Mathematical Modeling of the Mechanical Tensile Strength of the Thick Carbon Steel Plates Weld with the Narrow Gap and Variable Chamfer Angles

This article presents research results pertaining to the computation, data processing through experimental statistics, and the development of a mathematical model that elucidates the interplay between welding process parameters, specifically welding amperage (Ih), weld speed (vh), and chamfer angle (α), in the context of narrow gap welding. The primary objective of this study is to establish a goal function capable of predicting the quality of butt weld joints in thick carbon steel plates, specifically SS400. The experimental setup employed in this study encompasses the utilization of LINCOLN's advanced MAG welding machines, specifically the PLEXTEC®500x model, renowned for their industrial manufacturing capabilities. The obtained results reveal that the mechanical tensile strength of the weld material falls within the average range of σk = 460.016 ÷ 540.066 MPa. These findings substantiate the fulfillment of the technical requirements necessary for welded structures in real-world production scenarios in Vietnam.