How Are Semi Trailers Made?


You must often see all kinds of semi-trailers on the highway. A semi-trailer can transport many types of goods. Designers have created a variety of them for various applications. So this article is about how semi trailers are made.

Purchase steel


The semi-trailer is welded from 4-5 tons of various types of steel. The girder must be high-strength steel, which is generally supplied by large steel plants at home and abroad.


The purchased steel needs to be cut into various shapes according to the designed size. The steel is cut accurately and efficiently by automatic underwater plasma cutting machines.


Press the web of the girder, the cross beam of the semi trailer, the side beam, and the column with stamping machines, bending machines, and other equipment.

Welding semi-trailer girder

Welding_ semi_trailer_girder

The cut parts need to be welded together. Some large factories have been equipped with automatic welding robots, and the effect is fast and good.

Skeleton assembly

The longitudinal beam, cross beam, and side beam of the trailer are welded together, and the skeleton of the semi-trailer is basically completed.

Install suspension


Then start welding the suspension part of the trailer, which is the most critical part of the semi trailers’ load-carrying capacity and will be combined with the driving system later.

Floor laying


There are mainly two manual welding soleplates for semi trailers: flat and checkered plates. The friction of checkered plates is relatively large. And customers can customize them according to the characteristics of their goods.

Install column

The column needs to be installed next if it is a barn trailer. In this step, some are fixed with screws, and some are directly welded. These two methods have their advantages and disadvantages.

Wing panels and rails

This is labor-intensive work, most of which adopts manual welding. Some manufacturers also outsource these things to other processing plants.

Install the door rail


After all kinds of fence doors are manufactured, they are welded to the trailer, and the appearance of the trailer is basically complete.

Install the outrigger


Outriggers are used when parking semi trailers. Most semi trailers will not manufacture such parts in person, and most of them are supplied by specialized manufacturers, such as Jost, etc.

Sandblasting and derusting

Before painting, the semi trailers will be sandblasted to remove the rust on the trailer. After painting, the anti-rust ability of the trailer can be greatly enhanced.



Paint the trailer according to the needs of customers. At present, most trailer factories use manual painting. A semi trailer needs to be painted 2-3 times. This kind of work is very dirty and tiring.

Axle installation


The semi-trailer factory purchases the trailer axle from Fuhua, BPW, and other manufacturers and then installs it on the trailer.

Install tires

Tires are a significant consumable of semi trailers. Users can generally purchase tires of designated brands or purchase tires by themselves for installation.

Circuit and air circuit


Finally, a complete semi-trailer was born after installing the circuit, air circuit, and ABS brake debugging.

Conclusion: Semi Trailers For Sale

In conclusion, the making of semi-trailers is not simple. Every process is crucial. In addition, the high-quality selection of materials should not be ignored. After all, it is about the safety of the semi-trailer.
As a professional China semi-trailer manufacturer and truck trailer factory, we have a wide variety of semi trailers for sale. For example, Fuel Tanker Trailers, Flatbed Trailers, Low Bed Trailers, Dropside/Fence Cargo Trailers, etc. Feel free to contact us.

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