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Repair of high current busbar hardware terminals in power station

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Application case overview

Preparing a conductive silver layer on the surface of aluminum can effectively reduce its contact resistance and improve its conductivity. Electroplating silver is the most common way to prepare conductive silver layers, but the bonding strength of electroplated silver is low, the service life is short, and the silver electroplating process will have a greater impact on the environment.

Laser online in-situ silver coating repair of high-current busbar hardware terminals of power station generators:

Our company’s laser cladding silver technology on aluminum plates can effectively solve the above problems and has the following advantages:

  • The electrical conductivity of laser laser-cladding silver layer is better than that of the electroplated silver layer;
  • The laser cladding silver layer is metallurgically combined with the aluminum matrix to completely solve the problems of wrinkling and peeling. The thickness is greater than that of the electroplated silver layer. The quality is stable and reliable, and the service life is longer;
  • The laser cladding silver layer is green and environmentally friendly and has no pollution to the environment;
  • The workpiece can be processed on-site to avoid complicated disassembly and assembly work and save maintenance costs.

Closed busbar vertical section before repair

Metal Fitting Terminal and Copper Claw

On-site repair under way

Repair process

After repair

Metallographic picture after repair

Repair effect-Laser cladding silver coating Resistance value: laser cladding silver layer < original silver plating layer High current temperature rise test: the temperature rise of laser cladding silver is generally 3-4K smaller than the temperature rise of silver plating

Repair effect-The silver coating thickness after polishing is 350μm, Ra0.8pm

Repair effect

Repair effect