1. Manual argon tungsten arc welding

Tungsten argon arc welding non melting electrode arc welding is to use the arc generated between the tungsten electrode and the weldee to heat melt the seam of the weldee and make the weldee melt together. During the welding process, welding wires can be added or not, and the tungsten electrode, weld pool, weld near the seam and the melting end of the added welding wire should be protected by argon.

2. Shielding gas

The shielding gas sprayed from the welding nozzle covers the entire tungsten electrode length and the molten pool area melted by the arc to avoid air pollution. The commonly used gases are inert gases argon or helium. The thermal conductivity of argon is small, and decomposition absorption does not occur under the action of the arc, so the heat loss of argon is small, and the arc voltage is low, about 8-15V. In addition to the importance of the purity of the shielding gas (greater than 99.98%), the protection effect is also related to the geometric dimension design of the welding nozzle, which can ensure that the argon flow from the welding nozzle is laminar rather than turbulent. Generally, the height of the welding nozzle is 1.5 times of the nozzle diameter.

During fusion welding, the molten pool is like a small metallurgical furnace, and the molten metal is exposed to the atmosphere. If no corresponding protective measures are taken to isolate the molten titanium metal from the air, oxygen, nitrogen, hydrogen and other gas elements will be melted into titanium, forming brittle oxides or nitrides, which will sharply reduce the plasticity of weld metal and increase the tensile strength. In serious cases, brittle fracture will occur, and the plasticity is equal to zero.

Some trace elements are dissolved in a small amount Medical titanium material If the quantity does not exceed the allowable range, it is OK, and sometimes it is what we want. However, excessive content of impurity elements is not allowed, especially organic impurities, which are harmful but not beneficial. This is because these impurity elements not only make the mechanical properties of titanium welding worse, but also reduce the corrosivity. They are also the source of pores in the weld.

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