Product introduction of laser welding automobile gas-liquid separator

Product Introduction of Gas-Liquid Separator

In terms of environmental protection technology, automobile manufacturers have always been automobile manufacturers. With the implementation of the six national standards, automobile manufacturers have been subject to more and more restrictions on emissions. This has enabled the research and development departments of manufacturers to continuously improve their products to achieve the goals of energy saving and low emissions. This newly developed gas-liquid separator can further achieve fuel saving and emission reduction in the automobile fuel tank system.

In the early days of the automobile industry, the burned oil was directly discharged into the atmosphere without filtering and exhaust gas treatment. This would cause incompletely burned gaseous oil and harmful gases to enter the atmosphere. At present, automobile parts can purify the exhaust gas discharged from the fuel tank system in a variety of ways, and the gas-liquid separator is one of them. The gas-liquid separator is placed between the fuel tank and the activated carbon canister. It is mainly used to separate the gaseous gasoline and then recycle it, while sending the exhaust gas to the next link for processing.

When the temperature in the tank changes, when the saturated gas and saturated gas are cooled or pressurized, some of the small droplets formed by the condensable gas components flow with the gas, which causes the gasoline in the fuel tank system to become gaseous. The gas-liquid separator intercepts the gaseous gasoline and returns it to the storage tank, while sending the exhaust gas to the activated carbon canister for filtration. Therefore, the gas-liquid separator has the function of saving fuel and protecting the environment.

Principle of Plastic Laser Welding

In plastic laser welding, the two layers of plastic have different penetration and absorption of laser. The upper layer is laser-transmissive material, and the lower layer is laser-absorbing material. During the welding process, the laser penetrates the upper material and absorbs the laser energy on the surface of the bottom material. The energy absorbed by the laser is converted into heat energy and melted on the surface of the bottom material. When the upper and lower solders are welded, they are clamped and the heat of the lower layer will be transferred to the upper material, causing the welding surface of the upper material to melt. The scope of this heat transfer effect is limited to a very shallow layer of the upper and lower welding surfaces, and will not affect other parts of the workpiece. During the plastic laser welding process, no flash, dust, smoke, etc. will be generated. It is a clean welding process with a very small heat-affected range.

As mentioned above, when laser welding plastics, the upper and lower plastic parts need to be clamped with a clamp to ensure that the upper and lower welding surfaces fit tightly. However, the Leiser laser GLOBO welding process used in this project, the GLOBO end itself is a device integrated with a glass spherical air cushion. The glass ball can not only focus the laser energy, but also play a clamping role. The glass ball can also roll arbitrarily on the surface of the workpiece without friction, and can weld complex shapes, three-dimensional and large workpieces.

Project Challenges

In order to ensure that the gas-liquid separator can withstand sufficient pressure inside, special welding points (lines) are added to certain parts of the separator shell to improve the welding strength. However, the increase in welding columns and welding ribs increases the welding difficulty. Compared with laser plastic welding, conventional plastic welding methods cannot achieve very high process stability and welding strength. Five welding points and a cross welding rib form a bulge. It is difficult to provide sufficient welding pressure with ordinary fixtures. The GLOBO welding process can easily apply welding pressure at these bulges through the contact between the glass ball at the end of the lens and the workpiece. At the same time, the lens accurately transmits the welding energy to the welding point to obtain a good welding effect.

Project realization

In order to ensure high production, the system uses a four-station rotary table to ensure high production of products. The operator only needs to put the workpiece into the fixture and press the start button on the table, and the fixture will move to the welding position. Using the GLOBO lens, the motion platform can achieve welding on the welding track on the surface of the workpiece. The pressure required for welding is achieved by means of an adjustable small cylinder connected to the GLOBO lens. During the welding of the spot and the rod, there is no need to change the welding program and parameters, only to compensate for the height of the spot during the lens travel.

When the workpiece is welded, the operator can place the workpiece in the fixture position without idling table. After the previous weld, you can start welding the new workpiece with the button.