Optimization of underwater wet welding process parameters using neural network

Omajene, Joshua Emuejevoke; Martikainen, Jukka; Wu, Huapeng; Kah, Paul

doi:10.1186/s40712-014-0026-3

Cited by 10 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Requirements for improving the arc stability and weld properties are especially strict. 11 Consequently, the modification of the composition of electrode coatings 12,13 or welding parameters, 14–16 which only requires conventional UWW process, is adopted in most of the previous reports. The water environment is also the source of potential diffusible hydrogen present in deposited metal.…”

Section: Introductionmentioning

confidence: 99%

Correlation between wire feed speed and external mechanical constraint for enhanced process stability in underwater wet flux-cored arc welding

Wang

Sun

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

It is a great challenge to improve the process stability in conventional underwater wet welding due to the formation of unstable bubble. In this study, mechanical constraint method was employed to interfere the bubble generated by underwater wet welding, and the new method was named as mechanical constraint assisted underwater wet welding. The aim of the study was to quantify the combined effect of wire feed speed and condition of mechanical constraint on the process stability in mechanical constraint assisted underwater wet welding. Experimental results demonstrated that the introduction of mechanical constraint not only suppressed the bubble without floating but also stabilized the arc burning process. The degree of influence of mechanical constraint, which changed with wire feed speed, played an important role during the mechanical constraint assisted underwater wet welding process. For all wire feed speeds, the fluctuations of welding electrical signal were decreased through introduction of mechanical constraint. The difference in the proportion of arc extinction process between underwater wet welding and mechanical constraint assisted underwater wet welding became less with increasing wire feed speed. At wire feed speed lower than 7.5 m/min, the improvement of process stability was very significant by mechanical constraint. However, the further improvement produced limited effect when the wire feed speed was greater than 7.5 m/min. The observation results showed that a better weld appearance was afforded at a large wire feed speed, corresponding to a lower variation coefficient.

show abstract

Section: Introductionmentioning

confidence: 99%

Correlation between wire feed speed and external mechanical constraint for enhanced process stability in underwater wet flux-cored arc welding

Wang

Sun

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…The water environment intensifies the welding process problems. The following aspects may be considered the most important steel weldability limiting factors in wet welding [1,2,[7][8][9][10][11]: -rapid cooling rate caused by accelerated heat abstraction from the arc external zone and the weld area. This leads to formation of brittle hardened structures.…”

Section: Introductionmentioning

confidence: 99%

Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Fydrych

Łabanowski

Tomków

2015

Advances in Materials Science

View full text Add to dashboard Cite

Water as the welding environment determines some essential problems influencing steel weldability. Underwater welding of high strength steel joints causes increase susceptibility to cold cracking, which is an effect of much faster heat transfer from the weld area and presence of diffusible hydrogen causing increased metal fragility. The paper evaluates the susceptibility to cold cracking of the high strength S355G10+N steel used, among others, for ocean engineering and hydrotechnical structures, which require underwater welding. It has been found from the CTS test results that the investigated steel is susceptible to cold cracking in the wet welding process.

show abstract