How to identify the quality of metal products

Metal products are indispensable products in modern industry and life. How to distinguish their quality is the problem we need to pay attention to when we buy and use them. This paper will discuss the quality discrimination method of metal products from the aspects of metal material quality, production process, surface treatment, structure design, function and so on.

I. Quality of metal materials

The quality of metal products depends first of all on the quality of the metal materials used. Different brands and different manufacturers may have different materials, which will affect the quality of products. How to distinguish the quality of metal materials?

1. Metal mark: Qualified metal products should have clear metal mark, such as iron, steel, copper, aluminum, etc. These signs should conform to the standard, generally prominent location of work in progress identification.

2. Tensile force and compressive force: When buying large metal products, you can measure the size of tensile and compressive force with the help of pressure testing instruments to understand whether the strength of the material is enough.

3. Weight: In general, good quality metal products are heavier, while poor quality products use lighter materials.

4. Surface gloss: A high quality metal surface is usually smooth and should have no obvious scratches or other defects. The surface of inferior products will have burr, concave and convex unequal problems.

Two, production technology

The production process of metal products has great influence on its quality. Improper welding, untreated sharp edges, cracks, deformation and discoloration may occur in products with non-standard production processes.

1. Welding problems: welding processes are used in the production of some metal products, and different welding methods, welding materials and welding traces will affect the performance of the products. The flatness of the welding surface, the size of the gap, the absence of pores, the absence of oxidation in the welding area and other problems need to be checked.

2. Surface treatment: The surface treatment of metal products determines the surface quality and corrosion resistance. Manufacturers should use proper treatment methods to ensure smooth surfaces and good corrosion resistance.

3. Mold specification: If the mold specification of the production product is too large or too small, it may lead to the shape and size of the product is inappropriate.

Three, surface treatment

Surface treatment and quality of metal products are also inseparable, normal surface treatment can increase the beauty of products and corrosion resistance.

1. Color: The color of the surface spraying should be uniform, and there should be no color inconsistency or obvious scratches.

2. Surface luster: high quality metal surface should be maintained, after proper polishing and processing, so that the surface is smoother.

3. Coating thickness: Too thin coating thickness will make products vulnerable to environmental oxidation and corrosion, so ensure that the thickness of the coating is in line with the specifications.

Four, structural design

The structure design of metal products also has a great influence on its quality. Reasonable structure design can increase the stability and bearing capacity of the products.

1. Strength design: The design of metal products should be based on the actual use of the environment and demand to carry out strength design, so that the products can be more durable.

2. Structural connection: Reasonable structural connection can avoid loosening or cracking of products, and it is necessary to check and confirm that the connection point is firm and stable.

Five, function

The function of metal products is a matter of great concern to users. How to ensure the normal operation of the initial function of metal products and maintain the stable performance in long-term use?

1 motor performance: metal products may contain motors, and the reliability of the motor part determines the service life and efficiency of the products, focus on checking the motor speed, power, noise size and other issues.

2. Polycarbonate shell: metal products are generally made of polycarbonate plastic or gray cast iron shell, of which polycarbonate shell is very important for the safety and protection performance of products.

Conclusion:

The quality of metal products not only depends on the quality of metal materials, but also depends on the production process, surface treatment, structural design, function and other aspects. As a purchaser, we should carry out a detailed inspection and evaluation from these aspects to select high quality metal products.