Pre-Stressed Steel Sheet Weld Layout for Reduced Welding Deformation
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Solution Overview
Problem
Existing steel materials face challenges with welding deformation and reduced bending performance, especially when using thin materials, which can lead to structural inefficiencies and increased costs.
Innovation Solution
A pre-stressed steel sheet is developed with a base material and multiple weld lines, where the average spacing between weld lines is optimized to enhance compressive stress distribution and improve bending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If thin materials are used for members with reduced thickness, then weight is reduced, but welding deformation increases
Solution Approach 1:
The patent applies pre-stress to the steel sheet before welding, creating initial compressive stress that counteracts the tensile stress generated during welding. This preliminary action prevents welding deformation from occurring in the first place, eliminating the need for post-weld correction while maintaining thin material usage
2Strength
If pre-stress is applied to steel material, then bending performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the stress state parameter of the steel sheet by applying pre-stress through controlled rolling. This transforms the material's internal stress distribution, creating compressive stress in the surface layers that improves bending performance. The parameter change is achieved through a relatively simple rolling process rather than complex prestressing equipment
Solution Approach 2:
The patent replaces traditional mechanical prestressing methods (such as external loading devices or post-tensioning systems) with a rolling process that induces pre-stress during manufacturing. This substitution simplifies the manufacturing system by integrating the prestressing function into the existing rolling operation
3Strength
If additional steel is bonded to high-strength steel beam, then load resistance is increased, but structure thickness increases
Solution Approach 1:
The patent changes the stress distribution parameter within the steel sheet itself by creating a pre-stressed state with compressive stress in the surface layers. This internal parameter change allows the same steel sheet to provide both structural strength and resistance to welding deformation without adding external layers or increasing thickness
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 pre-stressed steel sheet exhibits improved bendability and reduced welding deformation, effectively addressing structural inefficiencies and enhancing the bending performance of structural members like girders and beams.
Implementation Method 1
a compressive residual stress corresponding to the tensile residual stress generated by the contraction of the weld material is applied to the base material
Implementation Method 2
correction rolling the base material on which the weld line is formed
Data Source
AI summary
The present disclosure provides a pre-stressed steel sheet comprising: a base material; and a plurality of weld lines formed on the base materials, wherein the average spacing between each pair of the weld lines is equal to or greater than five times the width of the weld lines and equal to or less than half the width of the steel sheet.