INVESTIGATION OF THE MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF DP500 AND DP700 QUALITY STEELS WELDED WITH DIFFERENT HEAT INPUTS

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2023-1-25

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Yılmaz, Kardelen

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In this study, effect of different heat input values from different welding techniques on microstructural and mechanical properties of Dual Phase (DP) steel DP500 and DP700 are evaluated. The welding operations were carried out manually by using Tungsten Inert Gas Welding (TIG), Metal Active Gas (MAG) Pulse Arc Welding and MAG Cold Metal Transfer (CMT) arc methods with keeping different heat inputs. The specimens were welded under specified conditions. They were initially evaluated by metallographic methods. In addition, destructive tests such as tensile testing and bending testing were also applied. Different heat inputs and cooling rates causes different phase formations and mechanical properties in various welding regions. The study concludes that MAG CMT medium heat input value is the optimum condition due to bainite formation, high toughness, tensile strength, ductility. Furthermore, Heat Affected Zone (HAZ) softening also is the lowest in MAG CMT method.

Subject Keywords

DP steels, Microstructure, Mechanical Properties, TIG and MAG Welding

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https://hdl.handle.net/11511/102517

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

K. Yılmaz, “INVESTIGATION OF THE MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF DP500 AND DP700 QUALITY STEELS WELDED WITH DIFFERENT HEAT INPUTS,” M.S. - Master of Science, Middle East Technical University, 2023.