EFEITOS DO PROCESSO DE SOLDAGEM A-TIG EM AÇOS INOXIDÁVEIS AUSTENÍTICOS

Abstract

In the TIG welding process, the electric arc is established between a non-consumable tungsten electrode and the material to be welded. In this process it has a high quality of welding, can be used to weld almost all types of metals and has a concentrated heat source reducing the Heat-Affected Zone (HAZ). One of the major disadvantages of this process is the low penetration rate in a single pass and a lower deposition rate compared to a coated electrode, for example. One of the mechanisms to overcome the problem of low penetration is the use of active fluxes , which are chemical elements formed by oxides and halides and are distributed over the metal surface prior to the welding process ,that in some cases, can increase it by more than 200%, in addition to being reported by some authors, in stainless steels, an increase in ferrite content , improvements in mechanical properties, reduction in the formation of hot cracking and angular distortions with the addition of these elements. When using active fluxes, welding is called A-TIG.