Laminar Panel Welded Joints Fire Resistance
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Solution Overview
Problem
Current shipbuilding methods for constructing sound-insulating panels using constrained layer damping require extensive on-site manual work and are vulnerable to failure during fires due to disintegration of the intermediate visco-elastic layer, leading to delamination and reduced structural integrity.
Innovation Solution
A laminar construction panel method involving two metal plates with a visco-elastic layer in between, connected by locally welded joints distributed over the surface, using stud or spot welding techniques to maintain stability and prevent delamination during fires without compromising the structural integrity or increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intermediate visco-elastic layer is used for sound insulation, then damping properties are improved, but fire resistance deteriorates due to disintegration and delamination
Solution Approach 1:
The panel is divided into multiple segments (metal plates) connected by discrete welded joints rather than a continuous adhesive layer. This segmentation allows the structure to maintain integrity through mechanical connections that remain stable during fire, while still providing damping through the visco-elastic layer under normal conditions.
Solution Approach 2:
The invention uses a composite structure combining metal plates with a visco-elastic intermediate layer, where the metal plates provide fire resistance and structural stability, while the visco-elastic layer provides damping properties. The locally welded joints create a hybrid connection system that leverages both adhesive and mechanical bonding mechanisms.
2Ease of manufacture
If on-site manual assembly with adhesive tiles is used, then ease of manufacture is improved, but productivity deteriorates due to extensive manual work
Solution Approach 1:
The invention merges the sound insulation layer and the metal plates into a single pre-assembled laminar panel with integrated welded joints. This combining of components into a unified structure eliminates the need for separate on-site assembly steps, allowing the entire damping system to be installed as one unit, thereby significantly improving productivity while maintaining ease of installation.
3Weight of stationary object
If the total thickness of the plate assembly is reduced, then weight is reduced, but structural integrity deteriorates
Solution Approach 1:
The invention uses a thin visco-elastic intermediate layer (thinner than 1 mm) between the metal plates. This thin film provides the necessary damping function and bonding while minimizing thickness and weight addition. The mechanical strength is maintained through the locally welded joints that create rigid connection points, allowing the thin intermediate layer to suffice without compromising overall structural integrity.
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
The method significantly enhances damping properties and noise reduction while reducing labor and weight, ensuring structural integrity and fire resistance by creating mechanical connections that maintain panel stability even if the intermediate layer disintegrates.
Implementation Method 1
a welding current flows through the welding pin and the first metal plate, thereby melting and joining together the metal of the welding pin and the first metal plate by that welding current
Implementation Method 2
a welding current flows through the welding pin and the first metal plate, thereby melting and joining together the metal
Data Source
Figure 1a~1h
Figure 2a~2f
Figure 3a~3f
AI summary
Method for manufacturing a laminar construction panel comprising a first metal plate (1), a second metal plate (2), and an acoustic insulation layer (3) interposed there between. The first metal plate and the second metal plate are connected to each other by means of a number of locally welded joints, that are distributed over the laminar construction panel, and which extend through the area of the acoustic isolation layer. The welded joints are formed by means of stud welding, wherein one of the metal plates is provided with welding openings (4), and a welding pin (7) is pushed through the isolation layer, against the other metal plate. The welded joints may also be formed by means of spot welding, wherein both metal plates are brought into electrical connection with the spot welding equipment, and the metal plates locally are pressed toward each other in such a way that mutual electrical contact is made.