Microstructure and Mechanical Behavior of AISI 430 FSS Welds Produced with Different Elemental Metal Powder Addition

Abstract

In this study the effect of the Titanium and aluminum powder addition on microstructure and mechanical properties of AISI 430 ferritic stainless steel welds produced by gas tungsten arc welding was investigated. It’s observed that the addition of aluminium (Al) or titanium (Ti) reducing the grains size, increase the equiaxed grains fraction and improve the mechanical properties with varying degrees. While the addition of mixture (Al+Ti) leads to better improving in mechanical properties and reducing of grains size up to 85 %. The details of tensile tests, optical microscopic observations, microhardness, tensile test and Scanning electron microscopy (SEM) fractography, are discussed.

Optimization of TIG Welding Process Parameters for X70-304L Dissimilar Joint Using Taguchi Method

“…In this work, the outputs parameters are defined as hardness and tensile strength, knowing that the main aspect of Taguchi analysis is the maximization of outputs parameters [14][15][16][17]. However, the maximization of hardness has frequently present hardened zones of HAZ in weld joint [5][6]; this can cause mechanical failure of welds, and later a brittle fracture. Thus, it must focus on minimizing hardness values by lowering Hardness peaks across X70/304L dissimilar weld joint between HAZ and BM.…”

“…At welding thermal cycles welding, weld joints are subject of metallurgical transformations. It is well known that nickel and carbon, Manganese, chromium, iron element, have a strong metallurgical effect on carbide precipitation and phase transformation in low Carbone alloys and stainless steels [5,6]. Therefore, the effect of these elements on phase transformation can be estimated by decreasing or increasing of Cr and Ni percentage in stainless steel [6,8,14].…”

“…Dissimilar welds combined the attractive properties of HSLA and SS steels such as high strength, highly resistant to corrosion cracking. However, it was apparent that the weldability to joint HSLA to SS steels remained a welding challenge, because these dissimilar combinations were strongly related to the formation of brittle microstructures in heat affected zone (HAZ) and fusion zone (FZ) [6]. In dissimilar weld joints, the mechanical properties changes vary sharply and from fusion zone to base materials [7].…”

Microstructural and mechanical characterization of HSLA X70 Welded joints using eddy current testing (ECT)

“…In addition, the safety of welded installations requires good mechanical property to prevent bursting and damage to pipelines. Indeed, it during the welding operation, the residual stresses state and microstructural evolution of weld joint cause a reduction in weld characteristics, mainly on the mechanical properties [6,7]. Thus, the need to characterize weld damage is real, through easily methods in a short time, which permit it will not affect or cut the welded pipe structure to take specimens.…”

Study of the influence of wire metals on dissimilar welds

“…Currently, DWJ is used to assemble two different materials that have not the same chemical composition. This process can be found in many different fields such as power plants, pipeline and automobile industry [3][4][5]. Their mechanical properties changes vary sharply from fusion zone to base materials, due mainly to the heterogeneity of microstructures across DWJ.…”