Motor Vehicle Sheet Assembly for Corrosion-Resistant Al-Steel Joining
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Solution Overview
Problem
Existing methods for joining aluminum and steel sheets in motor vehicle components face challenges in achieving a reliable and corrosion-resistant connection, as these materials are difficult to weld directly and are prone to corrosion due to electrochemical potential differences and air humidity accumulation.
Innovation Solution
A method involving a weldable element inserted into an aluminum sheet, with a steel sheet adhesively bonded and welded to it using resistance welding, accompanied by an adhesive reservoir to prevent moisture and air accumulation, and optionally utilizing vacuum suction, temperature control, and specialized adhesive properties to ensure complete filling of the joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weldable element is inserted into an aluminum sheet to connect aluminum and steel sheets, then the reliability of the connection is improved, but the joint may accumulate moisture and air humidity leading to corrosion
Solution Approach 1:
An adhesive is introduced as an intermediary substance between the weldable element and the aluminum sheet, and between the steel sheet and the aluminum sheet. The adhesive fills the joint spaces and creates a seal that prevents moisture and air humidity from accumulating in the joint, thereby eliminating the corrosion risk while maintaining the reliable connection provided by the weldable element and resistance welding.
2Ease of manufacture
If aluminum and steel sheets are directly welded, then the manufacturing process is simplified, but the welding reliability is poor due to material incompatibility
Solution Approach 1:
A weldable element made of steel with a coating is introduced as an intermediary component. This element can be reliably welded to the steel sheet through resistance welding, and the adhesive fills the gap between the weldable element and the aluminum sheet. This approach maintains manufacturing simplicity while significantly improving welding reliability by avoiding direct welding between incompatible aluminum and steel sheets.
3Object-affected harmful factors
If the joint between the weldable element and aluminum sheet is completely filled with adhesive, then corrosion protection is improved, but the device complexity increases
Solution Approach 1:
The adhesive is applied in advance to the weldable element or the aluminum sheet before the resistance welding operation. The weldable element is inserted into the aluminum sheet opening, and the adhesive is already in position to fill the joint. This preliminary application of adhesive simplifies the overall process by eliminating the need for complex post-welding sealing operations while ensuring complete joint filling for optimal corrosion protection.
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 approach provides a reliable and corrosion-resistant connection between aluminum and steel sheets by ensuring the joint is completely filled with adhesive, reducing the risk of corrosion and enhancing the structural integrity of motor vehicle components.
Implementation Method 1
An electric current is conducted at least by the joining element and the steel sheet in order to obtain a heating caused by resistance, whereby in the contact region of the joining element with the steel sheet a welding region is formed
Implementation Method 2
an adhesive is arranged between the metal sheets for adhesively bonding the metal sheets
Data Source
AI summary
A method for providing a component assembly for a motor vehicle includes inserting a weldable element into an opening of a first metal sheet such that a joint is defined between the weldable element and the first metal sheet and such that a reservoir connected to the joint is preserved at a first side of the first metal sheet that faces a second metal sheet where the reservoir is open in a direction toward the second metal sheet. The method further includes applying an adhesive to the first side of the first metal sheet and/or to the second metal sheet and placing the second metal sheet against the first metal sheet and the weldable element and welding the second metal sheet to the weldable element.