Helium-tight Laser Beam Welding of Aluminum with Brillant Laser Beam Radiation

Heinen, Paul; Wu, Hao; Olowinsky, Alexander; Gillner, Arnold

doi:10.1016/j.phpro.2014.08.043

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…In heat conduction laser welding, the laser beam is applied to the surface of the material causing it to melt. However, this method is not suited to thin-walled pipes as it can damage the walls [34]. The other type of laser welding is deep penetration welding which is more commonly used for thin-walled pipes.…”

Section: Fusion Weldingmentioning

confidence: 99%

“…This approach is based on using a laser to heat a material above its evaporation point, in order to produce a keyhole in which the laser beam is reflected many times to heat the material. This enables faster welding and deeper penetration than other welding methods for tubes [35]; however, there is a higher risk of defects such as porosity, where evaporated gases in the keyhole degas upon cooling [34]. A recent study by Zhang et al [36] has highlighted that this type of porosity is currently the major barrier which needs to be overcome to increase use of this approach in joining thin-walled pipes.…”

Section: Fusion Weldingmentioning

confidence: 99%

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Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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Small diameter thin-walled pipes, typically with a diameter less than 20 mm and a ratio of outer diameter to wall thickness is 20 or above, have increasingly become a key value adding factor for a number of industries including medical applications, electronics and chemical industries. In high-energy physics experiments, thin-walled pipes are needed in tracking detector cooling systems where the mass of all components needs to be minimised for physics measurement reasons. The pipework must reliably withstand the cooling fluid operation pressures (of up to 100 bar), but must also be able to be reliably and easily joined within the cooling system. Suitable standard and/or commercial solutions combining the needed low mass and reliable high-pressure operation are poorly available. The following review of literature compares the various techniques that exist for the manufacture and joining of thin-walled pipes, both well-established techniques and novel methods which have potential to increase the use of thin-walled pipes within industrial cooling systems. Gaps in knowledge have been identified, along with further research directions. Operational challenges and key considerations which have to be identified when designing a system which uses thin-walled pipes are also discussed.

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Section: Fusion Weldingmentioning

confidence: 99%

Section: Fusion Weldingmentioning

confidence: 99%

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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show abstract

“…For example, a hermetic seal is required for lithium-ion cell casings and they are laser-welded with uncoated materials such as aluminum and stainless steel [17]. While unfavorable process parameters can lead to defects such as cracks and pores in aluminum casings [18], which affect the tightness, gas-tight sealing of 316 L casings can be easily achieved [16]. Equivalent studies on laser welding of zinc-coated steel sheets made of high-strength steel grades could not be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

On Welding of High-Strength Steels Using Laser Beam Welding and Resistance Spot Weld Bonding with Emphasis on Seam Leak Tightness

Schmolke

Brunner-Schwer

Biegler

et al. 2023

JMMP

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The design of most electric vehicles provides for the positioning of the heavy energy storage units in the underbody of the cars. In addition to crash safety, the battery housing has to meet high requirements for gas tightness. In order to test the use of high-strength steels for this sub-assembly, this paper examines welded joints utilizing resistance spot weld bonding and laser remote welding, with special regard to the gas tightness of the welds. For this purpose, the pressure difference test and helium sniffer leak detection are presented and applied. The combination of both leak test methods has proven ideal in experimental investigations. For laser remote welding, gas-tight seams can be achieved with an inter-sheet gap of 0.1 mm, even if occasionally leaking samples cannot be prevented. Resistance spot welding suits gas-tight joining with both one- and two-component adhesives. Against the background of leak tightness, process fluctuations that lead to weld spatter and defects in the adhesive layer must be prevented with high priority.

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“…This can lead back to instabilities in the keyhole-like constriction and collapse. Furthermore, porosity can be caused by the evaporation of solved gases in the liquid titanium which degas during cooling [36]. Torkamany et al showed that weld porosity was formed in the pulsed laser welded joints of pure Ti [37].…”

Section: Introductionmentioning

confidence: 99%

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

Vyskoč¹,

Dománková²,

Sahul³

et al. 2020

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The paper deals with the evaluation of the shielding gas influence on the properties of titanium Grade 2 weld joints produced with disk laser. Butt weld joints were produced under different shielding gas types, namely Ar, He, Ar + 5 vol.% He, Ar + 30 vol.% He, and without shielding weld pool. Light and electron microscopy, microhardness measurements, computed tomography, and tensile testing were used for evaluation of weld joint properties. He-shielded weld joints were the narrowest ones. On the other hand, Ar-shielded weld joints exhibited the largest weld width. The choice of shielding gas had a significant influence on the porosity of welds. The lowest porosity was observed in the weld joint produced in Ar with the addition of 30 vol.% He shielding atmosphere (only 0.03 %), while the highest level of porosity was detected in weld joint produced without shielding gas (0.76 %). Except for unshielded titanium Grade 2 weld joint, the lowest tensile strength was recorded in Ar-shielded weld joints. On the contrary, the highest average microhardness, except unshielded weld joint, was measured in He-shielded weld joints.

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Helium-tight Laser Beam Welding of Aluminum with Brillant Laser Beam Radiation

Cited by 9 publications

References 2 publications

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

On Welding of High-Strength Steels Using Laser Beam Welding and Resistance Spot Weld Bonding with Emphasis on Seam Leak Tightness

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

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