Solidification cracking susceptibility of modified 9Cr1Mo steel weld metal during hot-wire laser welding with a narrow gap groove

Phaoniam, Rittichai; Shinozaki, Kenji; Yamamoto, Mikio; Kadoi, Kota; Nishijima, Akito; Yamamoto, Masayuki

doi:10.1007/s40194-014-0130-2

Cited by 23 publications

(12 citation statements)

References 9 publications

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“…Narrow gap laser welding (NGLW) is considered as one of the most effective ways to repair the cracks, for its lower heat input, less repairing deformation and better repairing quality, comparing with the conventional electric arc or plasma arc welding method [9][10][11][12]. However, residual stress of NGLW is also a vital factor for repairing quality of cracks and has been one of the research focuses of NGLW [13][14][15]. The aim of this work is to present distributions and evolution of residual stress during multipass NGLW processing.…”

Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 99%

Residual Stress Analysis of Laser Remanufacturing

Dong¹,

Song²,

Xiangyi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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Laser remanufacturing is an advanced repairing method to remanufacture damaged parts based on laser processing, such as laser cladding and laser welding. As a critical factor in determining the remanufacturing quality, residual stress of different laserremanufactured parts was analysed by numerical methods based on deactivating and reactivating element theory, as well as experimental methods such as X-ray diffraction and hole drilling measurements. The distributions and evolution law of residual stress during multipass laser welding of 7A52 high-strength aluminium alloy, and the effects of forming strategy, heat input and solid-state phase transition on residual stress in the laser cladding forming layers of QT 500 cast iron and FV520B high strength steel, were emphatically studied. The simulation results of residual stress fit well with the experimental results, indicating that both residual stress and its accumulation phenomenon would occur during the laser welding and laser cladding forming, and were affected by factors such as welding pass, heat input and phase transition. It is feasible to control residual stress by using cross path forming strategy, less heat input and alloying power materials with low martensite transition point (Ms).

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Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 99%

Residual Stress Analysis of Laser Remanufacturing

Dong¹,

Song²,

Xiangyi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

View full text Add to dashboard Cite

show abstract

“…を制御することが難しいなどの問題点がある (Ojima, 2013, Balasubramanian, et al, 2011 (Wei, et al, 2015, Wen, et al, 2015, Liu, et al, 2014, Fang, et al, 2014, Phaoniam, et al, 2014, Phaoniam, et al, 2013 …”

Section: )．炭酸ガスアーク溶接法は簡便，且つ低コストであるものの，投入熱量が大きく溶接変形が増大すること，また炭酸ガスunclassified

Fatigue properties of the fillet welded joint for non-load carrying type using hot-wire laser welding process

Akebono

Morikawa

Kado³

et al. 2015

Transactions of the JSME (In Japanese)

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In order to investigate the fatigue properties of the fillet welded joint for non-load carrying type using hot-wire laser welding process, fatigue tests were carried out in comparison with the fillet welded joint using CO2 arc welding process to be widely used as a conventional welding method. Furthermore, the welding method to achieve the hot-wire laser welded joints with superior fatigue properties was suggested based on the experimental knowledge on the fatigue properties. It is clear that hot-wire laser welding process can remove the primer coating at steel plate surface during the welding process. From the results of the fatigue tests, CO2 arc welded joints indicated the higher fatigue strength compared with hot-wire laser welded joints because the hardness of HAZ was higher than that of the welded metal in hot-wire laser welded joints whereas the hardness of the welded metal and HAZ indicated the same value in CO2 arc welded joints in the case of using the same welding wire JIS:Z3312YGW11. Therefore, it can be improved the difference of the fatigue strength by selecting the welding wire as to achieve the same hardness in both of the welded metal and HAZ. Furthermore, it can be possible to achieve the hot-wire laser welded joints with higher fatigue strength compared with the CO2 arc welded joints by adjusting the wire feed speed and controlling the weld toe shape. From the experimental results, it was concluded that hot-wire laser welding process can be applied with high safety and reliability as alternative welding process to CO2 arc welding process.

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“…The experimental analysis method to optimize the process parameters is complex, especially take a long time and cost [9][10]. The simulation analysis method is particularly suitable for the NG-GMAW, which can improve efficiency and save cost.…”

Section: Introductionmentioning

confidence: 99%

Parameter Analysis and Optimization of the Rotating Arc NG-GMAW Welding Process

Duan¹,

Wang²,

Lu³

et al. 2018

Int. j. simul. model.

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Parameters of the narrow gap gas metal arc welding (NG-GMAW) method are complex and strongly coupled, which can easily cause welding defects, such as poor sidewall fusion, overlap, gas pore and slag inclusion. So parameter optimization of NG-GMAW is very difficult. The common experimental analysis method is complex, especially take a long time and cost. In this paper, the simulation analysis method is used to analyse NG-GMAW welding process. After the analysis of the NG-GMAW welding mechanism, the dynamic simulation model of the rotating arc NG-GMAW welding process is established firstly. Then, the influence of key process parameters on the welding quality is analysed in detail, which include the rotation angular velocity, rotation angular amplitude, wire feed speed, welding speed, sidewall stay time and so on. The simulation and analysis results illustrate the role and influence of the above parameters. In short, this paper provides a flexible and efficient method for the analysis and optimization of NG-GMAW welding process parameters to discover new phenomena, improve efficiency and save cost.

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Solidification cracking susceptibility of modified 9Cr1Mo steel weld metal during hot-wire laser welding with a narrow gap groove

Cited by 23 publications

References 9 publications

Residual Stress Analysis of Laser Remanufacturing

Residual Stress Analysis of Laser Remanufacturing

Fatigue properties of the fillet welded joint for non-load carrying type using hot-wire laser welding process

Parameter Analysis and Optimization of the Rotating Arc NG-GMAW Welding Process

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