry, whereas welding seems to be promising in the car industry in the case of aluminum alloys. Nevertheless, welding can generate defects, such as porosity or hot cracking, which could limit its development. One of the major problems associated with the welding of aluminum alloys is the formation of gas porosity. Aluminum alloy cleanliness remaining one of the aluminum industry’s primary concerns, this project focuses on the formation and distribution of porosity in Al-Si welds. A literature review has been performed, to identify the mechanisms of porosity formation in welds and castings. Porosity distribution in welds has been investigated, based on three different welding techniques: hybrid Laser/MIG welding process, the electron beam welding process, and the MIG dual wire welding process. Porosity distribution results provide information on to the porosity formation mechanisms involved during welding. A complete microstructure, microhardness and EDX analysis have been carried out, to describe and quantify the solidification process within the welds.
Files	Legait.pdf