Welded Blank Assembly Capping Layer for Contaminant Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of thin coating material layers on high-strength or hardenable steel alloys in sheet metal can contaminate welds, reducing weld strength and integrity, especially during butt welding or lap welding processes.
Innovation Solution
Forming weld notches along the edges of sheet metal pieces to remove certain constituents from the material layers, allowing for the creation of a weld joint that is substantially free from coating layer contaminants, and subsequently reapplying the removed material as a capping layer to protect the weld joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coating material layers are applied to sheet metal to improve corrosion resistance, then corrosion resistance is improved, but weld strength and integrity deteriorate due to contamination
Solution Approach 1:
The patent removes coating material from the weld area by forming a groove or notch along the weld line before welding. This extraction of the harmful coating layer from the specific weld zone allows for clean welding of the substrate metal while preserving the coating on the rest of the sheet metal for corrosion protection.
Solution Approach 2:
The patent applies different treatments to different areas of the sheet metal: the coating is removed locally at the weld zone to enable strong welding, while the coating is retained on the surrounding areas to provide corrosion resistance. This creates local quality differentiation where each area has the properties needed for its specific function.
2Strength
If coating material layers are removed completely to ensure clean welds, then weld strength is improved, but corrosion resistance deteriorates due to loss of protective coating
Solution Approach 1:
Instead of complete removal, the patent selectively extracts coating material only from the immediate weld zone through groove formation, leaving the coating intact on the rest of the sheet metal. This targeted extraction achieves clean welds while preserving the protective coating where it is still needed.
Solution Approach 2:
The patent creates local quality differentiation by maintaining coating presence in non-weld areas for corrosion protection while creating coating-free zones only where welding occurs. This ensures each area has the appropriate properties: clean metal for welding and coated metal for corrosion resistance.
3Manufacturing precision
If groove or notch is formed to remove coating material, then weld cleanliness is improved, but device complexity increases due to additional processing step
Solution Approach 1:
The patent replaces traditional mechanical methods of coating removal (such as grinding or scraping) with laser-based ablation or plasma techniques. This substitution provides more precise control over groove formation, reduces tool wear, and can be automated more easily, thereby reducing overall process complexity despite adding a specialized step.
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 enhances the quality and strength of weld joints by eliminating contaminants and using the removed material as a protectant, thereby improving the integrity and resistance of the welded blank assemblies.
Implementation Method 1
forming weld notches along edges of sheet metal pieces to remove certain constituents from the material layers
Implementation Method 2
welding the sheet metal pieces together to form a welded blank assembly
Data Source
Figure 1A~1C
Figure 2~4
Figure 5~6
AI summary
A welded blank assembly (200) includes a capping material (210) in a weld region (220) of the assembly. The capping material can help protect a weld joint (208) joining first and second sheet metal pieces (12, 112) together. At least one of the sheet metal pieces has a coating material layer (18) that is removed prior to forming the weld joint so that the coating material does not contaminate the weld joint. The removed coating material can be collected before the weld joint is formed and reapplied as part of the capping material after the weld joint is formed, effectively changing the coating material from a potential weld contaminant to a weld joint protectant. The capping material may also include additional material from a source other than the coating material layer.