Feasibility studies of the weldability of structural steels used in the offshore environment
Omajene, Joshua Emuejevoke (2013)
Diplomityö
Omajene, Joshua Emuejevoke
2013
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201306134009
https://urn.fi/URN:NBN:fi-fe201306134009
Tiivistelmä
The rising demand for oil and gas has made it very necessary for the oil and gas industries to
explore the offshore. There is a huge resources which is available in the offshore. The search
for oil and gas is faced with greater challenges because of the nature of the marine
environment as it poses difficult and harsh conditions for the construction of offshore
structures. The major problem of the construction of offshore structure is the ability to produce
a sound weld that gives the whole structure the structural integrity needed to withstand the
harsh environmental conditions. This research work presents the performance of typical
offshore steels with improved weldability. The ability of reducing the carbon content of
thermo-mechanically rolled steels down to 0.08% makes it possible to achieve good
weldability, toughness and strength for high strength steels used in offshore applications.
Importantly, the ideal welding procedure should be strictly followed as recommended. The
fabrication process is as important as the welding procedure in achieving a sound weld which
is free of weld defects such as hydrogen induced cracking, lamellar tearing and solidification
cracking. This research work also considers the corrosion as it affects offshore structure and
necessary measures to mitigate the problem caused by corrosion.
explore the offshore. There is a huge resources which is available in the offshore. The search
for oil and gas is faced with greater challenges because of the nature of the marine
environment as it poses difficult and harsh conditions for the construction of offshore
structures. The major problem of the construction of offshore structure is the ability to produce
a sound weld that gives the whole structure the structural integrity needed to withstand the
harsh environmental conditions. This research work presents the performance of typical
offshore steels with improved weldability. The ability of reducing the carbon content of
thermo-mechanically rolled steels down to 0.08% makes it possible to achieve good
weldability, toughness and strength for high strength steels used in offshore applications.
Importantly, the ideal welding procedure should be strictly followed as recommended. The
fabrication process is as important as the welding procedure in achieving a sound weld which
is free of weld defects such as hydrogen induced cracking, lamellar tearing and solidification
cracking. This research work also considers the corrosion as it affects offshore structure and
necessary measures to mitigate the problem caused by corrosion.