What are the advantages and disadvantages of cast iron welded tables and steel welded tables? What are the advantages of welding tables after nitriding?

Advantages and disadvantages of cast iron welded tables and steel welded tables are as follows:

- Cast iron welded table:

   - Advantages:

     - Good shock absorption: Cast iron material has better shock absorption performance. During use, it can effectively reduce noise and shaking caused by external vibrations or knocks. It is more suitable for occasions with high requirements for stability and quietness, such as laboratories and precision processing workshops. For example, when conducting fine experiments in the laboratory, a cast iron welded table can ensure the stable placement of experimental instruments and reduce the impact of table vibrations on experimental results.

     - Higher heat resistance: Cast iron can withstand higher temperatures and is not easily deformed or damaged by high temperatures. It is suitable for use in environments where high-temperature objects may be contacted or high-temperature operations are required, such as welding workshops and heat treatment studios.

     - Good processability: Cast iron material is relatively soft and easy to perform processing operations such as cutting, welding, and drilling. It is convenient to customize and transform according to actual needs and can meet the personalized requirements of different users for the shape, size, and function of the table.

     - Higher strength and load-bearing capacity: A properly designed and welded cast iron table has high structural strength and can withstand greater weight and pressure. It is suitable for placing heavy equipment, tools, or workpieces.

   - Disadvantages:

     - Prone to rust: Cast iron material is easy to rust, especially in a humid environment. If good rust prevention treatment is not carried out, rust will quickly appear on the table surface, which not only affects the appearance but also reduces its service life. Therefore, regular maintenance is required, such as applying rust-proof paint and keeping it dry.

     - Heavy weight: Cast iron has a large density, resulting in a heavy weight of cast iron welded tables. It is not convenient to carry and move. In cases where the table position needs to be adjusted frequently or the site layout needs to be changed, it will bring certain difficulties.

     - Higher welding difficulty: The welding performance of cast iron is relatively poor. Higher technology and experience are required during the welding process. Otherwise, welding defects such as cracks and pores are easy to appear, affecting the structural strength and stability of the table.

- Steel welded table:

   - Advantages:

     - Good corrosion resistance: Steel materials after surface treatment, such as galvanizing, chromium plating, spraying, etc., have better corrosion resistance. They can resist the erosion of moisture, oxygen and other corrosive substances in the air, and are not easy to rust and corrode. They are suitable for various environments.

     - High strength and light weight: Steel has high strength and hardness and can bear a large load. At the same time, its weight is relatively light, which is convenient for handling and installation. Compared with cast iron tables, steel welded tables are more flexible and convenient on the premise of ensuring strength and can be moved at any time according to needs.

     - Beautiful appearance: Steel materials can present a smooth and bright appearance through various processing techniques and surface treatment methods. It has a high degree of aesthetics and can match different decoration styles and environments. It is suitable for various office places, commercial places and home use.

     - Good welding performance: Steel has good welding performance, high strength of welding joints, and the welding process is relatively easy to control, which can ensure the structural stability and firmness of the table.

   - Disadvantages:

     - Poor shock absorption: Compared with cast iron, steel has poorer shock absorption performance. When subjected to external vibrations or knocks, it is easy to produce large noise and shaking, which is not very suitable for occasions with high shock absorption requirements.

     - Strong thermal conductivity: Steel has good thermal conductivity. When in contact with high-temperature objects, it is easy to transfer heat to other parts of the table, which may cause the table top to overheat and affect the safety and comfort of use. In some occasions where heat transfer needs to be avoided, additional insulation measures are required.

     - Higher price: The cost of high-quality steel is relatively high, so the price of steel welded tables is relatively expensive. Especially for some tables made of special steel or with advanced surface treatment processes, the price may be higher.

The advantages of welded tables after nitriding are mainly as follows:

- High hardness and high wear resistance: Nitriding treatment can form a nitrided layer with extremely high hardness on the table surface. Its hardness can reach HV1000 - 1200, which is equivalent to about HRC70, much higher than the hardness of ordinary steel. This makes the table surface have strong wear resistance, can resist various wear and tear, and extend the service life of the table.

- Higher fatigue strength: After nitriding, a large residual compressive stress will be generated on the surface of the part. This residual compressive stress can partially offset the tensile stress generated under fatigue load, delay the fatigue failure process, and significantly improve the fatigue strength of the table. This is particularly important for welded tables that often need to bear alternating loads.

- Higher anti-seizure performance: Some parts that bear high-speed relative sliding are prone to seizure or scratch. However, the welded table after nitriding can still maintain high hardness under the condition of short-term lack of lubrication or overheating, and has high anti-seizure performance, which can effectively avoid part seizure or damage caused by friction and wear.

- Good corrosion resistance: After nitriding, a dense nitride layer with high chemical stability is formed on the table surface. This nitride layer can significantly improve the corrosion resistance of the table and can resist the corrosion of atmosphere, tap water, water vapor, benzene, oil stains, weak alkaline solutions, etc., and maintain good appearance and performance.

- Small deformation: The temperature of nitriding treatment is relatively low, generally 480 - 580℃, and the heating and cooling speed is very slow. There is no structural change in the core of the part, and it still maintains the quenched and tempered structure. Therefore, the deformation of the table after nitriding is very small, and the deformation law can be mastered and controlled, which can ensure the dimensional accuracy and structural stability of the table.