Hot-wire Consumable for Self-lubricating Weld Deposits
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Solution Overview
Problem
Traditional arc welding methods limit the composition of filler wires due to high temperature and arc dynamics, preventing the deposition of certain self-lubricating materials like graphite, which are desirable for reducing surface friction in weld joints.
Innovation Solution
A system and method using a filler wire composed of a base material with embedded self-lubricating materials like graphite particles or powder, heated by a high-intensity energy source such as a laser or hot-wire power supply, allowing for the deposition of these materials without the limitations of traditional arc welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional arc welding is used to deposit filler wire, then the welding process is simple and well-established, but the composition of filler wire is limited and self-lubricating materials like graphite cannot be deposited
Solution Approach 1:
The patent combines laser heating with hot-wire resistance heating in a single welding system. The laser provides primary heating of the workpiece and weld zone, while the hot-wire element provides additional localized heating of the filler wire, enabling the deposition of materials with extended composition ranges including self-lubricating materials that would otherwise be incompatible with traditional arc welding.
Solution Approach 2:
The patent introduces a hot-wire element as an intermediary heating mechanism between the laser and filler wire. This intermediary provides controlled resistance heating that complements the laser heating, allowing precise temperature control in the filler wire to enable deposition of temperature-sensitive materials while maintaining the benefits of laser welding.
2Productivity
If high temperature arc is used to melt filler wire, then welding process is efficient, but certain materials and compositions do not transfer easily or at all
Solution Approach 1:
The patent segments the heating process into two distinct stages: laser heating of the workpiece and weld zone, followed by localized hot-wire resistance heating of the filler wire. This segmentation allows each heating mechanism to operate at optimal temperatures for its specific function, avoiding the excessive temperatures of arc welding while maintaining high deposition efficiency.
Solution Approach 2:
The patent changes the temperature parameters of the welding process by replacing the high-temperature arc with laser heating combined with controlled hot-wire heating. This parameter change enables the deposition of temperature-sensitive materials including self-lubricating materials while maintaining efficient welding speeds and deposition rates.
3Reliability
If self-lubricating materials are added to filler wire for arc welding, then surface friction reduction is achieved, but materials are consumed by the arc rather than deposited
Solution Approach 1:
The patent converts the potential harm of high temperature arc consumption into benefit by replacing the arc with laser heating. The laser provides sufficient heating energy to melt and deposit self-lubricating materials without causing their consumption or degradation, thereby preserving these valuable materials in the weld deposit where they provide the desired friction-reducing properties.
Solution Approach 2:
The patent substitutes the mechanical/thermal arc welding process with a laser-based heating system. This substitution eliminates the consumptive nature of arc welding on self-lubricating materials while maintaining the welding function, allowing these materials to be deposited intact and retain their lubricating properties in the final weld joint.
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
Enables the deposition of self-lubricating materials throughout the weld joint, reducing surface friction and providing consistent low friction properties throughout the weld's thickness, even as it wears, without the materials being consumed by the arc.
Implementation Method 1
heated by a high-intensity energy source such as a laser or hot-wire power supply
Implementation Method 2
hot-wire power supply to heat at least one filler wire
Implementation Method 3
self-lubricating materials include at least one of graphite particles and graphite powder, or other materials that can decrease the surface friction of a weld joint or cladding layer as it wears
Data Source
AI summary
A filler wire (consumable) for depositing self-lubricating materials in a system for any of brazing, cladding, building up, filling, hard-facing overlaying, welding, and joining applications. The filler wire is composed of a base filler material consistent with commonly known compositions. For example, the base filler material can comprise standard materials used in many standard mild steel wires. In addition to the base filler materials, the consumable includes self-lubricating materials. The self-lubricating materials include at least one of graphite particles and graphite powder, and can include other self-lubricating materials.