1. Appearance and Structural Inspection
Exterior Integrity: Inspect the welding machine exterior for deformation, rust, or cracks, especially the socket joints. Significant wear or deformation may affect sealing and welding accuracy.
Connection Condition: Observe the power cord, gas line, and other connections for looseness or oxidation. Frequently experiencing poor contact may require replacement.
2. Electrical Performance Testing
Voltage and Current Stability: Use a multimeter to measure voltage fluctuations under no-load and load conditions. Exceeding the rated range (e.g., ±15%) may indicate deterioration of internal components.
Insulation Resistance: The insulation resistance should be ≥1.4 MΩ. Below this value, the machine should be dried or replaced.
3. Functional Performance Evaluation
Welding Quality: Weak welds, increased spatter, or weld porosity may indicate a problem with the welding tip or control module.
Cooling System Efficiency: Check the cooling water flow for stability. Poor water flow may cause overheating and shutdown. IV. Lifespan of Key Components
Torch Tip Wear: Replacement is required if the working surface is concave by more than 20% or if conductivity decreases (resistance increases significantly).
Internal Component Wear: If capacitors or transformers show signs of scorching or exhibit abnormal temperature rise (>120°C), they require immediate repair or replacement.
V. Maintenance Records and Cycles
Regular Inspection: For frequently used welding machines, a comprehensive inspection is recommended every six months, with parameter trends recorded to predict remaining lifespan.
Replacement Criteria: When two or more abnormalities occur simultaneously (e.g., performance degradation and component damage), replacement is recommended over repair.
