Abstract
Ggenerally, the deep penetration is often expected for the arc weld metal. However, the shallow penetration in case of purpose such as overlaying and functional thick film to the material surface by the alloying process is required. Penetration shape of weld metal is controlled in the heat transport by the convection of molten metal. The (1)∿(4)force ((1) electromagnetic force (2) friction force by plasma stream (3) surface tension (4) buoyant force) are considered as a driving force of this convection, and the action of this force changes by welding method, welding condition and mother metal, and the shape changes. Therefore, it is not easy that penetration shape of the weld metal optionally is made to change under condition to for give. In this study, the impression of magnetic field was considered as controlling element which positively effected the convection of molten metal. It is anticipated that condition of the arc and situation of the convection of the molten metal change, when it is welded in the magnetic field. Then, we examined how penetration shape of the weld metal changed by carrying out TIG arc welding in the magnetic field.
