Dongfeng KC Left lower foot pedal bracket welding assembly 8405349-C4106

The assembly adopts a welded integrated structure composed of three key components: a main support plate (4mm thick Q235 carbon steel), a reinforcement rib (3mm thick Q345 low-alloy steel), and a pedal mounting plate (5mm thick Q235 steel). All welding joints are processed via semi-automatic CO₂ gas shielded welding (weld leg height: 6mm), with no porosity, slag inclusion, or incomplete fusion—passing ultrasonic flaw detection (UT) tests to ensure weld strength. After welding, the entire assembly undergoes stress relief heat treatment (at 600-650℃ for 2 hours) to eliminate internal welding stress, preventing deformation during long-term use

Base Material: The Q235 and Q345 steel components feature a minimum tensile strength of 440MPa and yield strength of 235MPa, providing sufficient load-bearing capacity to withstand up to 800N of pedal pressure (meeting the maximum foot force of heavy-duty truck drivers).Surface Treatment: The assembly undergoes a three-step anti-corrosion process: Degreasing and pickling to remove oil and rust; Zinc phosphate conversion coating (film thickness: 8-12μm) for enhanced paint adhesion; High-temperature electrostatic spray painting (epoxy polyester powder, film thickness: 60-80μm) with a glossiness of 60±5% and pencil hardness of ≥2H. This coating system resists salt spray corrosion for over 500 hours (per GB/T 10125-2021 standards), effectively preventing rust caused by road salt, rainwater, and mud in harsh operating environments

The assembly is designed to meet Dongfeng’s heavy-duty truck safety standards for pedal systems (DFM-S-007-2022) and undergoes rigorous performance testing:

Static Load Test: Withstands a 1,200N static load (1.5 times the maximum design load) for 12 hours without permanent deformation or weld cracking.

Fatigue Test: Undergoes 100,000 cycles of dynamic load (300-600N) simulating repeated pedal operation, with no structural damage or functional failure—ensuring long-term reliability for high-frequency use in long-haul transportation.

Impact Test: Resists a 50J impact load (simulating accidental foot impact) without cracking, protecting the pedal linkage from damage and maintaining normal pedal operation

Mounting Design: The assembly features pre-threaded mounting holes (M10×1.5, depth: 15mm) that align perfectly with the original chassis bolts, and includes 4 high-strength hexagon head bolts (8.8-grade, zinc-plated) for direct installation. No additional tools beyond a torque wrench (recommended torque: 45-50N·m) are needed, allowing professional technicians to complete replacement in 25-30 minutes.Component Compatibility: It is fully compatible with Dongfeng KC’s original left lower foot pedal (Part No. 8405350-C4100) and pedal bushing, ensuring seamless integration with the existing pedal system—no modifications to the pedal linkage or control mechanism are required.Marking & Quality Assurance: Each unit is laser-engraved with the part number (8405349-C4106) and production batch code for traceability, and is backed by a 12-month warranty against manufacturing defects