Introduction to the structure of plasma cladding equipment

Introduction to the structure of plasma cladding equipment

Plasma cladding equipment is a high-energy beam welding and surface strengthening technology equipment. Its core is composed of multiple systems, and has the characteristics of high temperature and high energy, fine control, and controllable melting depth. The main structure is as follows:

1. Plasma Torch System

• The core component uses an electric arc to ionize the working gas to form a high-temperature plasma arc.
  
• Includes anode, cathode, nozzle, water cooling system, etc.
  
• It can be divided into transferred arc, non-transferred arc or double arc structure.
  
• Provides a stable cladding heat source with a concentrated molten pool and a small heat-affected zone.
  
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2. Power system

• Dedicated plasma welding power supply, providing stable DC or pulse arc current.
  
• Control welding current, voltage, arc starting method and other parameters.
  
• It is usually equipped with a high-frequency arc ignition system to improve the arc ignition success rate.
  
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3. Powder supply system/wire feeding system

• Powder feeder or wire feeding device can be selected according to process requirements.
  
• Powder feeder: including spiral powder feeder, electromagnetic vibration powder feeder, etc., the powder feeding is uniform and stable.
  
• Wire system: suitable for wire cladding, equipped with synchronous wire feeding mechanism to accurately control wire feeding speed.
  
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4. Workpiece motion system (CNC platform or robot)

• Common forms include X/Y/Z three-axis CNC worktable, four-axis or six-axis robot system.
  
• Accurately control the movement path of the welding gun or workpiece to achieve complex curved surface or circumferential weld cladding.
  
• Support programming control, and can cooperate with CAD/CAM to automatically generate surfacing tracks.
  
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5. Cooling system

• It is mainly used for water cooling protection of high temperature parts such as welding gun, nozzle, cathode, etc.
  
• Prevent overheating damage, and increase welding gun life and cladding stability.
  
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6. Control system

• Integrate PLC or industrial control computer system.
  
• Realize synchronous control of multiple parameters, such as welding current, voltage, powder feeding amount, welding gun speed, etc.
  
• The human-machine interface is friendly and supports the storage and quick call of multiple process recipes.
  
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7. Protective gas system

• Commonly used shielding gases are argon, helium, etc., which are used to protect the molten pool from oxidation.
  
• Some processes use a dual-gas structure (plasma gas + shielding gas) to improve weld quality.
  
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8. Automatic height tracking system (optional)

• Arc voltage control or laser height sensing system is optional.
  
• Automatically adjust the distance between the welding gun and the workpiece to ensure the consistency of cladding quality.
  
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9. Safety protection system

• Including arc protection cover, protective gas sealing device, emergency power off system, etc.
  
• Meet the personal safety and equipment protection requirements in industrial environments.