Information-Related Applications of Lasers

Ready, John F.

doi:10.1016/b978-0-12-583960-0.50027-7

Cited by 5 publications

(6 citation statements)

References 86 publications

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“…In the welding process, the main fraction of heat provided by the heat sources, named melting energy in the present paper, is actually used to melt the base metal, and the melting energy can be expressed as20 where E m is the melting energy, νS is the melted volume of metal per unit of time (melted volume), S is the area of the weld cross-section that is shown in Fig. 7, ν is the welding speed, ρ is the density, T is the temperature, T m is the temperature of the melting point, T 0 is the ambient temperature, H is the latent heat of melting and c is the specific heat capacity.…”

Section: Resultsmentioning

confidence: 99%

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Liu

Yuan

2012

Science and Technology of Welding and Joining

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The laser leading hybrid welding mode [laser tungsten inert gas (laser-TIG)] and TIG leading hybrid welding mode (TIG-laser) were utilised in the magnesium alloy welding process. The effects of TIG arc current and the distance between laser beam and TIG electrode (Dla) on penetration depth and melting efficiency in different hybrid welding modes were investigated. Results reveal that there is a decided difference in variation trend of penetration depth with Dla in different welding modes. The penetration depth increases first and then decreases with the Dla increasing from 1 to 7 mm in TIG-laser hybrid welding mode while the penetration depth decreases monotonously with Dla in laser-TIG hybrid welding mode. The increase percentage of melting efficiency remains at ,20% in laser-TIG hybrid welding mode while the increase percentage fluctuates acutely and achieves the maximal value (,53?14%) at the arc current of 120 A in TIG-laser hybrid welding mode.

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Section: Resultsmentioning

confidence: 99%

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Liu

Yuan

2012

Science and Technology of Welding and Joining

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“…Besides the assumptions above, D LA was generally chosen within 1-3 mm in practical hybrid welding. 2,[12][13][14][15][16][17] Then, the proportion of different mechanisms was mainly investigated in this range and the results were shown in Table 1. Here, y presented the whole effect of the two mechanisms, g and h were defined as the proportion of the preheating mechanism and the two plasmas interaction on the whole effect respectively.…”

Section: Role Of Different Mechanisms In Two Heat Sources Interactionmentioning

confidence: 99%

Effects of welding parameters on melting energy of CO₂ laser–GMA hybrid welding

Gao¹,

Zeng²,

Hu³

2006

Science and Technology of Welding and Joining

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A series of CO 2 laser-gas metal arc (GMA) hybrid welding experiments were carried out on the mild steel workpiece to investigate the effects of the welding parameters, such as laser power, arc current and the distance between laser and arc D LA , on the melting energy. A dimensionless parameter y was introduced to indicate the change in the melting energy of hybrid welding. The results showed that with different welding parameters, the melting energy of hybrid welding was changed by the two heat sources (laser and arc) interaction. With an optimal combination welding parameters, y can be increased up to 23%. Finally, the role of the two different mechanisms in the heat sources interaction was quantitatively discussed in terms of y. It can be concluded that when D LA ,4 mm, the interaction between the laser induced plasma and the arc plasma dominates the heat sources interaction, therefore the changes of melting energy, whereas the heat sources interaction is only dominated by the preheating mechanism when D LA >4 mm.

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“…For CO 2 and solid-state lasers, this is usually achieved through optical pumping. 6 Flash lamps are used as a source of light, absorbed by the active medium to raise electrons to the higher energy level.…”

Section: Laser Drillingmentioning

confidence: 99%

“…A wide range of materials can be laser drilled as the hardness of the material does not matter and the electrical conductivity is not a concern. 6 ECM has been replaced in recent years as a result of the environmental effects related to the electrolyte solution. Laser drilling has an economic advantage over EDM in terms of tool wear and expense of the consumables (Table 2).…”

Section: Laser Drillingmentioning

confidence: 99%

Laser drilling of cooling holes in aeroengines: state of the art and future challenges

McNally¹,

Folkes²,

Pashby³

2004

Materials Science and Technology

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Advances in the efficiency of the aeroengine have led to an increase in combustion and exhaust gas temperatures. Although superalloys have been developed to withstand these high temperatures, additional cooling of the components is often necessary. This is achieved through thousands of closely spaced cooling holes drilled into the components. Laser drilling offers economical advantages over other non-conventional drilling techniques (e.g. electrical discharge machining). The key limitations and the areas requiring further investigation to develop the laser drilling process to meet future aeroengine requirements have been identified. Principal areas include the development and investigation of laser barrier methods when drilling through increasingly complicated and smaller cavities, the successful drilling of lower angled effusion holes and the increased use of laser drilling to produce the cooling holes in rotating components. More recent designs of the aeroengine have incorporated thermal barrier coatings, sprayed onto the components to further protect against high temperatures. Successful laser drilling through these coatings, with particular attention to preventing spalling of the coatings also requires more research. Each of these areas will need to be addressed while, at the same time, decreasing the overall drilling times.MST/6162

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Information-Related Applications of Lasers

Cited by 5 publications

References 86 publications

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Effects of welding parameters on melting energy of CO₂ laser–GMA hybrid welding

Laser drilling of cooling holes in aeroengines: state of the art and future challenges

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Information-Related Applications of Lasers

Cited by 5 publications

References 86 publications

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Effect of relative location of laser beam and TIG arc in different hybrid welding modes

Effects of welding parameters on melting energy of CO2 laser–GMA hybrid welding

Laser drilling of cooling holes in aeroengines: state of the art and future challenges

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Product

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Effects of welding parameters on melting energy of CO₂ laser–GMA hybrid welding