The influence of pre-heat treatment on laser welding of T-joints of workpieces made of selective laser melting steel and cold rolled stainless steel

•Welded joints of SLM and CR stainless steels were produced by laser welding.•A comparison of keyhole and heat conduction laser welding was performed.•The influence of pre-heat treatment on the strength and weldability was revealed.•The hardness of welding seams produced by head conduction is 500 HV...

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Bibliographic Details
Published in:Optics and laser technology 2018-11, Vol.107, p.59-66
Main Author: Kuryntsev, S.V.
Format: Article
Language:English
Subjects:
Cold rolled
Cold rolling
Cold welding
Heat treating
Heat treatment
Laser beam melting
Laser beam welding
Laser welding
Lasers
Mechanical properties
Mechanical tests
Microhardness
Microstructure
Residual stress
Selective laser melting
Stainless steel
Stainless steels
Tee joints
Welded joints
Welding
Workpieces
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Summary:•Welded joints of SLM and CR stainless steels were produced by laser welding.•A comparison of keyhole and heat conduction laser welding was performed.•The influence of pre-heat treatment on the strength and weldability was revealed.•The hardness of welding seams produced by head conduction is 500 HV, by keyhole – 280 HV.•The welded joints strength is comparable to the SLM metal strength (1450 MPa). The details produced by additive manufacturing have limitations in sizes, if you produce large details then there are large residual stresses. It is also economically advantageous to produce complexly configured details by additive manufacturing and then weld them to rolled or wrought cheaper details. The aim of this study is to investigate the influence of pre-heat treatment on laser beam weldability of Selective Laser Welding (SLM) stainless steel to Cold Rolled (CR) stainless steel. The results of metallographic studies and mechanical tests of produced welds are presented. The results showed that the pre-heat treatment of SLM workpieces affects the welded joint strength. The laser welding mode, keyhole or conduction, affected the microstructure and microhardness of the welds.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.05.031