Sheet Metal Weld Slot Geometry for Crack-Resistant Joints
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Solution Overview
Problem
Welds in arrangements of parts, such as those in exhaust systems, experience force peaks due to mechanical loads and thermal expansion, leading to premature cracking and damage, particularly at the ends of the welds.
Innovation Solution
A slot is strategically designed in the first sheet metal part adjacent to the weld, with a shape that uncouples the end of the weld from the flow of forces, reducing force peaks by diverting the force flow around critical areas, including the weld and slot ends, thereby distributing stress more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welds extend along a portion of the edge to join sheet metal parts, then the structural connection is achieved, but force peaks develop at the weld ends due to the notching effect, leading to premature cracking and reduced reliability
Solution Approach 1:
The invention introduces slots that segment the continuous force flow path through the sheet metal part. By creating discontinuities in the force transmission path at critical locations (near weld ends), the slots prevent the concentration of stresses that would otherwise lead to cracking, while maintaining the overall structural integrity through the welded connection.
Solution Approach 2:
The slots act as intermediary elements that modify the force flow between the weld and the rest of the structure. Rather than allowing direct force transmission that creates stress peaks at weld ends, the slots intercept and redirect the force flow, protecting the vulnerable weld end regions from damaging stress concentrations.
2Duration of action of stationary object
If expensive materials and manufacturing methods are used to increase part lifetime, then durability is improved, but manufacturing cost increases
Solution Approach 1:
The slots are designed and positioned in advance during the manufacturing process to preemptively address the force flow issues before they can cause damage during service. By pre-configuring the force path modification features, the structure achieves enhanced durability through design rather than through expensive materials or post-manufacturing treatments.
Solution Approach 2:
The invention changes the geometric parameters of the sheet metal part by introducing slots with specific shapes and positions. This geometric modification alters the force distribution parameters, reducing stress peaks without requiring changes in material properties or manufacturing processes, thereby maintaining cost-effectiveness while improving 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.