Abstract
The steel run-off plates attached at the start and end of a weld usually have the same material, shape, and groove as the base metal according to the rules for designing and constructing ship steel structures. However, rather than using the same grade of base steel, readily available steel is often used for these plates to increase material utilization. When using dissimilar grade steel as a run-off plate, the physical properties of the base metal may be diluted if the weld joint of the base plate is penetrated, thereby lowering the physical property value of the joint. If the physical properties of the welded part of the real structure are lowered because of the dilution of the properties of the dissimilar grade steel material, the safety of the entire structure can be affected. Therefore, in this study, analyses of the metal microstructure, hardness, impact, and chemical composition were performed on surfaces where the run-off plate was removed after welding to examine the effect of dissimilar run-off plate. The results of this study reveal that the properties of the run-off plate were not diluted toward the base metal and the Charpy impact value at the weld end was up to 48% greater than the impact value at the start of the weld at a temperature of −40 °C.
Highlights
Run-off plates are temporarily attached to steel structures for a variety of purposes
A light-emission analysis and an emission spectrochemical analysis were performed to Master Xpert) is a method of quantitatively analyzing the spectral intensity examine whether the metal component of the run-off plate was moved to the base material emitted from samplespectrochemical and determining the
To investigate the effect of the material properties of the steel used in the run-off plate plate on the physical properties of the base metal after the run-off plates were removed, on the physical properties of the base metal after the run-off plates were removed, the the microstructure, hardness test, Charpy impact test, and chemical compositions of the microstructure, hardness test, Charpy impact test, and chemical compositions of the welding metal were compared and evaluated
Summary
Run-off plates are temporarily attached to steel structures for a variety of purposes. They are attached to the weld-line extension of the base material during welding operations (e.g., butt welding, head welding of flanges and webs, and edge welding) [1]. The run-off plate has the same material, shape, and groove properties as the base metal. Run-off plates are used to stably generate arcs at the beginning and end of the welding process. Without a run-off plate, defects including blowholes and craters are more likely [1]. The run-off plates help prevent defects from propagating to the base material
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