The Flange Preheating Tunnel Oven is an industrial furnace system specially designed for continuous heating or preheating of metal flanges. It adopts a tunnel-type structure and uses conveying systems such as conveyor belts, roller conveyors, or push-rod mechanisms to continuously transport flange components through the heating zones, achieving the required process temperatures for welding, forging, thermal assembly, or coating preparation.

Applications

1. Preheating Before Welding

Used to preheat high-carbon steel and alloy steel flanges before welding.

Reduces the cooling rate during welding and helps prevent:

Welding cracks

Thermal stress concentration

Structural defects

2. Thermal Assembly Process

Utilizes the principle of thermal expansion.

The flange is heated to expand its inner diameter, making it easier to achieve interference fitting and secure assembly with:

Pipes

Shafts

Other mechanical components

3. Forging and Rolling Processes

Used for overall controlled heating before:

Flange forming

Forging

Precision machining processes

to improve material forming performance and processing quality.

4. Pre-Coating Heating and Drying

Used before:

Surface coating

Anti-corrosion treatment

to preheat flange surfaces and improve coating adhesion and durability.

Standards

GB/T 10067.1

Basic Technical Requirements for Industrial Electroheat Equipment

Specifies general technical requirements for industrial electric heating equipment design and manufacturing.

GB/T 10066.1

Test Methods for Electroheat Equipment

Provides testing and performance verification methods for industrial heating equipment.

JB/T 4311

Performance Evaluation of Batch and Continuous Resistance Furnaces

Defines performance evaluation requirements for resistance heating furnaces.

TSG 11

Safety Technical Regulations for Boilers

Applicable when the equipment involves related gas-fired or steam heating systems.

Features

1. Continuous Production Operation

The tunnel structure enables continuous flange feeding and heating, providing:

High production efficiency

Stable heating cycles

Compatibility with automated flange manufacturing lines

It is suitable for large-volume industrial production.

2. Precise Temperature Control

The equipment adopts:

Multi-zone independent temperature control

Optimized internal thermal circulation system

to ensure uniform heating of flange components and minimize temperature differences throughout the heating process.

3. Energy Saving and Environmental Protection

The furnace features:

Good sealing performance

Thick thermal insulation layers

Reduced heat loss compared with traditional batch box furnaces

Continuous operation also improves thermal utilization efficiency and reduces energy consumption per unit product.

4. Intelligent Operation Control

The system is usually equipped with:

PLC control system

Touchscreen interface

Temperature curve recording function

Production data export capability

allowing accurate process monitoring and traceability.

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