dc.contributor.advisor |
Ganguly, Supriyo |
|
dc.contributor.advisor |
Williams, Stewart W. |
|
dc.contributor.author |
Rodrigues Pardal, Goncalo Nuno |
|
dc.date.accessioned |
2016-06-23T12:58:21Z |
|
dc.date.available |
2016-06-23T12:58:21Z |
|
dc.date.issued |
2016-05 |
|
dc.identifier.uri |
http://dspace.lib.cranfield.ac.uk/handle/1826/10007 |
|
dc.description.abstract |
Dissimilar welding has been subject of several investigations due to its potential
importance in various industrial fields such as transportation, energy generation
and management. Dissimilar welding can increase the design efficiency, by the use
of complementary alloys with different properties, cost cutting and light weighting
structures. The use of different materials within a component or structure to best
suit a particular task, requirement or increase its life and performance has always
been an ambition of several designers and engineers.
This project investigated the joining steel and aluminium for the automotive industry
and also stainless steel and titanium to be applied in the civil nuclear energy
generation industry. These dissimilar metallic combinations are metallurgically
incompatible and the formation of brittle intermetallic phases (IMC) need to be
controlled or eliminated.
To join steel to Al, laser spot welding process was selected, to avoid the bulk
melting of steel and Al at the joint interface that enhance the formation of brittle
IMC. This part of the work was focused in controlling the joining process to control
the IMC formation of galvanized and uncoated steel to Al and verify if it was
possible to have a sound and reliable joint in the presence of an IMC layer.
In the second part of this study, stainless steel to titanium joining, a different
approach was taken with the application of weld metal engineering to modify or
eliminate the IMC formation. Several metals were evaluated as potential interlayers
to use and laser welding with a Ni interlayer was evaluated with moderate success,
due to the modified IMC with improved mechanical properties and the good
compatibility between Ni and the stainless steel. A further improvement was
achieved when Cu was brazed between stainless steel and Ti using CMT (Cold
Metal Transfer) a low heat input MIG process. The final attempt was to use a
different interlayer that was 3D printed and deposited in several layers. This
interlayer was composed Cu and Nb that were selected as candidates to avoid the
IMC formation between the stainless steel and Ti. With this approach it was
possible to build an IMC free component and possibly improve and avoid IMC
formation in several other dissimilar metallic combinations. |
en_UK |
dc.language.iso |
en |
en_UK |
dc.publisher |
Cranfield University |
en_UK |
dc.rights |
© Cranfield University, 2016. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. |
en_UK |
dc.subject |
Welding |
en_UK |
dc.subject |
Laser |
en_UK |
dc.subject |
GMAW |
en_UK |
dc.subject |
GTAW |
en_UK |
dc.subject |
Copper |
en_UK |
dc.subject |
Niobium |
en_UK |
dc.title |
Joining of steel to aluminium and stainless steel to titanium for engineering applications |
en_UK |
dc.type |
Thesis or dissertation |
en_UK |
dc.type.qualificationlevel |
Doctoral |
en_UK |
dc.type.qualificationname |
PhD |
en_UK |