Metallurgical Investigations of Laser Welding of AISI 304 Stainless Steel

Seiyed Ali Asghar Akbari Mousavi; A. Gharedaghi; Mohammad Mastoori

doi:10.4028/www.scientific.net/MSF.580-582.41

Paper Titles

Comprehensive Analysis for Microstructure Evolution in Welding
p.25

Effect of Post Weld Heat Treatment on the Interface Microstructure of Explosively Welded Titanium/Stainless Steel Composite Clad
p.29

Observation of Nucleation and Growth of Acicular Ferrite in HSLA Steel Weld-Metal
p.33

Analysis of Weld Defects in Offshore Structural H Beams
p.37

Metallurgical Investigations of Laser Welding of AISI 304 Stainless Steel
p.41

Effect of Interstitial Elements on the Toughness of Ferritic Stainless Steel Weld
p.45

Development of Evaluation Method for Solidification Cracking Susceptibility of Inconel600/SUS347 Dissimilar Laser Weld Metal by In-Situ Observation
p.49

Micro Flash Welding of Super Duplex Stainless Steel with Zr Metallic Glass Insert
p.53

Effect of Chemical Composition of Welding Wire and Low Temperature Steel Plate on the Weld Properties Made by SAW
p.57

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Metallurgical Investigations of Laser Welding of AISI 304 Stainless Steel

Abstract:

Laser welding of AISI 304 stainless steel was carried out by pulsed Nd:YAG laser machine under different welding conditions. Geometrical shape of the joints was circular butt. Studies were focused on laser power, welding velocity, beam diameter and pulse duration. Microstructure of welded joints was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). OM and SEM results show no evidence of grain growth in heat affected zone (HAZ). In addition, columnar and equiaxed grains are observed in the weld metal. Various defects such as lack of fusion, underfill, porosity, hot crack and mismatch are observed as a result of improper welding conditions. The best welding conditions to obtain minimum defects are presented.