Welded Sheet Metal Joint Stress Peak Reduction
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Solution Overview
Problem
In arrangements of parts joined by welds, force transfer through welds leads to force peaks at the ends, causing premature cracking and damage due to mechanical loads and thermal expansion, particularly in exhaust systems for internal combustion engines.
Innovation Solution
A slot is strategically cut in the first sheet metal part adjacent to the weld end, with a shape that either curves by at least 180 degrees or forms a C-shape, effectively uncoupling the weld end from the force flow, reducing stress peaks and allowing the use of less expensive materials and manufacturing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welds are used to join sheet metal parts, then the parts are securely attached, but force peaks develop at the weld ends leading to premature cracking and reduced reliability
Solution Approach 1:
A notched section is introduced as an intermediary element between the weld end and the main structure. This notched section acts as a stress breaker that interrupts the direct force flow, preventing stress concentration at the weld end while maintaining overall joint integrity. The notched section absorbs and redistributes forces, protecting the weld end from premature cracking.
2Reliability
If the lifetime of the arrangement is improved by reducing stress peaks, then more expensive materials or complex manufacturing methods may be required, but cost reduction is desired
Solution Approach 1:
The structure is segmented by introducing a notched section that divides the continuous force flow path. This segmentation allows the stress to be distributed across multiple sections rather than concentrated at the weld end. The notched section can be easily manufactured using standard punching or cutting operations, avoiding the need for expensive materials or complex manufacturing processes while still achieving extended component lifetime.
Data Source
AI summary
An arrangement of parts having a first part in the form of sheet metal which is in contact with the second part along an edge and is fixedly connected to the second part via at least one weld. To reduce stress peaks at the ends of welds, the first part has a slot in a section adjacent to the respective end of the weld, the slot beginning at the edge and extending to its end with a curved profile a curve bent by at least 180° up to its end.