Weld metal structure control efficiency in underwater welding conditions by applying an external electromagnetic field

The experimental works to assess the influence of the external electromagnetic effects on the microstructure of the weld metal made under water are performed. It is shown that in contrast to the standard technology refinement of the microstructure takes place with weaker heterogeneity in crystallization layers. This effect is due to the regular melting of the solidifying metal at the solidification front through a periodic admission of superheated melt from the arc burning zone at a frequency of an external magnetic field reversal.