Metal-Plastic Tab Joining with Laser-Formed Heads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for joining metal and plastic materials in automotive structural components are either unsafe, risk damage to the plastic material, or are complex and costly, leading to increased production times and costs.
Innovation Solution
A method involving the creation of slots in plastic material and corresponding tabs in metal material, where the metal tabs are inserted and then locally melted using a laser beam to form an enlarged head, securely connecting the materials without thermal stress to the plastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional joining methods are used to connect metal and plastic materials, then the joint can be formed, but the plastic material is damaged or the joint is unsafe
Solution Approach 1:
The patent replaces conventional mechanical joining methods (screws, rivets, adhesives) with laser welding. The laser beam directly melts the metal tab to form an enlarged head that mechanically interlocks with the plastic slot, eliminating the need for separate fastening components and avoiding damage associated with mechanical fastening methods.
Solution Approach 2:
The patent changes the physical state of the metal tab by locally melting it with laser energy. This phase change from solid to molten and back to solid creates the enlarged head geometry, transforming the joining mechanism from mechanical insertion to thermally-assisted forming that secures the connection without damaging the plastic.
2Reliability
If complex joining operations are used to ensure safe joints, then joint reliability improves, but production time and costs increase
Solution Approach 1:
The patent combines multiple operations into a single integrated process: the tab insertion and laser welding are performed in one continuous operation. The laser system directly welds the protruding tab end within the slot, merging positioning, joining, and sealing functions into one step, thereby reducing production time while maintaining joint reliability.
Solution Approach 2:
The metal tab structure is designed to be self-securing through laser welding. The tab's own material, when melted and reformed into an enlarged head, creates the joint without requiring additional fasteners, adhesives, or complex multi-step procedures. This self-service approach simplifies the process and reduces production time.
3Strength
If laser beam is directed close to plastic material for welding metal tabs, then strong joints are formed, but plastic material undergoes thermal stress
Solution Approach 1:
The laser beam is precisely targeted only at the metal tab material that protrudes beyond the plastic slot, creating highly localized heating. This local quality approach ensures that thermal energy is concentrated where needed (the tab end) while minimizing heat diffusion to the surrounding plastic material, thus forming strong joints without subjecting the plastic to excessive thermal stress.
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 a reliable, high-force-resistant joint that is simple to produce, avoiding damage to the plastic material and minimizing production time and cost, suitable for creating hybrid components with open or closed sections.
Implementation Method 1
directing a laser beam above the end portion of each tab that protrudes beyond said portion of the element of plastic material, so as to locally melt the metal material of each tab
Data Source
AI summary
A method for joining a metal material element to a plastic material element, in particular a composite material including a plastic matrix reinforced with fibers for use in the construction of motor-vehicle components. The method involves providing one or more slots in a portion of the plastic material element. For each slot, a corresponding tab is provided in the metal material element, having a shorter width and length than a width and length of the slot. The metal material and plastic material elements are arranged in a position of mutual coupling where each tab is inserted through the corresponding slot and has an end portion protruding beyond said portion of the plastic material element. A laser beam is directed above the protruding end portion, so as to locally melt the metal material of each tab and create an enlarged head on each tab that is welded above the plastic material element.