Factors influencing the microstructure and mechanical properties of ultra low carbon bainitic 100 tungsten inert gas multipass weldments.
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Author
McDonald, Eugene Paul
Date
1992-09Advisor
Fox, Alan G.
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Show full item recordAbstract
The U.S. Navy has maintained a continuous research, development and
certification program in HSLA and ULCB steels with the intent of someday totally
replacing the HY steels now used in ship construction. A major advantage in using
HSLA and ULCB steels is their increase in weldability over the HY steels which
now require large amounts of preheating to prevent crack formation in the heat
affected zone. Up until the present day, however, low carbon HSLA and ULCB
steels have not been used with a dedicated low carbon weld wire. In the present work
an attempt was made to correlate the mechanical properties (tensile strength, yield
strength and Charpy impact energy), chemical composition and microstructure of a
series of autogenous multirun TIG welds on ULCB steels. It was found that good
combinations of weld strength and toughness could be achieved with appropriate
choice of weld metal chemistry and TIG welding power, but that there was a ceiling
of about 2.0wt.% molybdenum which could be tolerated before weld metal
embrittlement became evident.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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