Study of CO2 laser welding to suppress the defects in thick steel plates welding bead

Sugihashi, Atsushi; Kido, M.; Kawai, Yasuji; Yano, Yasuhide

doi:10.2351/1.5065605

International Congress on Applications of Lasers &Amp; Electro-Optics 2002

DOI: 10.2351/1.5065605

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Study of CO2 laser welding to suppress the defects in thick steel plates welding bead

Atsushi Sugihashi¹,

M. Kido²,

Yasuji Kawai³

et al.

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2011

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Solidification Cracking Susceptibility in C-Mn Steel CO2 Laser Welds

Gittos

Birch

Pargeter

2011

Hot Cracking Phenomena in Welds III

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IntroductionHigh power CO 2 laser welding of C-Mn steel has been a competitive process for many applications, including shipbuilding and structural steelwork, for many years [1]. There are many advantages, mostly related to precision, quality, ease of automation and cost. One problem which remains unpredictable, and therefore difficult to control, however, is solidification cracking. It is evident that some steels are more susceptible to solidification cracking in autogenous laser welds than others, and this is most likely to be due to differences in chemical composition, although other differences, such as strength, may play a part. It is also evident that process parameters affect the risk of cracking; high travel speeds increase the risk, as demonstrated in earlier work [2,3], and variations in other parameters, particularly focus position which affect weld shape [4], are also relevant. However, welding power been found to be a variable influence on crack sensitivity [3,5].The effects of chemical composition have been explored, using a 10 kW laser in previous work at TWI [2]. In this, it was found that cracking increased as the carbon level fell from about 0.15 to 0.09%, the latter corresponding to the maximum freezing temperature range. It was felt that it would be of interest to explore the effects of carbon content below 0.09%. However, since the time of ref. 2, the 10 kW laser had been de-commissioned and therefore the opportunity was taken in the present work not only to explore the effect of carbon content below 0.09% but also the robustness of equations generated using welds made with the 10 kW laser, on welds made with a different laser (25 kW) over a wider range of compositions. The opportunity has also been taken to investigate the effect of strength on cracking, independent of composition, and also to vary focus position.

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Solidification Cracking Susceptibility in C-Mn Steel CO2 Laser Welds

Gittos

Birch

Pargeter

2011

Hot Cracking Phenomena in Welds III

View full text Add to dashboard Cite

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Study of CO2 laser welding to suppress the defects in thick steel plates welding bead

Cited by 1 publication

References 1 publication

Solidification Cracking Susceptibility in C-Mn Steel CO2 Laser Welds

Solidification Cracking Susceptibility in C-Mn Steel CO2 Laser Welds

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