Laser-Arc Processes and Their Applications in Welding and Material Treatment

Seyffarth, P; Krivtsun, I.V.

doi:10.1201/9781482264821

Cited by 63 publications

(71 citation statements)

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“…As a result, the energy, used for metal melting in hybrid welding, can more than 2 times exceed the sum of the respective energies in welding by each of the heat sources taken separately [1]. Physical factors causing such a synergetic effect are still undisclosed, and should be studied with application of mathematical modeling methods.…”

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

“…In this case, intensive evaporation of metal from weld pool surface occurs under the impact of high-energy density source of laser heating, which has a significant influence of the compo-sition, thermal, gas-dynamic and electromagnetic properties of arc plasma and, consequently, leads to a change of its thermal and dynamic interaction with the metal being welded. At application of CO 2 -lasers (λ = 10.6 μm) in hybrid processes both the interaction mechanisms turn out to be significant, namely, laser radiation absorption in arc column plasma (κ ω ~ 100 m -1 [1]) and metal evaporation from melt surface under the impact of focused laser beam.…”

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

“…This is associated with a strong dependence of the coefficient of volume absorption of laser radiation in arc plasma κ ω on its wave length. At application of shortwave radiation of solid-body or fiber-optic lasers (λ ≈ 1 μm) in the hybrid process, laser beam absorption in arc plasma is insignificant (κ ω ~ 1 m -1 [1]). In this case, intensive evaporation of metal from weld pool surface occurs under the impact of high-energy density source of laser heating, which has a significant influence of the compo-sition, thermal, gas-dynamic and electromagnetic properties of arc plasma and, consequently, leads to a change of its thermal and dynamic interaction with the metal being welded.…”

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

“…At practical implementation of hybrid welding processes a consumableelectrode arc is the most often used (laser + MIG/MAG) [2]. On the other hand, of considerable practical interest are hybrid processes, based on a nonconsumable-electrode arc (laser + TIG), as well as plasma arc (laser + plasma) [1].…”

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

“…Hybrid laser-arc processes performed by simultaneous action of a focused laser beam and electric arc on the item being welded (within a common heating zone) have become widely accepted over the last decades [1,2]. At practical implementation of hybrid welding processes a consumableelectrode arc is the most often used (laser + MIG/MAG) [2].…”

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

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Interaction of CO<sub>2</sub>-laser radiation beam with electric arc plasma in hybrid (Laser + TIG) welding

Krivtsun¹,

Krikent²,

Demchenko³

et al. 2015

The Paton Welding J.

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Self-consistent mathematical model was proposed for the processes of energy-, mass-and charge transfer in the plasma of the column and anode region of electric arc with refractory cathode, running in inert gas, and exposed to a focused beam of CO2-laser radiation, propagating along the arc column. Mathematical description of the processes running in such a system uses single-temperature model of arc plasma, allowing for additional plasma heating due to laser radiation absorption, as well as its multicomponent nature, associated with metal evaporation from cathode surface. Influence of laser beam power and anode surface temperature on thermal and electromagnetic characteristics of plasma of the column and anode region of argon arc on refractory cathode was analyzed. It is shown that as a result of additional local heating of arc plasma by laser radiation, its temperature in the paraxial zone of arc column can rise by 5000-10000 K, compared to the respective arc in TIG welding. This leads to an essential restructuring of spatial distributions of electric potential and density of electric current in the arc column near-anode region, as well as density of thermal flow applied by the arc to the anode, thus changing the distributed and integral characteristics of its thermal and dynamic impact on the metal being welded. It is established that the impact of a focused laser beam on arc plasma leads to the effect of electric current contraction in the center of the region of anode binding of the arc and respective increase of the density of heat flow, applied by the arc to the anode, in hybrid (CO2-laser + TIG) welding. This promotes an increase of the energy applied to the metal, which is consumed in its melting and, therefore, an increase of penetrability of laser-arc heat source. It is shown that anode metal evaporation leads to a certain weakening of the effect of electric current contraction in the arc near-anode region, which is exposed to a focused laser beam. The influence of laser radiation absorption and refraction in arc plasma on the characteristics of laser beam interacting with it and its thermal impact on the surface of metal being welded under the conditions of hybrid (CO2-laser + TIG) welding was studied. It is shown that laser beam absorption in arc plasma leads to a certain decrease of radiation power, reaching the anode surface. The size of beam focusing spot on the above surface practically does not change, i.e. beam refraction in arc plasma turns out to be insignificant. 11 Ref.,

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Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

Section: Abstract : Hybrid (Co2-laser + Tig) Welding Electricmentioning

confidence: 99%

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