Fiber Laser Welding of Dissimilar 2205/304 Stainless Steel Plates

Abstract

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.

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

“…The main disadvantage of EW is its use of thin sheets. Mohammed et al [29] studied the fiber laser welding of duplex stainless steel 2205 and austenitic stainless steel 304. From the SEM results, formation of micro-voids confirmed the ductile mode of fracture.…”

Accurate Prediction of the Weld Bead Characteristic in Laser Keyhole Welding Based on the Stochastic Kriging Model

“…In this work, the 25 sample points were randomly divided into five groups, and each of them consists five sample points. The order of groups was G k = {(13, 23, 22, 2, 3) , (24,18,16,6,21), (20,12,5,10,9), (11,7,1,4,14), (25,8,19,17,15)}, where the number corresponded to the No. in Table 2.…”

“…As intelligent manufacturing develops, accurate predicting of weld bead is becoming crucial to accomplishing industrial automation [1,2]. Therefore, it is necessary to establish the relationships between the laser keyhole welding process parameters (WPP) and weld bead geometry to predict the weld bead quality [3][4][5]. However, the relationship between the WPP and the weld bead is highly nonlinear [6].…”

Autogenous Fiber Laser Welding of 316L Austenitic and 2304 Lean Duplex Stainless Steels

“…However, among the various austenitic consumables, the most beneficial, both in terms of strength properties, as well as morphology and corrosion resistance, is the use of 309L [ 47 , 48 ] or super austenitic 904L filler metal [ 49 ]. The literature also describes attempts to weld such a material combination without filler material: using different variants of the TIG process [ 50 , 51 ] or concentrated welding sources [ 33 , 52 , 53 ]. Ridha Mohammed et al stated that the mechanical properties of the duplex-austenitic steel fiber laser joints were better compared with the base materials (BM) because of the small HAZ [ 52 ].…”

“…The literature also describes attempts to weld such a material combination without filler material: using different variants of the TIG process [ 50 , 51 ] or concentrated welding sources [ 33 , 52 , 53 ]. Ridha Mohammed et al stated that the mechanical properties of the duplex-austenitic steel fiber laser joints were better compared with the base materials (BM) because of the small HAZ [ 52 ]. In the same work, the authors found the presence in welded joints the regions with a completely austenitic solidification mode which were susceptible to solidification cracking.…”