Cracking is a frequent defect in the welding of titanium plates. Titanium weld cracking belongs to cold cracking, which is mainly caused by hydrogen in the weld seam. The sources of hydrogen are mainly moisture and oil in the plate and welding wire, and the environmental humidity is the main reason for the increase of hydrogen in the weld.
During welding, a large amount of hydrogen is dissolved in the molten pool under the action of high temperature, and during the cooling and solidification of the weld, the hydrogen is very easy to escape due to the rapid reduction of solubility. If the weld is cooled too fast, the hydrogen will not be able to escape and remain in the weld, which will put the hydrogen in the weld in a supersaturated state, and thus the hydrogen will have to diffuse desperately and promote further embrittlement in this area.
If there is a gap effect in this area and the concentration of hydrogen is high enough, cracks may occur. Especially in winter construction, the ambient temperature is low and water vapor adheres to the titanium plate, creating conditions for hydrogen increase in the weld seam. As the titanium plate is too thin, the steel plate is relatively "eat temperature", the temperature rises slowly, the corresponding titanium composite layer weld cooling rate is too fast, in the cooling process, the residual hydrogen in the weld can not escape, in the weld in the form of supersaturation, and finally lead to the appearance of cracks.
Therefore, in the welding process of titanium steel composite plate, the surface of the base material and welding wire should be carefully cleaned and the ambient temperature should not be lower than 5℃. In winter construction, the application of flame preheating base steel surface, one is to remove the moisture around the weld; the second is to increase the temperature of the weld and reduce the cooling rate of the weld.
Baoji Taicheng Clad Metal Materials Co., Ltd is a titanium steel clad sheet supplier, providing you with the best quality metal clad sheets. At present, the company has sufficient stocks of various metal-clad plates, and we can provide customized titanium steel clad plate services. If you have related needs or questions, welcome to consult!
