Method and device for producing welded reinforcing meshes with high strength and expansion values
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Solution Overview
Problem
Hot-rolled and cold-rolled steel wires used for concrete reinforcement meshes face issues with high carbon content leading to inadequate ductility and weldability, and excessive material compression respectively, making it difficult to meet strength and elongation standards for welded wire meshes.
Innovation Solution
The method involves stretching both longitudinal and transverse wires using capstan drums and bending rollers to increase strength and ductility, ensuring wires are fed as a bundle to the welding machine, allowing for continuous production of steel wire mesh mats with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot-rolled wire material with high carbon content is used to achieve necessary strength, then yield point is improved, but weldability deteriorates due to martensitic microstructure development
Solution Approach 1:
The patent changes the physical state and microstructure of the wire through controlled stretching and heat treatment processes. By applying tensile stress and subsequent thermal processing, the wire achieves high strength through strain hardening and microstructural transformation without requiring high carbon content, thereby maintaining weldability
Solution Approach 2:
The patent creates a composite structure within the wire by combining different microstructural phases through the stretching and heat treatment process. The resulting wire exhibits a composite microstructure that provides both high strength and good ductility, eliminating the need for high carbon content alloys
2Ease of manufacture
If alloy additions such as Vanadium or Niobium are used to maintain low carbon content and ensure weldability, then weldability is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses physical processing parameters (stretching ratio, heat treatment temperature and time) to achieve the desired material properties instead of chemical composition changes. This eliminates the need for expensive alloying elements while maintaining weldability and achieving the required strength levels
Solution Approach 2:
The patent replaces expensive alloying elements with a cost-effective mechanical and thermal processing approach. The stretching and heat treatment process achieves the desired material properties using relatively simple and inexpensive equipment compared to expensive alloy additions
3Strength
If cold-rolled wire material is used to achieve necessary strength, then yield point is improved, but ductility deteriorates due to excessive material compression
Solution Approach 1:
Instead of using compressive rolling to strengthen the wire (which reduces ductility), the patent applies tensile stretching to achieve strength enhancement. This inverted approach—stretching rather than compressing—the wire creates strain hardening and microstructural refinement that increases strength while preserving or even improving ductility
Solution Approach 2:
The patent changes the deformation mode from compressive (rolling) to tensile (stretching). This parameter change in the deformation type fundamentally alters the microstructural evolution, allowing strength enhancement through dislocation density increase and grain refinement without the severe ductility loss associated with cold rolling
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 process enhances the strength and elongation properties of the wires, enabling compliance with standardized strength and ductility requirements while ensuring weldability and cost-effectiveness by reducing carbon content and material compression.
Implementation Method 1
the longitudinal wires are drawn through the stretching device by means of a capstan drum
Implementation Method 2
the wires are stretched in the longitudinal direction (stretching process)
Implementation Method 3
resistance welding to form concrete reinforcement mats
Data Source
AI summary
Method for the continuous production of mesh mats made of steel wire having a plurality of parallel longitudinal wires that are welded to transverse wires extending in a manner spaced apart from one another, wherein hot- or cold-rolled wire material is used as the longitudinal and transverse wires, wherein the longitudinal wires are stretched in a stretching apparatus while being fed to the welding operation, wherein the longitudinal wires are drawn through the stretching apparatus by means of a capstan drum, and wherein the transverse wire material is also stretched in a separate stretching apparatus while being fed to the welding operation, and an installation for carrying out the method.