Submerged Arc Welding of Titanium.

摘要

The submerged arc welding of titanium using CaF2 fluxes has been studied to determine the sources of nitrogen contamination and the effect of flux purity on arc stability and weld bead shape. It is shown that plasma jet entrainment and atmospheric absorption on the hot base plate ahead of the arc prior to flux melting are the primary sources of nitrogen contamination. The arc stability is strongly dependent upon the CaF2 purity. The high weld bead contact angle is a result of the metal transfer mode of the consumable titanium electrode. In addition, the effect of CaF2 flux on gas tungsten arc welds has been briefly studied, indicating enhanced weld penetration in the presence of a flux. A critical review of available information on Soviet titanium fluxes is also presented. (Author)