Visualization of submerged arc welding phenomena by X-ray observation and direct observation

Hisaya Komen, Yohei Abe, Takahiro Fujimoto, Masaya Shigeta, Mitsuyoshi Nakatani, Manabu Tanaka

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Behaviors of flux, slag and molten metal during a submerged arc welding with a large current were observed by the X-ray observation system including a high speed video camera. Moreover, the direct observation using a high speed video camera was also carried out to observe the arc phenomena, which could not be observed by the X-ray observation. From X-ray observation results, the weld part during a submerged arc welding was classified broadly into 4 regions. Then, it was clarified that a slag was pushed backward in a welding direction when it approached to a wire which an arc plasma existed around. As a result of this series of slag behaviors, the preformed cavity was filled by the slag at the backward of the heat source. In addition, from a direct observation, it was made clear that there were bluish white plasma at beneath a molten metal droplet and orange emitting region around the plasma.

Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Issue number4
Publication statusPublished - 2018


  • Droplet transfer phenomena
  • Submerged arc welding
  • X-ray observation


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