There are many types of desks and chairs on the market, the price difference is large, and the quality is also uneven. If you blindly choose cheap ones, then the quality is definitely not guaranteed. There are many factors affecting quality. If you want to buy good quality products, we must first understand what factors affect the quality of desks and chairs?
Process factors that affect the quality of desks and chairs
1. Welding wheel diameter
The diameter of the welding wheel determines the diameter of the nugget. As the new welding wheel is ground again and again, the diameter is gradually reduced. The touch area between the desks and chairs and the steel strip decreases, the current density increases, and the pressure on the welding point It is also added, so the diameter of the welding wheel cannot be too small.
2. Welding current
The influence of the welding current of the desks and chairs on the heat is related to the second power. As an adjustable parameter, it can be selected according to the thickness of the welded steel strip. The factors affecting the change of the actual current are the fluctuation of the power supply voltage and the resistance of the secondary loop. In order to ensure that the desks and chairs are not affected by external conditions, it is necessary to adopt a constant current control system.
3. Welding time
The welding heat of the desks and chairs is proportional to the welding time, but the power-on time is controlled by the running speed of the welding wheel. Under normal circumstances, there is no need to make adjustments. Even if you adjust, you only need to make small-scale adjustments.
4. Touch resistance
The greater influence on the occurrence and spread of heat is the resistance of the touch surface of the steel strip. The main influencing factors of the touch resistance are the cleanliness and roughness of the touch surface. If the touch surface of the desk and chair has high resistivity oxide or dirt The layer will increase the resistance. If only part of the dirt or oxide is present, the current will be unevenly distributed, so the touch surface needs to be kept clean and tidy. If the touch surface is rough and uneven, the desks and chairs will form part of the touch point, and a relatively large current will occur at the touch point. At the same time, the touch resistance will increase due to the decrease of the current channel.
Use factors that affect the quality of desks and chairs
1. Deliberate destruction: When using it, deliberately destroying, stepping on tables and chairs, hitting tables and chairs with hard objects, or using sharp objects to portray the tables and chairs, no matter how good the quality is, the desks and chairs are easily damaged, causing deformation or falling apart. It directly affects the shortening of its service life.
2. Improper maintenance: If you encounter strong corrosive detergents, the tables and chairs will be corroded. After a long time, the table and chair surfaces or the main frame will rust. Rust will cause the material to become thin and directly affect the product quality.
3. Inadequate cleaning: If it is not cleaned for a long time during use, it will cause residual oil on the desk, and if it is not cleaned regularly, it will cause the desktop to be corroded.
4. Pulling hard: Sometimes school activities need to move or move the desks and chairs. When moving, you must lift the desks and chairs to move. Do not pull hard, otherwise it will cause the table legs and chair legs to become loose or damaged.
What are the factors affecting the quality of desks and chairs? In response to this problem, the editor introduced the process factors and use factors that affect its quality. Process factors include welding wheel diameter, welding current, welding time, touch resistance, etc., use factors include deliberate damage, improper maintenance, improper cleaning, and harshness. Wait.