The effect of shielding gas composition on welding performance and weld properties in hybrid CO2 laser-gas metal arc welding of carbon manganese steel

Anna Fellman, Veli Kujanpää

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Abstract

Metals industries producing large structures currently have a particular interest in hybrid laser welding processes, which possess advantages compared with conventional methods of welding. One major benefit is a reduction in deformation that enables the amount of postweld finishing work to be reduced. Assembly then also becomes simpler because of the greater accuracy that may be achieved. Larger joint tolerances may be accommodated compared with laser welding alone. By using appropriate filler metal, the weld metal composition may be controlled to meet metallurgical criteria. The hybrid CO2 laser–gas metal arc (GMA) welding process was investigated in this study; the aim being to clarify the effects of process gas composition on welding performance, weld cross section, quality, and mechanical properties, when welding carbon manganese steel. Helium, argon, and carbon dioxide were used in varying proportions as shielding gases for welding I-butt and T-butt joints. The composition of the shielding gas was found to affect welding performance, weld quality, and weld cross-section geometry. The best results were obtained by using argon, with a helium content of 40%–50% and a carbon dioxide content of 2%–5%; the exact composition depending on the groove edge quality. Hybrid laser welds of high quality may be produced in carbon manganese steel with a variety of shielding gas compositions, but to maximize productivity, reliability, and quality, while minimizing gas cost, the composition must be selected carefully.
Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalJournal of Laser Applications
Volume18
Issue number1
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

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arc welding
Gas metal arc welding
gas lasers
Steel
gas composition
Manganese
welding
Shielding
shielding
manganese
Welding
Welds
Carbon
Gases
steels
Lasers
carbon
Chemical analysis
laser welding
metals

Cite this

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title = "The effect of shielding gas composition on welding performance and weld properties in hybrid CO2 laser-gas metal arc welding of carbon manganese steel",
abstract = "Metals industries producing large structures currently have a particular interest in hybrid laser welding processes, which possess advantages compared with conventional methods of welding. One major benefit is a reduction in deformation that enables the amount of postweld finishing work to be reduced. Assembly then also becomes simpler because of the greater accuracy that may be achieved. Larger joint tolerances may be accommodated compared with laser welding alone. By using appropriate filler metal, the weld metal composition may be controlled to meet metallurgical criteria. The hybrid CO2 laser–gas metal arc (GMA) welding process was investigated in this study; the aim being to clarify the effects of process gas composition on welding performance, weld cross section, quality, and mechanical properties, when welding carbon manganese steel. Helium, argon, and carbon dioxide were used in varying proportions as shielding gases for welding I-butt and T-butt joints. The composition of the shielding gas was found to affect welding performance, weld quality, and weld cross-section geometry. The best results were obtained by using argon, with a helium content of 40{\%}–50{\%} and a carbon dioxide content of 2{\%}–5{\%}; the exact composition depending on the groove edge quality. Hybrid laser welds of high quality may be produced in carbon manganese steel with a variety of shielding gas compositions, but to maximize productivity, reliability, and quality, while minimizing gas cost, the composition must be selected carefully.",
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The effect of shielding gas composition on welding performance and weld properties in hybrid CO2 laser-gas metal arc welding of carbon manganese steel. / Fellman, Anna; Kujanpää, Veli.

In: Journal of Laser Applications, Vol. 18, No. 1, 2006, p. 12-20.

Research output: Contribution to journalArticleScientificpeer-review

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