Pore issues in titanium plate welding seams

Pores are a common defect in titanium welding, mainly due to the influence of hydrogen. The surface of the plates and welding materials is not clean, and the moisture and grease on the operator's gloves, as well as the sand particles and flying dust ground by the angle grinder, are all sources of hydrogen. The formation of pores in the weld metal mainly affects the fatigue strength of the joint.
The main process measures to prevent the formation of pores are:
(1) The protection of neon gas should be pure, with a purity of not less than 99.99%. Reinforced plastic tubes should be used for air ducts, and rubber tubes should not be used.
(2) Thoroughly remove organic matter such as oxide skin and oil stains from the surface of the welded parts and welding wires.
(3) Apply good gas protection to the molten pool, control the flow rate and flow rate of argon, and prevent turbulence, which may affect the protection effect.
(4) Correctly selecting welding process parameters, increasing the residence time of the weld metal in the melt pool, allowing bubbles to escape, can effectively reduce porosity.
(5) When welding, small heat input should be used, and it is best to use pulse argon arc welding. This can improve joint plasticity, reduce overheating and coarsening, reduce deformation, increase penetration depth, and reduce the generation of pores.