Dongfeng Kinland truck parts Rear roof welding assembly 5701014-C0300

A core advantage of the 5701014-C0300 assembly is its exceptional load-bearing and impact-resistant performance, tailored to Kinland’s heavy-duty needs. It is fabricated from Q355ND low-alloy high-strength steel (5mm thick for main panels, 7mm for reinforced edges), which offers a tensile strength of 510MPa—capable of withstanding 4,500kg static load (e.g., snow accumulation on cab rear roofs) or absorbing 350J impact force (e.g., falling branches or debris on cargo box tops). The steel undergoes low-temperature toughness treatment, ensuring it resists brittle fracture in harsh winter conditions (-40°C) common in northern Kinland operating regions. For trucks hauling oversized cargo or operating in construction zones, this strength prevents rear roof deformation, protecting the cab interior (from water or debris) and cargo (from weather damage)

The 5701014-C0300 assembly features industrial-grade welding to guarantee long-lasting structural stability. It adopts gas metal arc welding (GMAW, MIG) with ER50-6 low-carbon steel wire, creating weld seams with a shear strength of 340MPa—matching the base steel’s performance to eliminate weak points. Each weld joint (total length 6,500mm) is inspected via X-ray and ultrasonic testing, ensuring zero defects (e.g., porosity, cracks) that could lead to joint failure under vibration or load. Weld edges are ground smooth to reduce stress concentration and prevent corrosion buildup, while 3D laser positioning (accuracy ±0.3mm) during welding ensures all reinforcing ribs and mounting brackets align perfectly. This precision ensures the assembly maintains structural integrity even after years of road vibration or heavy use, extending its service life to 8+ years

Built to withstand harsh operating conditions, the 5701014-C0300 assembly boasts a robust anti-corrosion system. First, it undergoes hot-dip galvanization (zinc coating thickness 70μm) to form a primary barrier against rust from rain, road salt, or industrial dust. Next, it receives an electrophoretic coating (E-coat, 25μm) that covers hidden areas (e.g., weld gaps, bracket inner surfaces) to prevent under-film corrosion—a common issue with generic rear roof assemblies. A final layer of acrylic topcoat (30μm) adds scratch resistance and UV protection, avoiding paint fading in prolonged sunlight. This multi-layer system passes 1,200-hour salt spray tests, ensuring the assembly remains rust-free even in coastal regions (high humidity) or areas with frequent deicing. For fleet operators, this protection minimizes maintenance costs and avoids premature replacement due to corrosion

The 5701014-C0300 assembly is designed for efficient installation, reducing Kinland truck downtime. It comes pre-welded with all necessary brackets (e.g., rear roof support brackets, seal mounting grooves) and pre-drilled mounting holes, eliminating on-site welding or drilling. The package includes 10.9-grade high-strength bolts (with lock washers) that match Kinland’s factory torque specifications (160-180 N·m), ensuring secure attachment to the rear roof framework. Installation takes 3-4 hours for a two-person team using standard tools (torque wrenches, impact drivers), and a detailed manual (with 3D assembly diagrams) guides alignment to ensure proper sealing with adjacent components (e.g., rear windshield, cargo box panels). Unlike custom-fabricated alternatives, this OEM assembly requires no post-installation adjustments, getting Kinland trucks back on the road faster for time-sensitive tasks like freight delivery or construction work