Development of the Automotive Bumper
a.Bumper Function
The car bumper is a safety device designed to absorb and reduce the impact force of external collisions, protecting the front and rear parts of the vehicle.
b.Material development
- Metal Bumper
In the early days of automobiles, the bumper and crash beam were the same component. At that time, bumpers were primarily made of metal and chrome-plated, attached to the vehicle frame with rivets or welding, leaving a significant gap between the body and the bumper.
- Plastic Bumper
Over time, bumpers and crash beams were separated in their functions. The bumper, usually made of elastic materials like plastic, absorbs the shock of a collision, while the crash beam, generally hidden behind the bumper or within the car doors, is made of metal and enhances defense during impact.
Today, bumpers are commonly made from plastic. This material is treated through special processes to be lightweight, durable, elastic, and impact-resistant. Unlike metal bumpers, plastic bumpers can absorb and dissipate collision energy more effectively, reducing damage to the vehicle and pedestrians.
The plastic bumper deforms quickly during impact, absorbing the energy and distributing the force to other parts of the car to lower the risk of vehicle damage. This design not only protects the vehicle but also reduces repair costs and time. In low-speed collisions, the bumper acts like a “cushion,” easing the impact force. The elasticity allows the bumper to return to its original shape after minor impacts, minimizing vehicle damage.
Additionally, the design of vents and heat sinks on bumpers helps with engine cooling, ensuring the vehicle runs smoothly.
Broken Bumper: To Repair or To Replace? That is the Question.
a.Extent of Damage (Area and Depth)
The decision to repair or replace the car bumper depends on the extent of the damage.
If the crack is small, it can be repaired through welding. However, if the damage exceeds repairable limits, replacing the bumper is necessary. The bumper plays a crucial role in absorbing and reducing impact force. If the damage is extensive, repairing it would not restore its original shock-absorbing function.
If the crack extends beyond the surface coat into the plastic or metal layer, it could affect the bumper’s ability to absorb impact, and replacement is needed. If the crack is longer than half the width of the bumper, even after welding, it is likely to crack again and significantly reduce its protective capabilities. In this case, replacement is the best option.
b.Material
The material of the bumper affects the repair method.
Plastic bumpers can be repaired by welding, followed by repainting to restore their appearance.
Carbon fiber bumpers are also repairable but require specialized equipment and are harder to fix. Usually, carbon fiber bumpers damage are replaced.
For metal bumpers, welding and painting require professional tools and expertise, so it’s typically best to visit an authorized service center.
c.Cracked Bumper Repair Cost
If the cost of repairing the car bumper is close to the price of a new one from the original manufacturer, repairing it is not worth it.
In such cases, it’s better to purchase the original replacement part. For metal bumpers, repairs tend to be more expensive, so replacing the bumper may be a more economical choice.
Summary
If the bumper is made of plastic and has small cracks, welding repairs can be done. Car owners with good DIY skills and the necessary tools can handle this repair themselves.
SAILI NEW ENERGY supports a wide range of vehicles, manufacturing exterior accessories for various models, and offers wholesale services. If you’re interested, feel free to contact us, and we will provide a personalized quote.
A simple guide on how to fix broken bumper
a.Car Bumper Dent Repair
- Remove the car bumper and identify the area needing repair.
- Use a heat gun to heat the deformed section.
- Once heated, the plastic softens, and you can use your hands or other tools to push the deformed area back into place. Be careful not to burn yourself.
- Once the deformation is corrected, the repair is complete.
b.Cracked Bumper Repair
- Remove the bumper and secure the area with tape to prevent misalignment during welding.
- Use a plastic welding gun to apply heat to the back of the crack.
- While heating the welding rod, move it along the crack.
- Once welded, allow it to cool before sanding smooth and repainting.
Alternatively, you can use specialized chemical agents for repairing the bumper scratch, which are easy to use.
c.Note
This welding method is suitable only for small cracks. If the bumper is severely damaged or made of a special material, the bumper scratch repair cost may be high, and replacement may be the better option. Our bumpers meet the same quality standards as the original manufacturer’s, undergo multiple inspections, and are certified. For more information, visit SAILI BUMPER.
