The basic principle of the expansion section is that it is composed of a relatively static slide and a dynamic slide stacking to form a transition body that is consistent with the cross-section of the trolley body, and is free to move linearly when the temperature of the trolley line changes. Because static slides and dynamic slides are stacked, no matter how they are stretched or contracted, it can give the brush of the collector a straight transition plane, thus overcoming the narrow expansion range brought by the expansion joints in the earlier period, and the current collector. Difficulties in brushing cause power failures, small contact surfaces and tripping. Because both ends of the static slide and the dynamic slide are directly connected with the body of the slide wire, two slide guides are provided at the same time to guide the static slide and the dynamic slide interspersed. Therefore, it has a good coaxiality. At the same time, two copper flexible connections in parallel with the sliding tabs are also arranged above both ends of the static slide and the dynamic slide, thereby more stable and increasing the current-carrying capacity of the expansion section, so that the entire system will not be inflated. The setting of the segment affects the rated ampacity of the entire line.
The expansion range of the expansion section can be adjusted from 0 to 150 mm. It can absorb the aluminum material of the slide guide rail. The expansion point distance is 150 meters. When the length of a single wire is less than 150 meters, it is recommended that no expansion section be used. When the ambient temperature is -40°C to 120°C, the expansion distance caused by the expansion coefficient causes the collector to pass smoothly without affecting the power supply quality.
What is MIG welding?
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The Metal Inert Gas (MIG) welding process forms an electric arc between a consumable wire electrode and the work piece. This heats the work piece metals so they melt and join. Both the wire electrode and a shielding gas are fed through the Welding Torch.
MIG welding is also known as also often known as either Gas Metal Arc Welding (GMAW) or Metal Active Gas (MAG) welding.
What are the benefits of MIG welding?
Simplicity – MIG welding is quick and easy to learn compared to TIG welding.
Versatility – can be used to weld a wide variety of metals.
Speed – welding is quick compared to TIG welding.
Automation – easy to adapt for robotic automation
What are the disadvantages of MIG welding?
Limitations on location – MIG welding is not suitable for outside use because the volatility of the air can disperse the shielding gas.
Quality – MIG welding can produce more quality problems than TIG welding, the main ones being dross and porosity which can cause weaker welds.
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