An investigation on stability of laser hybrid arc welding

Moradi, Mahmoud; Ghoreishi, M.; Frostevarg, Jan; Kaplan, Alexander

doi:10.1016/j.optlaseng.2012.10.016

Cited by 78 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By this assumption, the distribution of energy in the plasma region follows Maxwell's equation [18]. The LTE assumption can be satisfied due to sufficiently high electron density [19]:…”

Section: Resultsmentioning

confidence: 99%

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Liu

et al. 2019

Materials

View full text Add to dashboard Cite

Hybrid laser-double-arc welding (HLDAW) is an efficient welding method with multi-heat sources comprised of two arcs and a laser beam, which is an intricate process with much randomness and uncertainty due to the mutual effect between multi-plasmas. Compared with double-arc welding (DAW), HLDAW can generally obtain a more stable welding process and deeper weld penetration, which is directly affected by the synergistic effect of multiple heat sources; however, the mechanism has not been systematically studied. In this study, the multi-information analysis method is adopted to study the distribution of electron temperatures, electron densities and electrical conductivity of double-arc welding (DAW) and HLDAW by utilizing synchronous radiation spectrum, high-speed photography and electrical signal sensing technology. The results indicated that the high concentration of charged particles provided a conductive channel for the two arcs to achieve a more stable welding process in HLDAW. The synergy between the laser and the arc changed the flow mode of the weld pool, which facilitated the molten metal flowing toward the bottom of the molten pool. Obtaining the same melting depth, the line energy input of HLDAW was 13% lower than that of DAW; the heat affected zone is narrower and the grain size is smaller. The weld penetration depth was improved in HLDAW, which was 1.8 times that of DAW and 1.5 times that of pure laser welding under the laser power of 1.5 kW. The weld penetration of HLDAW increased with laser power.

show abstract

“…By this assumption, the distribution of energy in the plasma region follows Maxwell's equation [18]. The LTE assumption can be satisfied due to sufficiently high electron density [19]:…”

Section: Resultsmentioning

confidence: 99%

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Liu

et al. 2019

Materials

View full text Add to dashboard Cite

show abstract

“…Several experimental studies [22,23,6,24,7,12,5] have firmly proved the advantages of hybrid welding process. However, very few numerical studies are carried out on the hybrid welding process.…”

Section: Introductionmentioning

confidence: 92%

Numerical modeling of heat transfer and fluid flow in hybrid laser–TIG welding of aluminum alloy AA6082

Faraji

Goodarzi

Seyedein

et al. 2014

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This paper describes a three-dimensional numerical model based on finite volume method to simulate heat transfer and fluid flow in laser-tungsten inert gas (TIG) hybrid welding process. To simplify the model and reduce the calculation time, keyhole dynamics are not considered; instead, a new modified volumetric heat source model is presented for the laser source to take into account the effect of the keyhole on the heat transfer into the workpiece. Due to the presence of arc current, an appropriate electromagnetic model based on the Maxwell equations are also solved to calculate electromagnetic forces in the weld pool. The results of computer simulation, including temperature, current density, electromagnetic, and melted material velocity field, are presented here. Furthermore, several dimensionless numbers are employed to recognize the importance of fluid flow driving forces in the weld pool. It is deduced that the fluid flow has an important effect on the weld pool shape. It is also founded that among the driving forces, Marangoni force is dominant fluid force in the weld pool. Besides, calculated results of hybrid welding process are compared with those of TIG and laser welding processes. The weld pool depth is relatively the same, but the width of the weld pool is highly larger in hybrid welding than lone laser welding. Eventually, the presented model is validated by comparison between calculated and experimental weld pool shape. It is founded that there is a good agreement as the capability of this model can be proved.

show abstract

“…The effect of laser-arc interaction on the droplet was considered. Before impinging onto the base metal, the droplet was driven by gravity F g , electromagnetic force F em , surface tension F γ , plasma arc drag force F P , and metal vapor reaction force F RL [27][28][29][30]. Under the influence of these forces, the droplet was accelerated and impinged the molten pool at a certain velocity.…”

Section: Description Of the Dropletmentioning

confidence: 99%

Effect of droplet impact on molten pool dynamics in hybrid laser-MIG welding of aluminum alloy

Chen

et al. 2018

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In order to investigate the effect of droplet impact on molten pool dynamics in hybrid laser-MIG (metal inert gas) welding, a three-dimensional mathematical model was developed, and a new approach to simulate the droplet impact was proposed. In the model, the droplet heat and impact under the influence of laser was considered, and the deformation of molten pool was calculated with considering droplet impact and arc pressure. To simplify the model, a modified body heat source model was presented for laser source to take into account multiple reflections and Fresnel absorption. Surface tension, electromagnetic force, and buoyancy were considered to calculate the fluid flow pattern. Furthermore, several dimensionless numbers were used to recognize the importance of the driving forces in molten pool. It was found that molten pool dynamics and final weld bead geometry were strongly affected by the droplet impact. To demonstrate the importance of droplet impact, the temperature, velocity distribution, and the deformation of molten pool were analyzed and compared under different conditions. With considering droplet impact, the penetration was bigger, and the width was smaller. Furthermore, the simulated weld bead geometry was in good agreement with experimental measurement.

show abstract

An investigation on stability of laser hybrid arc welding

Cited by 78 publications

References 14 publications

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Numerical modeling of heat transfer and fluid flow in hybrid laser–TIG welding of aluminum alloy AA6082

Effect of droplet impact on molten pool dynamics in hybrid laser-MIG welding of aluminum alloy

Contact Info

Product

Resources

About