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Do You Know The Welding Performance Of Cutting Titanium Plate?

Oct. 10, 2019

Welding and cutting of the cut Titanium Plate is inevitable, but because of the characteristics of the titanium plate itself, the welding and cutting time also has its own particularity, and it is easier to have various joints in the welded joint and the heat affected zone (HAZ). Disadvantages. Pay special attention to the physical properties of the titanium plate when welding. For example, the austenitic-cut titanium plate has a coefficient of thermal expansion which is 1.5 times that of a low-carbon titanium plate and a high-chromium-cut titanium plate; the thermal conductivity is about 1/3 of that of a low-carbon titanium plate, and the thermal conductivity of a high-chromium-cut titanium plate It is about 1/2 of low carbon titanium plate; the specific resistance is more than 4 times that of low carbon titanium plate, and the high chromium cutting titanium plate is 3 times that of low carbon titanium plate. These conditions, combined with the density, surface tension, and magnetic properties of the metal, all affect the onset of welding conditions.

Titanium Plate

Titanium Plate

To sum up, the welding function of cutting titanium plates is the first to reflect these aspects are shared by Titanium Sheet Factory:

(1) High temperature crack: The high temperature crack referred to herein means a crack related to welding. High temperature cracks can be roughly classified into condensation cracks, microcracks, cracks in HAZ (heat affected zone), and reheat cracks.

(2) Low-temperature cracking: Low-temperature cracking sometimes occurs in a martensitic-cut titanium plate and some ferrite-cut titanium plates having a martensite arrangement. Because the primary cause of the attack is hydrogen dispersion, the degree of bondage of the welded joint, and the hardening arrangement between them, the solution is primarily to reduce the dispersion of hydrogen during the welding process, to suitably perform preheating and post-weld heat treatment, and to reduce the degree of restraint.

(3) Resistance of welded joints: In the austenitic-cut titanium plate, in order to reduce the high-temperature crack sensitivity, 5%-10% of ferrite remains between the components. However, the presence of these ferrites results in a decrease in low temperature resistance. When the duplex-cut titanium plate is welded, the amount of austenite in the welded joint region is reduced to affect the onset of the resistance. Others followed by the addition of ferrite, the resistance value has a significant reduction trend.

The reason why the resistance of the welded joint of the high-purity ferritic cut titanium plate has been remarkably lowered is due to the incorporation of carbon, nitrogen and oxygen. In the meantime, the oxygen content in the welded joint of some titanium plates is added to form an oxide type doping, and these impurities become a source of crack initiation or a method of crack propagation to lower the resistance. However, some titanium plates are mixed with air in the maintenance gas, and the nitrogen content is added to the {100} surface of the cleavage surface of the substrate to cause the strip-like Cr2N, and the matrix becomes hard and the resistance is lowered.

(4) σ phase embrittlement: austenitic cut titanium plate, ferrite cut titanium plate and dual phase titanium plate are prone to σ phase embrittlement. Because the alpha phase is divided by a few percent in the arrangement, the tolerance is significantly reduced. “The phase is usually separated in the range of 600-900 ° C, especially at 75 ° C. As a preventive method to avoid the phase attack, the ferrite content should be reduced as much as possible in the austenitic cutting titanium plate. .

(5) At 475 ° C embrittlement, the Fe-Cr alloy was decomposed into a low chromium concentration α solid solution and a high chromium concentration α' solid solution when held at 475 ° C for a long time (370-540 ° C). When the chromium concentration in the α' solid solution is more than 75%, the deformation changes from slip deformation to twin deformation, and then 475 °C embrittlement occurs.

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