Laser-Welded Tank Liner Joints for Strong Bonds Without Voids
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Solution Overview
Problem
Existing high-pressure gas tanks face issues with insufficient bonding strength at joint portions due to inadequate fusion during laser welding, and prolonged welding times risk void formation from overheating.
Innovation Solution
The tank design incorporates a first liner component with a heat-sealing layer containing an absorbent and a second liner component with high laser absorptance, ensuring sufficient bonding strength through controlled laser welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding time is extended to increase melting amount, then bonding strength is improved, but the laser-absorbing liner component is overheated and voids are generated due to burning or gasification
Solution Approach 1:
The patent applies local quality by creating different laser absorptance characteristics in different regions of the liner components. The first liner component has a laser-transmitting property (low absorptance) while the second liner component has a laser-absorbing property (high absorptance). This spatial differentiation of optical properties allows controlled heat distribution during welding, enabling sufficient melting at the joint while preventing excessive overheating and void formation in the absorbing component.
Solution Approach 2:
The patent employs composite material structure where the liner is composed of multiple components with different optical properties. The first liner component (laser-transmitting) and second liner component (laser-absorbing) form a composite structure that optimizes heat transfer during laser welding. This composite approach allows the laser energy to be distributed effectively through the transmitting component and absorbed controllably by the absorbing component, achieving proper fusion without harmful overheating effects.
2Device complexity
If laser welding is performed with a laser-transmitting liner component without absorber, then the component structure is simple, but the amount of fusion of the heat-sealing portion is insufficient
Solution Approach 1:
The patent applies local quality by creating different laser absorptance characteristics in different regions of the liner components. The first liner component has a laser-transmitting property (low absorptance) while the second liner component has a laser-absorbing property (high absorptance). This spatial differentiation of optical properties allows controlled heat distribution during welding, enabling sufficient melting at the joint while preventing excessive overheating and void formation in the absorbing component.
Solution Approach 2:
The patent uses the laser-transmitting first liner component as an intermediary that facilitates controlled heat transfer to the laser-absorbing second liner component. The transmitting component acts as a mediator that allows laser energy to pass through and be absorbed by the second component, enabling indirect heat transfer that prevents direct overheating while ensuring sufficient fusion at the heat-sealing portion.
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 design achieves robust bonding between liner components, maintaining integrity and preventing void formation, thereby enhancing the structural reliability of the tank.
Implementation Method 1
the bottom layer of the first joint portion is a heat-sealing layer containing an absorbent, the second joint portion includes an absorbent
Implementation Method 2
laser welding is performed in a state in which a laser-transmitting liner component and a laser-absorbing liner component are in contact with each other
Implementation Method 3
the laser-absorbing liner component is heated and melted, and the laser-transmitting liner component is thermally melted by heat transfer from the laser-absorbing liner component
Implementation Method 4
joint portions of a plurality of liner components are joined to each other by laser welding
Implementation Method 5
the amount of fusion of the heat-sealing portion that joins the liner components
Data Source
AI summary
The tank has a liner configured by joining a plurality of liner components, each of which is at least partially cylindrical, and a reinforcing layer arranged on the outer circumference of the liner. The plurality of liner components includes a first liner component having a first joint portion and a second liner component having a second joint portion. The first joint portion has a plurality of resin layers, and the bottom layer of the first joint portion is a heat-sealable layer containing an absorbent. The second joint portion contains absorbent material. The first joint portion is laminated on the second joint portion, and the first joint portion and the second joint portion are joined by a heat-sealing portion.