GR2 Titanium Clad Steel Plate For Industry

For titanium clad welds, the sources of oxygen, hydrogen and nitrogen should be strictly controlled. Oxygen, hydrogen and nitrogen are not only from the air, but also from other impurities that may melt into the molten pool. In addition to making the mechanical properties of titanium weld worse and reducing the corrosion resistance of the weld, these impurity elements are also the root cause of gas holes in the weld. Therefore, in the process of welding operation, the welding environment, the cleaning of the groove and the protection of the weldment are particularly important.

The fume contains a large number of harmful impurities, which are easily transferred to the weld pool and weld through the environment, forming welding defects. Especially when there is iron pollution in the working area, the mechanical properties and corrosion resistance of the welded joint will be reduced, and welding cracks will occur in serious cases. Therefore, when welding the titanium layer, ensure that the air in this area is clean, dust-free and smoke-free. In addition, the moisture in the air has a great impact on welding, which is also one of the reasons for producing pores. The higher the relative humidity of the air, the easier it is to produce pores. When the humidity exceeds 90%, it is easy to form dense pores in the weld. According to practical experience, if the relative humidity of air is controlled below 70%, the welding porosity caused by humidity can be well controlled. The wind speed during welding shall meet the following requirements: the wind speed during electrode arc welding shall not be greater than 8ms, and the speed of argon tungsten arc welding shall not be greater than 2m/s. The ambient temperature shall not be lower than - 5 ℃, and the test plate temperature shall not be lower than 5 ℃. Protective measures shall be taken when welding in rainy and snowy weather.

 

Titanium cladding and welding wire are easy to be contaminated, such as lubricant residue, oxide film, oil stain, paint coating and fingerprint used in the production of GR2 Titanium Clad Steel Plate for Industry. If these pollutants are not removed before welding, harmful impurities will be dissolved in the weld metal due to the thermal action of the arc during welding, which will have a negative impact on the weld quality. Therefore, pre-welding cleaning is an important part of successful welding of titanium coating. Before welding, the welding wire shall be kept clean and dry. Before use, the oxidized part at the end of the welding wire shall be cut off, and the oxide and grease on the surface shall be removed with abrasive paper and acetone.

In order to prevent the titanium coating from being polluted during the welding operation, 1mm stainless steel plate is used to protect the area 25mm away from both sides of the titanium weld, and the whole titanium coating is protected during the base layer welding.

(1) During assembly, the titanium coating shall be taken as the benchmark, and the misalignment shall not be greater than 1mm. The misalignment must be strictly controlled to prevent the welding quality of titanium coating from being affected due to excessive misalignment.

(2) Tack welds are only allowed on the base metal and should be carried out on the base side. The welding materials used for assembly and positioning must be the same as those used for formal welding.

(3) If the misalignment caused by the crack of tack welding seam exceeds the standard, it must be corrected before welding.