Subsea Cable Water Barrier Jointing by Solid-State Diffusion
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Solution Overview
Problem
Conventional lead-wiping methods for jointing subsea cables are wasteful, time-consuming, and dependent on skilled labor, posing safety risks and environmental concerns, while achieving inconsistent joint quality.
Innovation Solution
A solid-state diffusion process is used to bond water barrier layers of subsea cables, eliminating the need for solder and reducing labor time, forming strong, pure bonds without the handling of solder mixes, and ensuring a water-tight seal through atomic diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lead-wiping method is used to joint water barrier layers, then the joint can be formed with traditional materials, but the process is wasteful, time-consuming, and highly dependent on skilled labor experience
Solution Approach 1:
The patent replaces the mechanical lead-wiping process with a solid-state diffusion bonding process. Instead of manually wiping molten lead and solder onto the joint, the invention uses controlled diffusion of atoms across the interface between water barrier layers under heat and pressure, eliminating the need for manual intervention and skilled labor while significantly reducing process time
Solution Approach 2:
The patent changes the physical parameters of the bonding process by using solid-state diffusion under controlled temperature and pressure conditions. This transforms the traditional low-temperature manual process into a controlled thermal-diffusion process that achieves bonding without requiring skilled manual operation, thereby improving both simplicity and productivity
2Ease of manufacture
If conventional lead-wiping method is used, then traditional materials can be utilized, but the process poses safety risks and environmental concerns
Solution Approach 1:
The patent eliminates the hazardous manual handling of molten lead and solder by replacing it with a controlled solid-state diffusion process. This substitution removes the safety risks associated with hot metal handling and reduces environmental concerns related to lead waste, while maintaining jointing feasibility through a different physical mechanism
Solution Approach 2:
The invention uses an intermediate layer that is consumed during the diffusion process to create the bond. This intermediate material serves its purpose temporarily and is then diffused away, leaving a clean interface between the water barrier layers without requiring hazardous materials like lead and solder
3Reliability
If conventional lead-wiping method is used, then traditional bonding can be achieved, but the joint quality is inconsistent and dependent on technician experience
Solution Approach 1:
The patent replaces the skill-dependent manual wiping process with a controlled solid-state diffusion process where bond quality is determined by process parameters (temperature, pressure, time) rather than technician skill. This ensures consistent joint quality while maintaining or improving joint strength through the pure diffusion bond
Solution Approach 2:
The solid-state diffusion process is self-regulating in terms of bond formation. The diffusion of atoms across the interface automatically creates a uniform bond distribution without requiring manual intervention to ensure consistency. The process inherently produces reliable joints as long as the specified parameters are maintained
4Object-affected harmful factors
If solid-state diffusion process is used to bond water barrier layers, then waste is reduced and safety is enhanced, but the process requires controlled conditions and longer bonding time
Solution Approach 1:
The patent optimizes the duration by carefully controlling temperature and pressure parameters to accelerate the diffusion process. While solid-state diffusion inherently takes longer than manual wiping, the use of elevated temperatures and pressures significantly reduces the time required, making the process practical despite the longer duration compared to traditional methods
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 reduces waste, enhances safety, and achieves high-quality, fatigue-resistant joints with improved mechanical integrity and reduced environmental impact, while being less dependent on skilled labor.
Implementation Method 1
The method comprises the step of jointing the first and second water barrier layers, the jointing comprising the use of a solid-state diffusion process
Data Source
AI summary
A method of jointing a first subsea cable to a second subsea cable is provided. A first water barrier layer that surrounds a first cable core. The second subsea cable has a second water barrier layer that surrounds a second cable core. The method includes jointing the first and second water barrier layers. The jointing has the use of a solid-state diffusion process. Optionally, the jointing has bonding an intermediate water barrier to the first and/or second water barrier layers.