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Laser welding of grey cast iron with spheroidal graphite-influence of process parameters on crack formationand hardness

Sommer, Niklas
Lehto, John Michael
Völkers, Stefan
Böhm, Stefan

In the investigation at hand, sheets of ferritic and pearlitic grey cast iron with spheroidalgraphite are welded using a fiber-laser. The influence of varying laser power and welding speed onthe macroscopic characteristics of the weld seam and crack formation are analyzed and discussed.Substantial crack formation with crack densities of up to2.93 cm−1are found. Furthermore, hardnessmeasurements are conducted to evaluate the formation of brittle phases within the weld metaland heat-affected zone. Peak hardness values of up to 860 HV0.3 and 975 HV0.3 are identified inEN-GJS-400-15 and EN-GJS-700-2, respectively. Subsequently, a proposition on the dependence ofcrack formation on weld seam width is given. Furthermore, the influence of nickel-containing fillermaterial on the microstructure, crack formation and hardness is studied. It can be derived from theresults that laser-beam welding of grey cast iron with spheroidal graphite requires further research inorder to achieve crack-free weld seams and hinder the formation of undesirable, brittle phases.

Sponsor
Gefördert durch den Publikationsfonds der Universität Kassel
Citation
In: Metals Volume 11 / Issue 4 (2021-03-24) , S. ; EISSN 2075-4701
Collections
@article{doi:10.17170/kobra-202104193703,
  author    ={Sommer, Niklas and Lehto, John Michael and Völkers, Stefan and Böhm, Stefan},
  title    ={Laser welding of grey cast iron with spheroidal graphite-influence of process parameters on crack formationand hardness},
  keywords ={620 and Laserschweißen and Mechanische Eigenschaft and Rissbildung and Mikrostruktur},
  copyright  ={http://creativecommons.org/licenses/by/4.0/},
  language ={en},
  journal  ={Metals},
  year   ={2021-03-24}
}