Fiber Laser Welding of Dissimilar 2205/304 Stainless Steel Plates

Ghusoon Ridha Mohammed,Mahadzir Ishak,Syarifah Ahmad,Hassan Abdulhadi

doi:10.3390/met7120546

Ghusoon Ridha Mohammed, Mahadzir Ishak + Show 2 more

Open Access

https://doi.org/10.3390/met7120546

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Journal: Metals	Publication Date: Dec 6, 2017
Citations: 21	License type: CC BY 4.0

Affiliation: Universiti Malaysia Pahang, Middle Technical University

Abstract

In this study, an attempt on pulsed-fiber laser welding on an austenitic-duplex stainless steel butt joint configuration was investigated. The influence of various welding parameters, such as beam diameter, peak power, pulse repetition rate, and pulse width on the weld beads geometry was studied by checking the width and depth of the welds after each round of welding parameters combination. The weld bead dimensions and microstructural progression of the weld joints were observed microscopically. Finally, the full penetration specimens were subjected to tensile tests, which were coupled with the analysis of the fracture surfaces. From the results, combination of the selected weld parameters resulted in robust weldments with similar features to those of duplex and austenitic weld metals. The weld depth and width were found to increase proportionally to the laser power. Furthermore, the weld bead geometry was found to be positively affected by the pulse width. Microstructural studies revealed the presence of dendritic and fine grain structures within the weld zone at low peak power, while ferritic microstructures were found on the sides of the weld metal near the SS 304 and austenitic-ferritic microstructure beside the duplex 2205 boundary. Regarding the micro-hardness tests, there was an improvement when compared to the hardness of duplex and austenitic stainless steels base metals. Additionally, the tensile strength of the fiber laser welded joints was found to be higher when compared to the tensile strength of the base metals (duplex and austenitic) in all of the joints.

Highlights

In the automotive, oil, aerospace, and nuclear power industries, the welding of dissimilar materials is a strategic area of interest [1,2]
Macrostructure, microstructure, and phase composition, using an optical microscope (OM) and scanning electron microscopy (SEM) coupled with an energy dispersive spectrometer duplex and AISI 304 austenitic stainless steels were the metals used in this study, 2.1
The metal plates were shaped to sizes, AISI 2205 duplex and AISI 304 austenitic stainless steels were the metals used in this study, with

Summary

Introduction

Oil, aerospace, and nuclear power industries, the welding of dissimilar materials is a strategic area of interest [1,2]. Owing to the differences the metallurgical and physico-mechanical behaviour of joined dissimilar materials (DM), they have attracted significant interest when compared to the joints of similar materials. There is an increased risk of encountering problems with DM during welding and in the resultant weldments. The noted problems with DM welding include (a) carbon migration from materials higher carbon content to the materials with less carbon content; (b) the variation in the thermal expansion coefficient of the materials, triggering a deviation of the thermal residual stress over disparate parts of the weldments; and, (c) the challenges in the execution of the post-welding heat treatment, especially

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Conclusion