Can automotive plastic molds be repaired using laser welding?

1, Principles of Laser Welding Technology
Using the heat produced by a laser beam, laser welding melts the plastic contact surface and bonds plastic parts together. The laser beam used in laser welding passes through the upper transparent material and is absorbed by the lower material, therefore focussing on the area to be welded. Whereas the heat is passed to the top layer material via thermal conduction, causing it to also melt, the absorbed laser energy is transformed into thermal energy, raising the temperature of the bottom layer material and melting it. The melted plastic produces a molten pool as the laser beam moves, cools and solidifies as the laser beam leaves to create a robust welded junction.
2, Feasibility of laser welding repair for automotive plastic molds
Mostly thermoplastic, such PS, PVC, PP, etc., which have strong laser welding compatibility, automotive plastic moulds are made of. Effective welding may be obtained by choosing the suitable type of laser and including laser sensitisers (like carbon black), thereby enhancing the absorption rate of plastic to laser. Furthermore appropriate for mending local or minor damage to the mould, laser welding has the qualities of non-contact welding, which will not mechanical harm the mould, and has great welding accuracy and rapid speed.
3, The advantages of laser welding in repairing automotive plastic molds
Great quality and accuracy: By exact control of the energy and laser beam path, laser welding guarantees the strength and sealing of the welded junction. Simultaneously, the weld seam meets the high standards for accuracy and quality of automobile moulds since it is beautiful and strong with features of sealing, no air leakage, and no water leakage.
Efficiency and automation: Laser welding offers fast speed and high degree of automation, hence improving repair efficiency. Furthermore advantageous for preserving a clean working environment is the minimum material deterioration during laser welding and the absence of essentially no waste.
Particularly for moulds with complicated structures or slight damage, strong adaptability of laser welding technology allows for the repair of moulds of various forms and sizes. Laser welding offers quick fixes.
Energy savings and environmental protection: By eliminating auxiliary gases or extra welding ingredients, laser welding lessens environmental pollution. Laser welding, on the other hand, uses a great energy consumption rate, which helps to save energy.
4, Practical application of laser welding repair for automotive plastic molds
Local m Mould damage repair: Local wear or cracks caused by mould usage can be precisely repaired by laser welding. The strength of the welded junction can be guaranteed to satisfy the criteria by changing the parameters of the laser welding equipment, such as laser power, pulse frequency, etc., thereby ensuring the compliance.
Modifying the mould size: Sometimes long-term use or wear and tear causes the mould to vary in size. By locally heating and melting the mould, then with exact size adjustment, laser welding may restore the mold's original size and accuracy.
Laser welding can be performed for mould surface alteration as well as for mould repair. The hardness and wear resistance of the mould surface can be raised by laser welding a thin layer of molten pool on its surface then fast cooling and solidifying.
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