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Automotive Sheet Metal Fabrication: Processes, Materials, Advantages

Table of Contents

The automobile is one of the most important transportation tools for industry, agriculture and even all walks of life, and also one of the most important activity tools in human daily life. In the fast-paced world of automotive manufacturing, sheet metal fabrication plays a crucial role in the production of vehicles. Sheet metal fabrication refers to the use of sheet metal fabrication equipment and tools for cold processing of metal materials to meet the requirements of manufacturing parts of different shapes and sizes.

sheet metal for cars

Sheet Metal Fabrication Techniques for Auto Parts

Sheet metal fabrication techniques for auto parts involve various processes to shape, cut, and assemble metal sheets into the required components. Here are some common sheet metal fabrication techniques used in the manufacturing of auto parts.

  1. Cutting

Shearing: Utilizing shearing machines to cut large sheets of metal into smaller, more manageable pieces.

Laser Cutting: Employing laser beams to precisely cut intricate shapes and patterns in the metal sheets.

Waterjet Cutting: Using high-pressure water mixed with an abrasive substance to cut through metal sheets.


  1. Bending

Press Brake Bending: Utilizing a press brake machine to bend metal sheets at specific angles according to design requirements.

Roll Bending: Employing a set of rollers to gradually bend the metal sheet into a curved or cylindrical shape.


  1. Stamping

Blanking: Cutting a piece of sheet metal to create a flat pattern (blank) that will later be formed into a specific auto part.

Punching: Using a die and punch set to create holes or specific shapes in the sheet metal.

Embossing: Pressing a design or pattern into the surface of the metal sheet.


  1. Forming

Hydroforming: Shaping metal sheets using fluid pressure, often with the assistance of a die, to create complex and lightweight auto parts.

Incremental Sheet Forming: Gradually forming the sheet metal into its final shape through a series of small deformations.


  1. Welding

Spot Welding: Joining metal sheets by applying pressure and heat at specific points using electrodes.

MIG/TIG Welding: Using metal inert gas (MIG) or tungsten inert gas (TIG) welding techniques for more precise and continuous welding applications.

Resistance Welding: Employing electrical resistance to generate heat for welding two metal sheets together.


  1. Assembly

Mechanical Fastening: Using bolts, nuts, and screws to assemble different sheet metal components.

Adhesive Bonding: Applying adhesives to join metal sheets, providing additional strength and stiffness.

Riveting: Joining metal sheets by driving rivets through pre-drilled holes and securing them on the opposite side.


  1. Surface Treatment

Powder Coating: Applying a dry powder to the metal surface and then curing it to create a durable and attractive finish.

Painting: Using various painting techniques to protect the metal surface and enhance aesthetics.

Galvanizing: Applying a layer of zinc to protect the metal from corrosion.


  1. Quality Control

Dimensional Inspection: Checking the dimensions of fabricated auto parts to ensure they meet design specifications.

Visual Inspection: Examining the surface quality and appearance of the finished parts.

Non-Destructive Testing: Using methods like X-ray or ultrasonic testing to identify potential defects without damaging the parts.

Automotive Sheet Metal Requirements for Metal Materials

Because cars often work in extremely harsh environments, with heavy loads, high speeds, high vibrations, and high dust, and are often exposed to the sun and rain, and the operating temperatures are very different. Therefore, the sheet metal parts of the car, especially the sheet metal covering parts, are Stricter requirements were put forward.

1.Good mechanical properties

Since automobiles are often in high-speed, heavy-load, and frequent vibration states during operation, automobile sheet metal parts must have sufficient strength, appropriate hardness, good toughness, and good fatigue resistance to ensure the normal operation of the automobile. It will not be deformed or damaged to meet the needs of transportation.

2. Good process performance

In automobile manufacturing and repair, the shapes of many sheet metal structural parts are very complex. In order to avoid difficulties in sheet metal work, sheet metal materials are required to have good process performance. This is specifically reflected in the following aspects.

-Pressure processing performance

Sheet metal materials must have good pressure processing properties to ensure the smooth forming of sheet metal workpieces, that is, they must have good plasticity. It must have the ability to produce permanent deformation without being damaged under the action of external forces. For cold work parts, good cold plasticity is required, such as automotive stamping parts.


Many automotive sheet metal parts are welded together through spot welding and oxygen welding, so sheet metal parts are required to have good welding performance. This is especially important in car repairs and repairs.

Materials with good weldability have high welding strength and low tendency to crack.

-Chemical stability

Most automobile covering parts work in an open-air environment and are often in contact with water and steam. Especially like mufflers, they often work under higher temperatures and corrosive gases. This requires sheet metal parts to have good chemical stability, which requires corrosion resistance and strong anti-rust ability at room temperature, and also requires not to be corroded or deformed under high temperature or sun exposure.

3. Dimensional accuracy and quality

The dimensional accuracy and intrinsic quality of the plate have a great impact on sheet metal processing, especially on molded parts. The specific requirements are:

(1) The plate has high dimensional accuracy, uniform thickness and no deformation.

(2) The surface is smooth and smooth, without defects such as bubbles, shrinkage holes, scratches, and cracks.

(3) There is no serious corrosion, oxide scale and other attachments.

(4) The structure is uniform, and there is no obvious difference in crystal structure and hardness.

automotive sheet metal fabrication

Materials Commonly Used in Automotive Sheet Metal Fabrication


Ordinary low-carbon steel has good plastic processing properties, and its strength and stiffness can also meet the requirements of automobile bodies, so it is widely used in automobile bodies. However, to meet the lightweight requirements of automobiles, the proportion of various types of high-strength steel plates used in automobile steel plates is increasing.


-Aluminum alloy

Compared with automotive steel plates, aluminum alloys have the advantages of low density (27g/cm3), high specific strength, corrosion resistance, good thermal stability, easy molding, recyclability and regeneration, and the technology is also relatively mature. In addition, because all aluminum alloys can be recycled and reused, aluminum alloys are very popular among environmentalists. The use of aluminum materials in automobiles can improve safety and reduce body mass.

Two studies published by the Aluminum Association show that the selective use of aluminum materials can not only reduce the weight of the car body but also improve its safety and fuel efficiency.



Compared with aluminum alloys, magnesium alloys are lighter and stronger. At the same time, magnesium alloys also have the characteristics of damping, good thermal conductivity, strong electromagnetic shielding ability and good dimensional stability. These excellent properties make magnesium alloys widely used in the aviation industry and automobile industry.


-Titanium alloy

Titanium alloys are suitable for manufacturing suspension springs, valve springs and valves. Compared with using high-strength steel with a tensile strength of 2100MPa to make leaf springs from titanium alloys, the dead weight can be reduced by 20%. However, one issue that must be paid attention to when using titanium alloys is that when the alloy strength reaches a certain level, the fatigue strength will Strength has an inverse dependence. Low-cost titanium alloys are used in the design of special automotive coil springs because titanium alloys have low density, low elastic coefficients and excellent corrosion resistance.

Automotive Metal Fabrication

Advantages of Sheet Metal Processing in the Automotive Industry

Sheet metal fabrication is a cornerstone of the automotive industry, offering multiple advantages that streamline production and improve vehicle performance.

1. Customizability. Sheet metal can be precisely cut, bent and shaped to meet the exact design specifications of different models.

2.Durability. The materials used in sheet metal fabrication are corrosion-resistant, can withstand high-intensity stress, and can withstand considerable wear and tear, which is critical to the longevity and safety of a vehicle.

3. Cost-effective. Sheet metal fabrication involves processes such as stamping and welding, which facilitates mass production. This scalability helps reduce manufacturing costs, making it an economically viable option for both luxury and economy models.

4. Lightweight Design. Sheet metal fabrication allows for lightweight design of the body structure, which can improve the fuel efficiency and performance of the vehicle.

Applications of Metal Fabrication for Automotive

  • Doors, roof, sidewalls, front and rear body panels.
  • Lamp shades, front and rear bumpers, body trims
  • To protect chassis and suspension components
  • Hoods
  • Exhaust hoods
  • Radiator cover
  • Fuel tanks
  • Dashboards, door panels, center consoles, seat structures


Make Metal Car Prototypes and Parts at EASIAHOME

Precision, quality and efficiency are crucial for sheet metal fabrication in the automotive industry, affecting safety on the road.EASIAHOME has a professional team with 17 years of experience in automotive sheet metal fabrication and has worked with several well-known companies.

Meanwhile, we have quite competitive price, high quality after-sales service and fast turnaround time.By choosing EASIAHOME, we can provide comprehensive solutions tailored to the unique needs of the automotive industry.

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