Comparative analysis of hardness in different zones of weld
Journal Title: Proceedings in Manufacturing Systems - Year 2015, Vol 10, Issue 3
Abstract
This paper studies the HV 10 Vickers hardness values measured on the end zones (beginning and end) of the samples taken for approval of welding technologies to analyze the situation less common welding technology without end plates. These values are then compared with those determined by measurements made in areas of welds means to assess the degree of deviation from the recommended values for steel grade analyzed. It was chosen for homologating of a welding process a steel sheet of thickness 20 mm of P355NL1 quality welded by the processes 141 + 111 + 121. The work presents the macroscopic and microscopic analysis of samples and preheats temperature calculation, calculation and estimation of carbon equivalent maximum hardness in the heat affected zone when welding steel P355NL1. In these areas of the beginning and end of the seam, there is a situation similar to welding the weld below 100 mm in length, where the thermal field propagates in welding non-steady state compared to the middle portion of long welded row, where the heat propagates quasi-stationary regime.
Authors and Affiliations
Nicolae GRIGORE
Keywords
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