In the present study, two different types of coatings such as Cobalt (Co-Cr-W-C) and Nickel (Ni-Cr-B-Si-C) based layers have produced using a high power of Ytterbium-doped yttrium aluminum garnet (...

Laser cladding process of Cobalt and Nickel based hard-micron-layers on 316L-stainless-steel-substrate

Influence of heat input on welding induced distortion for Yb-fibre laser welded thin sheets

Assessment by destructive and non-destructive approach to characterize 90/10 cupronickel weldments

Influence of tool rotational speed on mechanical properties of aluminium alloy AA 7075-T6 during friction stir welding process

The utility of recent manufacturing concepts and advanced materials is of greater interest to manufacturers of automobile and aerospace industries to reduce weight, cost and enhance part performance. In spite of various advantages associated with the use of tailor-welded blanks (TWBs), joining of TWBs is challenging due to the variation in their properties and thickness. The principal objective of this paper is to make a detailed study for microstructural (optical microscopy) and mechanical characterization (uniaxial tensile test, Vickers micro-hardness) of the steel assemblies formed by autogenous joining of SS 316L (0.8 mm) and SS 310 (0.6 mm) using micro-plasma arc welding process (µ-PAW). This study constructs the capability of µ-PAW process for joining dissimilar materials of different thickness autogenously and producing good quality joint using considerably reduced power as compared to laser and electron beam welding processes.

Joining of Different Thickness Dissimilar Materials SS 316L/SS 310 By µ-PAW Process

Present work is focused on the autogenous joining of tailored blanks, that is, sheets of different thickness but of the same material (austenitic stainless steel grade SS 316L). A thin sheet (1mm) ...

Investigations on joining of stainless steel tailored blanks by µ-PTA process

With the miniaturization of the components, micro-fabrication has gained significant attention for the application in micro-devices. The current work aims to weld dissimilar austenitic stainless steels with different thickness (average ~ 700 µm) by downscaling the traditional arc-based joining process. Micro-plasma arc welding (µ-PAW) with less than 15 A current is used to fabricate the weld joints at different heat input, which can be reviewed as a substitute for laser and electron beam welding process in terms of cost-effectiveness. The welding fixture employed to hold the small workpiece contributes significantly to achieve the complete establishment of the µ-PAW process. A low amount of heat input leads to reduced dendritic and secondary dendritic arm spacing, which increases the joint efficiency up to ~ 115%. A high value of heat input changes the mode of failure from ductile to mixed mode due to micro/macro-voids’ existence, decreases the corrosion resistance due to chromium depletion from 25 to 17 wt.%, and increases the number and size of the pores. A finite element-based computational model is also employed to presume the geometrical dimensions of the weld joint that agree well with the experimentally determined values with a maximum error of 9%.

Swagat Dwibedi

Papers

Investigations on joining of stainless steel tailored blanks by µ-PTA process

Assessment by destructive and non-destructive approach to characterize 90/10 cupronickel weldments

Joining of Different Thickness Dissimilar Materials SS 316L/SS 310 By µ-PAW Process

Development of Micro-plasma Arc Welding System for Different Thickness Dissimilar Austenitic Stainless Steels

Influence of process parameters on microstructural evolution, solidification mode, and impact strength in joining of stainless steel thin sheets