I. Hardware System Optimization
1. Temperature Sensor Configuration
Use K-type thermocouples (±0.5°C accuracy) and infrared thermometers for dual redundant monitoring, with one measurement point every 50 cm². Sensors require regular calibration (recommended every three months) to prevent drift errors.
2. Heating Module Design
Zone-controlled PID control of the heating plate (e.g., 6 independent temperature zones) ensures a temperature difference of less than ±3°C on the workbench.
Ceramic heating plates (800°C temperature resistance) are used instead of traditional resistance wires to improve response speed.
II. Control Strategy Implementation
1. PID Parameter Tuning
Set the proportional coefficient (Kp) to 2.5-3.0, the integral time (Ti) to 30-60 seconds, and the derivative time (Td) to 5-10 seconds.
For laser welding scenarios, feedforward control is required to compensate for thermal inertia.
2. Dynamic Compensation Mechanism
Real-time monitoring of ambient temperature (e.g., fluctuations in workshop air conditioning) is used to compensate for ±2°C deviations using an algorithm. Avoid heat sink blind spots on the worktop when planning the welding robot's path.
III. Process Parameter Matching
1. Temperature Curve Setting
Preheating Phase: 1.5-2.0°C/second to 150°C (avoid thermal shock)
Soldering Phase: Peak temperature 235-245°C (lead-free solder), duration 30-90 seconds
2. Material Compatibility
Allow thermal expansion clearance for cast iron worktops (0.2mm per meter of length).
Use high-temperature, anti-rust lubricant (operating temperature range -30-300°C).
IV. Maintenance and Calibration
1. Daily Inspection
Check the cooling system (water temperature 30-50°C) and thermocouple connections daily.
Clean weld slag from the worktop weekly (to avoid localized thermal resistance changes).
2. Periodic Calibration
Verify sensor accuracy monthly using a standard temperature source (replace if error > 1°C).
Recalibrate PID parameters quarterly (adjust based on solder joint quality feedback).
