The effect of shielding gas types on CO2 laser tailored blank weldability of low carbon automotive galvanized steel

B. G. Chung, Sehun Rhee, C. H. Lee

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

This study deals with the effects of shielding gas types on CO2 laser weldability of low carbon automotive galvanized steel. The types of shielding gas evaluated are helium, carbon dioxide, argon, nitrogen and 50% argon+50% nitrogen. The weld penetration, strength and formability (Erichsen test) of laser welds are found to be strongly dependent upon the types of shielding gas used. Further, the maximum travel speed and flow rate to form a keyhole weld are also dependent upon types of shielding gas. The ability of shielding gas in removing plasma plume, and thus increasing weld penetration, is believed to be closely related to ionization/dissociation potentials, which determine the period of plasma formation and disappearance. Further, thermal conductivity and reactivity of the gas with the molten pool also have a strong effect on penetration and porosity formation which in turn affect formability and strength.

Original languageEnglish
Pages (from-to)357-362
Number of pages6
JournalMaterials Science and Engineering A
Volume272
Issue number2
DOIs
StatePublished - 1999 Nov 30

Fingerprint

weldability
Weldability
Steel
blanks
Shielding
shielding
Carbon
Gases
steels
Lasers
carbon
Welds
gases
lasers
penetration
Argon
Formability
Nitrogen
argon
Plasmas

Keywords

  • Erichsen test
  • Fracture ratio (FR)
  • Shielding gas
  • Strength ratio (SR)
  • Tailored blank (TB)
  • Weld penetration

Cite this

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abstract = "This study deals with the effects of shielding gas types on CO2 laser weldability of low carbon automotive galvanized steel. The types of shielding gas evaluated are helium, carbon dioxide, argon, nitrogen and 50{\%} argon+50{\%} nitrogen. The weld penetration, strength and formability (Erichsen test) of laser welds are found to be strongly dependent upon the types of shielding gas used. Further, the maximum travel speed and flow rate to form a keyhole weld are also dependent upon types of shielding gas. The ability of shielding gas in removing plasma plume, and thus increasing weld penetration, is believed to be closely related to ionization/dissociation potentials, which determine the period of plasma formation and disappearance. Further, thermal conductivity and reactivity of the gas with the molten pool also have a strong effect on penetration and porosity formation which in turn affect formability and strength.",
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The effect of shielding gas types on CO2 laser tailored blank weldability of low carbon automotive galvanized steel. / Chung, B. G.; Rhee, Sehun; Lee, C. H.

In: Materials Science and Engineering A, Vol. 272, No. 2, 30.11.1999, p. 357-362.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of shielding gas types on CO2 laser tailored blank weldability of low carbon automotive galvanized steel

AU - Chung, B. G.

AU - Rhee, Sehun

AU - Lee, C. H.

PY - 1999/11/30

Y1 - 1999/11/30

N2 - This study deals with the effects of shielding gas types on CO2 laser weldability of low carbon automotive galvanized steel. The types of shielding gas evaluated are helium, carbon dioxide, argon, nitrogen and 50% argon+50% nitrogen. The weld penetration, strength and formability (Erichsen test) of laser welds are found to be strongly dependent upon the types of shielding gas used. Further, the maximum travel speed and flow rate to form a keyhole weld are also dependent upon types of shielding gas. The ability of shielding gas in removing plasma plume, and thus increasing weld penetration, is believed to be closely related to ionization/dissociation potentials, which determine the period of plasma formation and disappearance. Further, thermal conductivity and reactivity of the gas with the molten pool also have a strong effect on penetration and porosity formation which in turn affect formability and strength.

AB - This study deals with the effects of shielding gas types on CO2 laser weldability of low carbon automotive galvanized steel. The types of shielding gas evaluated are helium, carbon dioxide, argon, nitrogen and 50% argon+50% nitrogen. The weld penetration, strength and formability (Erichsen test) of laser welds are found to be strongly dependent upon the types of shielding gas used. Further, the maximum travel speed and flow rate to form a keyhole weld are also dependent upon types of shielding gas. The ability of shielding gas in removing plasma plume, and thus increasing weld penetration, is believed to be closely related to ionization/dissociation potentials, which determine the period of plasma formation and disappearance. Further, thermal conductivity and reactivity of the gas with the molten pool also have a strong effect on penetration and porosity formation which in turn affect formability and strength.

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KW - Fracture ratio (FR)

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KW - Strength ratio (SR)

KW - Tailored blank (TB)

KW - Weld penetration

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