Insert Assembly With Decoupling Zone for Dissimilar Material Welding
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Solution Overview
Problem
Existing methods for multi-material assemblies, such as those in land and air transport, face challenges in easy, economical, and durable fastening of parts with different properties, often leading to high material costs, weight increase, and performance degradation due to aging or complex implementation with existing techniques like spot welding.
Innovation Solution
A method using an insert with a decoupling zone for electric resistance welding, allowing robust and cost-effective assembly of dissimilar materials by integrating the insert into one part before or after shaping, and fixing it to another part using electric resistance welding, with a thermally insulating cavity to prevent material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If welding patches are used to enable multi-material assemblies, then adaptability to join dissimilar materials is improved, but weight and material costs increase due to large dimensions
Solution Approach 1:
The welding patch is segmented into two distinct parts: a head portion for electrode contact and a body portion for insertion into the workpiece. This segmentation allows each part to be optimized independently - the head can be larger for proper electrode positioning while the body can be smaller to minimize weight and material usage, directly resolving the contradiction between adaptability and weight.
Solution Approach 2:
Different materials are used for different parts of the welding patch - the head is made of a material optimized for electrical contact and heat dissipation, while the body is made of a material optimized for mechanical insertion and minimal weight. This local quality differentiation allows the patch to perform multiple functions efficiently without requiring the entire structure to be oversized, thus reducing overall weight while maintaining multi-material joining capability.
2Ease of operation
If welding patches with large diameter are used, then ease of operation for electrode positioning is improved, but heat dissipation increases reducing welding efficiency
Solution Approach 1:
By separating the welding patch into head and body portions, the head can be designed with sufficient size for easy electrode positioning and alignment, while the body portion that contacts the workpiece can be minimized in size. This segmentation concentrates the welding heat at the workpiece interface rather than dissipating it across a large surface area, thus maintaining ease of operation while reducing energy loss.
Solution Approach 2:
The welding patch head acts as an intermediary between the welding electrode and the workpiece. It provides a stable, easily positionable interface for the electrode while transmitting heat efficiently to the workpiece through the inserted body portion. This intermediary structure decouples the positioning function from the heat transfer function, allowing optimal performance of both without compromise.
3Ease of manufacture
If welding patches are integrated into parts by drilling large holes, then ease of manufacture is improved, but strength of the receiving part decreases
Solution Approach 1:
The welding patch body is designed as a separate insertable component rather than requiring a large through-hole. The segmented design allows the body to be inserted through a smaller, more carefully sized opening that maintains the structural integrity of the receiving part, while still providing adequate access for integration. This resolves the contradiction by enabling manufacture without compromising strength.
Solution Approach 2:
The welding patch body is designed to nest within a recess or cavity in the receiving part rather than requiring a large through-hole. This nesting approach allows the patch to be securely integrated while minimizing the volume of material removed from the receiving part, thereby preserving its strength and structural properties while still enabling easy manufacture through standard recess-forming processes.
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
Enables efficient multi-material assembly with reduced material costs and weight, while minimizing heat transfer to the first part, particularly beneficial for plastic or composite materials, and maintaining assembly integrity.
Implementation Method 1
a decoupling zone (50) is formed at least around an end part (322) of the body (32) of the insert (30) by shaping the first part (10) or the second part (20). The decoupling zone (50) limits heat transfer during the fastening step
Implementation Method 2
the end part (322) of the body (32) of the insert (30) is fixed to the second part (20) by electric resistance welding
Implementation Method 3
fixing it to another part using electric resistance welding
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~4
AI summary
This method allows the assembly of a first part (10) and a second part by means of an insert (30) comprising a head (31) intended for resting on the first part (10) and a body (32) comprising an end portion (322) intended for being welded to the second part. The method comprises, before attaching the end portion (322) of the body (32) of the insert (30) to the second part, a step of shaping the first or second part (10) in order to form an uncoupling zone (50) around said end portion (322).