Steel Fuel Pipe Inner Surface Repair for Corrosion-Resistant Plating
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Solution Overview
Problem
Conventional steel fuel-conveying pipes for gasoline and diesel engines suffer from initial flaws like fine cracks, wrinkles, or weld defects on the inner surface, leading to incomplete surface treatment and reduced corrosion resistance.
Innovation Solution
A method involving mechanical cutting using a gun drill processing machine to remove initial flaws on the inner surface of the pipe, followed by ultrasonic flaw detection and surface treatment to ensure complete coverage of the plating solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical cutting is performed to remove initial flaws on the inner surface, then corrosion resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing mechanical cutting to remove initial flaws (fine cracks, wrinkles, weld defects) on the inner surface of the pipe before conducting the inner surface treatment (plating). This preliminary removal of defects ensures that the subsequent plating process can form a continuous, uniform protective layer without penetrating into underlying defects, thereby achieving complete corrosion protection. The cutting operation is performed at a predetermined depth to eliminate all potential flaw sites before surface treatment.
2Productivity
If inner surface treatment is performed without removing initial flaws, then manufacturing time is reduced, but plating quality deteriorates
Solution Approach 1:
The patent implements preliminary action by conducting mechanical cutting to remove initial flaws on the inner surface before performing the inner surface treatment (plating). This sequence ensures that the plating solution can uniformly coat the entire inner surface without being blocked by underlying defects such as fine cracks, wrinkles, or weld defects. As a result, complete and uniform plating coverage is achieved, preventing localized corrosion while maintaining efficient manufacturing throughput.
3Measurement precision
If ultrasonic flaw detection is implemented to detect initial flaws, then detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies mechanics substitution by replacing complex visual inspection or manual examination methods with ultrasonic flaw detection technology. Ultrasonic detection uses sound wave propagation and reflection principles to identify initial flaws (fine cracks, wrinkles, weld defects) on the inner surface of the pipe. This non-destructive testing method provides accurate detection of subsurface and surface defects without requiring physical access to the inner surface, thereby improving detection accuracy while avoiding the need for complex disassembly or invasive inspection procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively removes initial flaws, enhancing the corrosion resistance of the pipe by ensuring uniform plating and eliminating rust and corrosion, resulting in a high-quality fuel-conveying pipe.
Implementation Method 1
the inner peripheral surface of the pipe material is removed by mechanical cutting
Implementation Method 2
an ultrasonic flaw detection method may be preferably used as a means of detecting the initial flaw on the inner peripheral surface of the pipe material
Implementation Method 3
If the inner surface treatment (for example, Ni plating) is performed in a state in which any of these defects on the pipe's inner peripheral surface, in particular, a fine crack, wrinkle flaw, or weld defect part, is present
Data Source
Figure 1~2
AI summary
Provided is a method of manufacturing a high-quality steel fuel-conveying pipe that is highly resistant to corrosive fuel. The method is characterized by including screening and classifying a steel pipe material as one having an initial flaw (such as a fine crack, wrinkle flaw, or weld defect part) exceeding a preset threshold or one having the initial flaw not exceeding the preset threshold on the inner peripheral surface of the pipe material, removing the initial flaw on the inner peripheral surface of the pipe material having the initial flaw not exceeding the threshold by mechanical cutting, and subjecting the inner peripheral surface of the pipe material to a surface treatment such as Ni plating.