Clinched Pipe Edge Compression for Corrosion-Protected Seams
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Solution Overview
Problem
Clinched pipes face edge corrosion issues due to coating damage during the cutting process, which compromises their corrosion protection, especially in corrosive environments, and existing solutions like cathodic protection or additional coating are complex and costly.
Innovation Solution
A method involving a clinched tube with a corrosion protection coating, where the longitudinal edges are compressed using a forming roller to reduce gaps and ensure at least 80% contact, minimizing exposed areas and maintaining coating integrity through controlled thickness reduction up to 30%, thereby preventing edge corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the tube is cut to length, then the desired component length is achieved, but the cut edges become stripped and vulnerable to edge corrosion
Solution Approach 1:
The tube is coated with corrosion protection coating before the cutting process. This preliminary coating ensures that the cut edges, which would otherwise be stripped and vulnerable, are protected from corrosion before they are exposed by cutting.
Solution Approach 2:
A corrosion protection coating is applied in advance to the tube surface, creating a protective barrier that cushions the cut edges against corrosive environments before they are vulnerable to attack.
2Strength
If welding is used to join pipes, then thermal joining is achieved, but the coating is interrupted or damaged by the weld seam and heat-affected zone
Solution Approach 1:
The harmful welding process that damages the coating is extracted/replaced with a mechanical joining method (clinching) that does not involve heat or chemical reactions, thereby preserving the integrity of the corrosion protection coating.
Solution Approach 2:
The thermal/mechanical-chemical welding process is replaced with a purely mechanical joining system (clinching) that physically interlocks the tubes without affecting the coating through heat or chemical reactions.
3Object-affected harmful factors
If subsequent coating of the seam or complete batch galvanizing is applied, then corrosion protection is improved, but the process becomes complex and expensive
Solution Approach 1:
The corrosion protection coating is applied in advance to the tubes before they are joined by clinching. This eliminates the need for subsequent coating of seams or complete batch galvanizing, simplifying the overall process while maintaining effective corrosion protection.
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 reduces edge corrosion and enhances the roundness of clinched pipes by ensuring continuous coverage of the corrosion protection coating, making them suitable for use in corrosive environments.
Implementation Method 1
compressing the tube at least in sections in the radial direction by means of at least one forming roller in a flow-forming system
Data Source
Figure 1~2
AI summary
The present invention relates to a method for manufacturing a corrosion-protected component (B) according to claim 1.