A Study on Cross-Shaped Structure of Invar Material Using Cold Wire Laser Fillet Welding (PART I: Feasibility Study for Weldability)

Kim, Du-Song; Pyo, Changmin; Kim, Jae-Woong; Kim, Jisun; Lee, Hee-Keun

doi:10.3390/met10101385

Cited by 8 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Residual stresses were measured in white and grey cast irons after the cooling-down stage in thermal experiments [22]. There were several attempts to research the mechanism of thermal expansion in metals, focusing on white and grey cast irons [22], Invar [23], and copper-based amorphous alloys [24], as well as in ceramic-metal composites [25], but not enough information is available about CGI. Additionally, it was found that under multiple thermal cycles, the performance of cast iron was significantly influenced by longer-term thermal exposure [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Cao

Baxevanakis

Silberschmidt

2023

Metals

View full text Add to dashboard Cite

Compacted graphite iron (CGI) has gained significant attention in automotive industry applications thanks to its superior thermomechanical properties and competitive price. Its main fracture mechanism at the microscale—interfacial damage and debonding between graphite inclusions and a metallic matrix—can happen under high-temperature service conditions as a result of a mismatch in the coefficients of thermal expansion between the two phases of CGI. Macroscopic fracture in cast iron components can be initiated by interfacial damage at the microscale under thermomechanical load. This phenomenon was investigated in various composites but still lacks information for CGI, with its complex morphology of graphite inclusions. This research focuses on the effect of this morphology on the thermomechanical performance of CGI under high temperatures. A set of three-dimensional finite-element models was created, with a unit cell containing a single graphite inclusion embedded in a cubic domain of the metallic matrix. Elastoplastic behaviour was assumed for both phases in numerical simulations. The effect of graphite morphology on the thermomechanical performance of CGI was investigated for pure thermal loading, focusing on a high-temperature response of its constituents. The results can provide a deeper understanding of the correlation between graphite morphology and CGI fracture mechanisms under high temperatures.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Cao

Baxevanakis

Silberschmidt

2023

Metals

View full text Add to dashboard Cite

show abstract

“…Tayebi et al compared the mechanical properties after performing tungsten inert gas (TIG) welding and Nd:YAG laser welding tests for STS304L and STS316 materials [16]. Kim et al applied the cross-shaped structure of the Invar material to the LNG tank structure derived through the cold wire laser welding (CWLW) process [17]. Khan et al studied the alloying element loss and microstructure deformation of high-Mn austenitic stainless steels according to the type of laser welding, welding speed, laser power, and shielding gas flow rate [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

Kim

Lee

Seong

et al. 2021

JMSE

Self Cite

View full text Add to dashboard Cite

The International Maritime Organization has recently updated the ship emission standards to reduce atmospheric contamination. One technique for reducing emissions involves using liquefied natural gas (LNG). The tanks used for the transport and storage of LNG must have very low thermal expansion and high cryogenic toughness. For excellent cryogenic properties, high-Mn steel with a complete austenitic structure is used to design these tanks. We aim to determine the optimum welding conditions for performing Laser-MIG (Metal Inert Gas) hybrid welding through the MIG leading and laser following processes. A welding speed of 100 cm/min was used for welding a 15 mm thick high-Mn steel plate. The welding performance was evaluated through mechanical property tests (tensile and yield strength, low-temperature impact, hardness) of the welded joints after performing the experiment. As a result, it was confirmed that the tensile strength was slightly less than 818.4 MPa, and the yield strength was 30% higher than base material. The low-temperature impact values were equal to or greater than 58 J at all locations in the weld zone. The hardness test confirmed that the hardness did not exceed 292 HV. The results of this study indicate that it is possible to use laser-MIG hybrid welding on thick high-Mn steel plates.

show abstract

“…Kim et al applied fiber laser welding using cold wire to a cross-shaped Invar of 1.5 mm and 3.0 mm thickness. By optimizing the welding conditions for the cross-shaped structure, which previously required 4 welding passes, the number of passes was reduced to 2 [21].…”

Section: Introductionmentioning

confidence: 99%

A Study on Lap Joint Welding of Thin Plate ASTM F1684 Using Fiber Laser Welding

Kim

et al. 2021

Processes

Self Cite

View full text Add to dashboard Cite

The International Maritime Organization (IMO) has developed stricter regulations on emission standards for sulfur oxides, etc., and the demand for Liquefied Natural Gas (LNG) is increasing as an alternative to satisfy these standards. This study relates to fiber laser welding, an approach which offers high-speed welding and low welding deformation for ASTM F1684, which has a low coefficient of thermal expansion (CTE) even in a cryogenic environment. In this study, through three preliminary experiments using 0.25 mm thick Invar, the conditions required to secure sufficient penetration depth and back bead were identified. Through the cross-sectional observation analysis, the welding conditions without defects were identified and the trend of penetration shape according to increasing welding speed was identified. Following a lap joint laser welding experiment under the secured conditions, the mechanical properties were evaluated through the shear strength test and the heat influence range of a fiber laser was identified through the temperature measurement of a welding part. As a result, it was confirmed that the shear strength of the lap joint laser welding part was 86.8% that of the base metal.

show abstract

A Study on Cross-Shaped Structure of Invar Material Using Cold Wire Laser Fillet Welding (PART I: Feasibility Study for Weldability)

Cited by 8 publications

References 15 publications

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Effect of Graphite Morphology on the Thermomechanical Performance of Compacted Graphite Iron

Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

A Study on Lap Joint Welding of Thin Plate ASTM F1684 Using Fiber Laser Welding

Contact Info

Product

Resources

About