Titanium wire for welding is the core consumable material in the advanced welding industry, and is applied in aviation, medical implantation, and chemical anti-corrosion among other important applications. The accuracy of the welding processing itself directly affects the strength and plasticity of the welded joint and the corrosion resistance. Compared with ordinary metal welding wire, it has strict technical barriers in raw material screening, processing accuracy, and environmental control.
The production process： With this begining High purity titanium raw material control is tight generally according to ASTM standard use sponge titanium or titanium alloy master batch, impurity content control in ppm. Melting process is one of the key control textile, The main procedures is vacuum consumable arc melting (VAR) technology ,some high precision circumstances may be advoided by vacuum induction melting (VIM). The VAR process has good capability to purge interstitial elements such as oxygen, nitrogen and hydrogen by multiple melting cycles - hydrogen mass fraction should be ≤0.005%, oxygen ≤0.13% Even small fluctuations in these elements can exacerbate segregation in the welding pool, leading to a decrease in weld plasticity, weakened crack resistance, and even causing welding joint failure.
During the hot processing stage, the melted titanium ingots are processed into titanium rods or wire blanks through forging, rolling, and other processes. The processing temperature must be strictly controlled within the phase transition temperature range of the titanium alloy to avoid overheating or overburning. This step not only determines the initial grain size of the material (ideal grain diameter controlled below 50 μ m), but also affects the formability of subsequent cold working. By optimizing the hot processing parameters to form a uniform and fine equiaxed crystal structure, the risk of wire breakage during subsequent drawing processes can be significantly reduced, and production efficiency can be improved.
Cold drawing is the core process of forming titanium welding wire, which requires multiple incremental drawing processes. The deformation of each process is controlled between 15% -25% to avoid material brittleness caused by excessive deformation in a single process. Due to the accumulation of residual stress inside the material during the drawing process, intermediate annealing treatment is required after the critical pass. The annealing is performed under vacuum or argon high purity protective atmosphere at a temperature of 600-700 ℃. The holding time is adjusted according to the wire diameter, which can recover the plasticity of the material and remove the DBs and internal stress. It can also prevent the surface oxidation to forming brittle layers, and the the continuous of the process is assure.
The refined processing and comprehensive testing in the finished product stage are the last line of defense. Surface treatment requires the removal of pollutants such as oxide scale and oil stains through processes such as mechanical polishing, acid pickling, and passivation to ensure the smoothness of the welding wire surface and avoid the formation of pores during welding. The dimensional accuracy control should reach ± 0.01mm, and the straightness and winding performance should be tested through specialized equipment to ensure that the entire roll of welding wire is free of bending and uneven tension. In addition, it is necessary to conduct spectral analysis, eddy current testing, and mechanical performance sampling on the finished products to ensure that the chemical composition, surface defects, tensile strength, and other indicators meet the standards, and that the performance of the entire roll of welding wire is highly consistent, meeting the stable operation requirements of automatic welding equipment and providing reliable guarantee for high-end equipment manufacturing.
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