Hybrid laser arc welding of thick high-strength pipeline steels of grade X120 with adapted heat input

Üstündağ, Ömer; Gook, Sergej; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1016/j.jmatprotec.2019.116358

Cited by 39 publications

(14 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This issue was also widely discussed in all the technologies that created narrow weld beads such as laser and electron beam welding. Many of the articles, e.g., [ 21 , 22 ], discussed this problem in detail and it was generally called fracture path deviation (FPD). FPD arose not only in impact tests but also in static three-point bend tests and fracture toughness tests.…”

Section: Resultsmentioning

confidence: 99%

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

et al. 2020

View full text Add to dashboard Cite

Pipeline transport uses millions of kilometers of pipes worldwide to transport liquid or gas over long distances to the point of consumption. High demands are placed, especially on the transport of hazardous substances under high pressure (gas, oil, etc.). Mostly seamless steel pipes of various diameters are used, but their production is expensive. The use of laser-welded pipes could significantly reduce the cost of building new pipelines. However, sufficient mechanical properties need to be ensured for welded pipes to meet stringent requirements. Therefore, laser-welded 10 mm thick pressure vessel steel plates were subjected to various mechanical tests, including high-cycle fatigue tests. Furthermore, the microstructural parameters and the state of residual stresses were determined using X-ray and neutron diffraction, which could affect fatigue life, too. The critical areas for possible crack initialization, especially in and near the heat-affected zone, were found using different tests. The presented results outline the promising application potential of laser welding for the production of pipes for high-pressure pipelines.

show abstract

Section: Resultsmentioning

confidence: 99%

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Moreover, it will cause larger HAZ width [43,44]. Alternative solution is to use higher heat input from either the laser beam [16] or the arc power. However, this may lead to excessive penetration and spattering on the root side with underfill on the top [9].…”

Section: Microstructure and Hardnessmentioning

confidence: 99%

“…However, there is still many unknown factors why and how to avoid this very frequent problem in welding of thick plates. Application of electromagnetic backing can be as a solution [11][12][13][14][15][16]; however, its viability on a full industrial scale (for welds longer than 5-10 m) is of concern.…”

Section: Introductionmentioning

confidence: 99%

Laser-arc hybrid welding of 12- and 15-mm thick structural steel

Bunaziv

Dørum

Nielsen

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

High-power lasers are very effective in welding of plates thicker than 10 mm due to the keyhole mode. High-power intensity generates a vapor-filled cavity which provides substantial penetration depth. Due to the narrow and deep weld geometry, there is susceptibility to high hardness and weld defects. Imperfections occur due to keyhole instability. A 16-kW disk laser was used for single-pass welding of 12-to 15-mm thick plates in a butt joint configuration. Root humping was the main imperfection and persisted within a wide range of process parameters. Added arc source to the laser beam process may cause increased root humping and sagging due to accelerated melt flow. Humping was mitigated by balancing certain arc and other process parameters. It was also found that lower welding speeds (< 1.2 m/min) combined with lower laser beam power (< 13 kW) can be more positive for suppression of humping. Machined edges provided more consistent root quality and integrity compared with plasma cut welded specimens. Higher heat input (> 0.80 kJ/mm) welds provided hardness level below 325 HV. The welded joints had good Charpy toughness at − 50°C (> 50 J) and high tensile strength.

show abstract

“…A remarkable advance for the application of HLAW in the offshore industry is exemplified in the work carried out by Üstündag et al [8], where 15 mm thick pipe segments were welded in 2G position using the defocusing of the laser beam technique. This new discovery avoided crater imperfections at the ends during the closure of the circumferential sleeves, demonstrating the industrial applicability of this welding process [8].…”

Section: Introductionmentioning

confidence: 99%

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque

Sánchez-Amaya

Porrúa-Lara³

et al. 2021

Metals

Self Cite

View full text Add to dashboard Cite

The present contribution is the first research reporting full penetration HLAW joints in 15 mm thick EH36 steel butt T-welds with square grooves on 2F welding position by single-sided welding. The effects of welding parameters were investigated to increase the quality of the joints. Conditions leading to defect-free full penetration welds fulfilling naval regulations includes a laser power of 12.5 kW, a welding speed of 1.6 m/min and the vertical laser offset distance from the flange of 1 mm. Advanced characterization of selected welds included a microstructural identification by optical microscopy, SEM, and XRD, revealing the presence of acicular, polygonal and Widmanstätten ferrite, lath martensite, and some retained austenite at FZ. Hardness and microhardness mapping tests showed values of 155 HV at base metal and 200 to 380 HV at the fusion zone connecting the web to the flange.

show abstract

Hybrid laser arc welding of thick high-strength pipeline steels of grade X120 with adapted heat input

Cited by 39 publications

References 30 publications

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

Laser-arc hybrid welding of 12- and 15-mm thick structural steel

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Contact Info

Product

Resources

About