Effect of Heat Sink and Cooling Mediums on Ferrite Austenite Ratio and Distortion in Laser Welding of Duplex Stainless Steel 2205

Abstract

In order to control the ferrite and austenite percentage in duplex stainless steel welding, many researchers try to change the laser welding parameters and cooling medium, but ignore to study the influence of heat sink effect on weld strength. In this work, the effect of aluminium heat sink and varying cooling medium on the laser welding of duplex stainless steel (DSS) 2205 is studied. The 2 mm thick DSS sheets welded with pulsed Nd: YAG laser welding machine by varying the cooling medium (air and oil) and an aluminium plate used as a heat sink. The welded specimens tested for tensile strength, micro-hardness, distortion, microstructure and radiography analysis. The faster cooling rate in the oil quenching process enhances the ferrite percentage compared with air-cooled samples. But the faster cooling rate in oil quenching leads to more distortion and using aluminium as a heat sink influenced positively the distortion to a small extent. The lower cooling rate in air quenching leads to a higher tensile strength of the welded specimen. The objective of this work is to analyse experimentally the effect of cooling medium and heat sink in the mechanical and metallurgical properties of laser welded duplex stainless steel. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Fatigue Resistance and Failure Behavior of Penetration and Non-Penetration Laser Welded Lap Joints

“…The welding heat input is asymmetrical in the thickness of the non-penetration plate, where the solidification and phase transformation of the weld bead are not synchronized with the cooling contraction of the partial non-penetrated plate, and the constraint of free expansion and contraction of the weld bead in the non-penetration plate is greater than that of the penetration plate. Therefore, the residual stress near the weld fusion line of the non-penetration plate is much higher than that of the penetration plate [21][22][23].…”

Effect of Quenching Media on Laser butt Welded Joint on Transformed -Induced Plasticity (TRIP) Steel

“…The steel structure and grain size varied as the velocity increased, and the fractured surface showed a form of ductile fracture. It can be concluded from above result that he existence of voids may have been created during the welding process due to the oxides and nitrites phases being formed [15]. Based on…”

“…[10]. One of the major advantages of Laser welding is that, without use of filler materials, can produce a joint.The responsiveness of different materials is also affecte d by broad variations in thermal properties and low metal co mpatibility [11][12][13][14][15]. Laser welding has a distinct advantage like Capability to regulate welding, repeatability and quick autom atic profiling which will control the weld profile with an extremely narrow heat affected area [16][17][18].…”

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

“…The welding heat input is asymmetrical in the thickness of the non-penetration plate, where the solidi cation and phase transformation of the weld bead are not synchronized with the cooling contraction of the partial non-penetrated plate, and the constraint of free expansion and contraction of the weld bead in the non-penetration plate is greater than that of the penetration plate, as a result, the residual stress near the weld fusion line of the non-penetration plate is much higher than that of the penetration plate [21][22][23].…”