Galvanized Steel Pipe Support Laser Marking
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Solution Overview
Problem
Existing galvanized tubular steel supports for construction formwork face challenges in legible marking and adjustment due to the zinc coating, which makes traditional marking methods like stamping or painting ineffective and time-consuming, and laser marking is complex and costly, especially on irregular surfaces with varying zinc thickness and white rust.
Innovation Solution
The solution involves using a laser to burn markings directly into the zinc layer of the galvanized tubular steel support, allowing for permanent, high-contrast markings without altering the tube geometry, and incorporating an automatic focusing system and traversing unit for efficient marking on varying pipe diameters and surfaces, with the option to remove the zinc layer for enhanced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If numbers are stamped into the slit strip during manufacturing, then the markings are permanently integrated into the tube structure, but the markings become illegible after hot-dip galvanizing because the zinc compensates for the punching depression
Solution Approach 1:
The patent applies preliminary action by performing the laser marking after galvanizing rather than before. The markings are created on the already-galvanized surface, avoiding the problem where zinc fills in stamped depressions. The laser burning process works effectively on the galvanized surface to create legible, permanent markings without being compromised by the zinc coating.
2Loss of information
If numbers are painted onto the finished galvanized pipe, then the markings are visible and legible, but the paint does not adhere to the smooth zinc surface and only lasts after the zinc surface has aged 3-4 weeks
Solution Approach 1:
The patent replaces the mechanical/chemical adhesion process of paint application with a thermal process using laser burning. Instead of relying on paint adhesion to the zinc surface, the laser directly burns the markings into the galvanized surface, creating permanent, heat-altered markings that are inherently bonded to the surface and do not require aging for adhesion.
3Reliability
If laser marking is used on galvanized surfaces, then permanent and legible markings are achieved, but the varying zinc thickness and white rust cause different reflection degrees that make laser power control difficult and may burn through the zinc layer
Solution Approach 1:
The patent implements feedback control by using a sensor to detect the actual surface conditions (zinc thickness, white rust presence, reflection degree) during the laser marking process. The control system continuously monitors these parameters and automatically adjusts the laser power in real-time, preventing zinc layer burn-through while ensuring consistent marking quality across varying surface conditions.
4Loss of information
If the zinc layer is completely removed by laser to enhance marking visibility, then the contrast and legibility are significantly increased, but the base material steel is exposed to moisture and rust may form
Solution Approach 1:
The patent applies local quality by creating highly localized markings that remove zinc only in the specific areas where numbers or markings are needed. The laser is precisely controlled to affect only the immediate marking area, leaving the surrounding zinc protective coating intact. This localized approach provides excellent legibility while maintaining rust protection across the majority of the surface.
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
This method provides permanent, legible, and uniform markings that resist rust, simplifies the marking process, and integrates well into series production, reducing production time and costs while maintaining surface protection.
Implementation Method 1
the numbers are burned into the zinc layer using a laser
Implementation Method 2
the zinc layer is completely removed ('burning through') and the base material becomes visible
Data Source
Figure 1
AI summary
A telescopic strut, e.g. for construction work, has the inner section with a series of holes, for a locking peg. The holes enable the operator is rapidly set the approximate length with fine adjustment via a threaded sleeve. The markings are applied to the inner section by laser beam. The zinc coating thickness is greatest under the markings.