Electric arc surfacing using ribbon electrode with magnetic control
DOI:
https://doi.org/10.31498/2225-6733.38.2019.181370Keywords:
electric arc surfacing, converter, ribbon electrode, surfacing quality, welding arcAbstract
Increasing the productivity of the arc surfacing process with a ribbon electrode can be achieved by increasing the width of the electrode. However, as the width of the electrode increases, the likelihood of weld defects forming is increased. This is due to the dispersion of the thermal influence of the arc on the base metal; increasing the size of the weld pool; the occurrence of a magnetic blast effect, because of which the displacement of weld pool liquid metal is possible; the appearance of cuts, irregularities of the edges of the deposited metal. By taking control over the movement of the welding arc at the end of the ribbon electrode, thereby stabilizing the melting of the base metal, it is possible to use the magnetic control of the arc movement at the end of the electrode and eliminate the effect of «magnetic blast». In the presented article, the possibility of controlling the process of moving the arc along the end of the tape electrode due to its interaction with the induced magnetic field is considered. Two ways of controlling the surfacing process are proposed – one for case of using profiled ribbon electrode tape and the other – for case of using flat (non-profiled) ribbon electrode. The possibility of controlling the regularity of the process of moving the arc along the end of the electrode depending on the conditions of heat input of the arc energy into the electrode and the base metal and the weld pool is shown. This will allow to use ribbon electrodes with increased width, thus improving deposition process efficiency. Schemes of the process of magnetic control of arc movement along the end of the tape electrode due to the action of a magnetic field are presentedReferences
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