Experimental Investigation of the Effect of Surface Markings on the Mechanical Integrity of Weathering Bridge Steels - Phase II

The purpose of this proposed work is to study the effect of plasma scribe notch depth on microstructure and fatigue properties of 50W weathering bridge steel. Scribing parameters, which include writing speed and Amperage, will be altered resulting in varying notch depth and heat affected zone (HAZ) size. A relationship between plasma writing parameters and notch depth/HAZ will be revealed, as well as the dependence of fatigue life on increasing notch depth. The overall goal of this study is to provide textual guidelines for marking bridge steels for future standardization and implementation.