Influence of Heat Input and Lack of Penetration Length on Static Tensile Strength of High-Strength Structural Steel Weldments.
ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF CIVIL ENGINEERING
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This report presents findings of an investigation of the influence of heat input and lack of penetration LOP length on static tensile properties of A517USS T-1 steel weldments. Heat inputs of 20, 30, 50, and 90 kJin. were studied in full penetration welds. Results showed that tensile properties of the weld metal were maximized at 30 kJin. heat input. In full-length LOP specimens, it was shown that tensile strength decreased and ductility increased with increasing heat input. The tensile strength and ductility of partial-length LOP were observed to drop sharply with increasing LOP length, up to an LOP-length-to-specimen-width ratio of about 0.6. At larger ratios, partial-length LOP behaved, in effect, like full-length LOP. A formula was derived for predicting the tensile strength of partial-length LOP as a function of LOP length. Quantitative relationships are expressed between LOP defect size, defect length, and tensile properties. The ranges of allowable LOP defect sizes and lengths for which tensile strength may not be seriously affected is thus established. However, designs requiring high ductility may be very intolerant of LOP defects. Author
- Metallurgy and Metallography
- Couplers, Fasteners and Joints