Welding is an important process in titanium equipment manufacturing. There are many welding methods, and appropriate welding methods should be selected according to the design structure and specific application conditions of titanium equipment or components.

The principle of welding method selection is to ensure the quality of welded joints, high production efficiency, simple operation and low cost. Among them, ensuring the weld quality should be the first. Only when we fully understand all the factors that affect the welding quality, can we achieve the goal of ensuring the quality of welded joints.

Influence of other impurities on weld metal properties

Other impurities refer to impurities that may melt into the molten pool except for gas impurities. The source may be that the welding operation environment is not clean, the welder wears dirty gloves to touch the weldment, leaving oil stains, the cotton wadding may be left after wiping the joint with cotton yarn before welding, and the rust, moisture and other organic substances may be generated when the welding production environment is mixed with the steel welding. These pollutants decompose into oxygen, hydrogen, nitrogen, carbon and other elements under the action of high arc temperature, and then dissolve in dissolved titanium. When the amount of these elements exceeds the solubility in titanium, corresponding compounds are formed, such as titanium dioxide, titanium hydride, titanium nitride, titanium carbide, etc. These compounds enter the lattice of titanium as the molten pool crystallizes, resulting in distortion of the outer zone, thus changing the mechanical properties of titanium.

Some trace elements are incorporated into titanium in a small amount. If the amount does not exceed the allowable range, it is still possible and sometimes desirable. However, excessive content of impurity elements is not allowed, especially organic impurities, which are harmful but not beneficial. This is because these impurities make the mechanical properties of titanium welds worse, reduce the corrosion resistance, and are also the source of pores in cold wind.

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