The causes and control of porosity in titanium alloy welding

摘要

The quality of welding joint determines the reliability and economy of welding structure to a great extent. The defects of welded joints often destroy the performance of components, and in some cases, accidents will occur. Therefore, the control of weld defects is particularly important. Porosity reduces the effective cross-sectional area of the weld, makes the weld loose, reduces the strength of the joint from the surface, reduces the plasticity, and also causes leakage, porosity is also a factor causing stress concentration, hydrogen porosity may also contribute to cold cracks. The alloys are removed the oil, rust, moisture and sundries on the welding wire, working groove and its inner and near surface.