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.
Highlights
In recent days, the nuclear, chemical and petroleum industries use duplex stainless steels (DSS) extensively for heat exchangers construction [1]
The weld zone is affected more by heat, and the distortion is highest in the weld region
4 Conclusions Based on the experiments conducted on laser welded specimens made by DSS type 2205, the following conclusions are drawn: (1) The distortion of a welded specimen varies with cooling rate
Summary
The nuclear, chemical and petroleum industries use duplex stainless steels (DSS) extensively for heat exchangers construction [1]. The reason for this is the better and desirable properties of duplex steels as compared to ferritic or austenitic steels. Heat exchangers take part in a key role in the efficiency and the effectiveness of the entire system. The manufacturing processes welding involved in the making of heat exchangers often plays a great role in their working. The structure of DSS 2205 has austenite phases bounded by a ferrite phase. The benefit of a duplex composition is that it mingles the favorable merits of a ferritic
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