Online Heat Treatment Integration in ERW Processes

The decision to incorporate inline heat treatment depends on material specifications and end-use requirements.

Normalizing Applications

• API 5L pipe specifications

• Pressure vessel components

• Structural members requiring enhanced toughness

Annealing Requirements

• Cold-worked materials requiring recrystallization

• Stainless steel weld seam restoration

• Copper alloy stress relief

System Configuration
Induction heating coils immediately follow the weld point. Temperature control systems maintain precise thermal profiles through PID controllers. Cooling sections utilize air or water mist systems depending on material requirements.

Operational Parameters

• Heating temperature: 700-950°C

• Retention time: 15-90 seconds

• Cooling rate: 2-20°C/second

• Atmosphere control: Nitrogen shielding for oxidation prevention

Quality Verification
Hardness testing across the weld zone ensures proper heat treatment. Microstructure examination verifies grain size and phase distribution. Impact testing confirms toughness properties meet specification requirements.