Key factors affecting the surface quality of cold drawn tubes

- Apr 11, 2020-

The transition process of the droplet is closely related to the quality of the cold-drawn pipe products, and it has the following important significance for its discussion:

1. Influencing the role of cold drawn tube smelting. The smaller the droplet size and the larger the specific surface area, the better the smelting effect and vice versa.

2. Influencing the control of arc length. When the length of the smelting arc is too short, as in the current position: the transition process of the droplet is closely related to the quality of the cold drawn tube product, which has the following important significance for its discussion:

(1) Influencing the role of cold drawn tube smelting. The smaller the droplet size and the larger the specific surface area, the better the smelting effect and vice versa.

(2) Control of the arc length. When the length of the smelting arc is too short, such as about 10mm, this distance is close to the distance of the metal droplets, which will cause a short circuit between the electrode and the molten pool, which will cause the arc to subside and interrupt the smelting. Perhaps the frequency of the molten pool changes due to frequent short circuits. These two conditions will damage the normal smelting process and also affect the uniformity of the titanium ingot structure. Therefore, the arc length of melting is generally controlled above 15mm.

(3) Affect the surface quality of cold drawn tubes. As a result of the dispersion of the metal droplets, a small part of the metal splashes and adheres to the crucible; the effect of the arc on the metal molten pool also causes splashing; plus the rotation of the molten pool and the metal volatiles and impurities in the crucible wall Adhesion on the top constitutes the riser of the ingot. Because the riser cannot be melted by the metal pool, and more impurities are adsorbed or adhered, the titanium ingot can be processed after being flattened and peeled.

Cold drawn pipe is a long steel bar with a hollow cross-section and no joints. The pipe is hollow and has a set cross-sectional area. Many pipes are used to transport fluids, such as pipes for oil, gas, water and certain solid materials. When the circular cross-section is subjected to internal or external radial pressure, The force is relatively uniform, therefore, most steel pipes are round pipes.

https://www.ht-tube.com