Measurement of local mechanical properties in pipeline steel welds using instrumented indentation and digital image correlation

A.R. Midawi
N. Huda, Y. Kisaka
R. Lazor, A.P. Gerlich

Presented At: 
CanWeld Conference 2015

The use of standard tensile testing is not practical to distinguish the properties of as-deposited from the reheated weld metal, or the heat affected zone since it is not feasible to isolate these weld regions. However, the as-deposited or reheated weld metal regions are completely different in terms of mechanical properties, and typical allweld metal samples may only determine the average weld metal properties. In addition, most pipeline construction companies have started to use narrow groove design configuration in order to reduce the fusion zone and heat affected zone size, making it more difficult to measure properties in these regions, particularly zones close to the fusion line. In the current study, a new indentation approach was used to measure the yield strength for X80 base metal and across the weld metals on multipass welds made by using different consumables. Standard tensile testing was performed for both base metal and welding conditions in order to compare the yield strength values with the indentation test results. The results indicated a good agreement between the indentation measurements and standard tensile testing. The yield strength values were also compared in the weld metal and HAZ. Digital Image Correlation (DIC) was also used to validate the local yield strength measurements obtained from the instrumented indentation method. DIC results also suggested yield strength results in individual zones were comparable to those made by instrumented indentation.

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