[Kovove materialy - Metallic materials]
    Wed - May 23, 2018 - 20:43 No. of hits : 929412 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 56 (2018), Issue 2

Investigation of microstructure and mechanical properties of titanium alloy sheet using low power Nd-YAG laser welding process
KUMAR, U., GOPE, D. K., KUMAR, R., CHATTOPADHYAYA, S., DAS, A. K., PRAMANIK, A., KROLCZYK, G.
vol. 56 (2018), no. 2, pp. 121 - 129

Abstract
In the present investigation, welding of 1 mm thick Ti-6Al-4V sheet has been done by Pulsed Wave (PW) Nd-YAG laser with a variation of laser power from 100 to 400 W and welding speed from 4 to 6 mm s-1. The microstructure and microhardness of the fusion zone indicate that the finely serrated and regular plate-shaped microstructures and the resultant hardness in the welds are the key factors behind the enhanced tensile strength of all joints. The weld bead size increases with decreasing welding speed and vice versa. The hardness increases around the heat affected zone as compared to that of the parent metal, and it is the maximum at the centre of the welded region. In the investigation, the tensile strength of specimen with different process parameters has been found to be approximately equal to the tensile strength of the parent metal. In XRD analysis, the weld zone has been found to consist of 78 % α and 22 % β peaks where two β-titanium peaks (bcc) 100 occur at 39.5110° and 56.9120°.

Key words
microstructure, microhardness, pulsed wave laser, tensile strength

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2018-05-11 12:03      
Articles in press revised: 2017-11-14 12:19     
Full text pdf uploaded: 2018-05-11 11:59    
Information updated: 2017-12-23 08:33   
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