Titanium-Gold Bimetal Watch Component Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacture of external timepiece components using noble metals like gold or platinum results in heavy and expensive products with limited mechanical qualities, and existing methods fail to effectively combine corrosion resistance with desirable mechanical properties.
Innovation Solution
A method involving a metallic base made of titanium and/or titanium alloy, combined with a metallic cover plate of gold, platinum, or palladium, where both are welded together at a temperature higher than their melting points to form a bimetallic blank, which is then shaped and machined to create a structural component with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metals (gold or platinum) are used for external timepiece components, then corrosion resistance is improved, but weight increases and cost increases
Solution Approach 1:
The patent applies composite materials by combining a titanium base (providing light weight and strength) with a noble metal cover plate (providing corrosion resistance and aesthetic appearance). This bimetallic construction allows the component to achieve the corrosion resistance of noble metals while maintaining the light weight of titanium, effectively resolving the contradiction between corrosion resistance and weight.
2Reliability
If noble metals (gold or platinum) are used for external timepiece components, then corrosion resistance is improved, but cost increases
Solution Approach 1:
The composite bimetallic structure allows only the outer cover plate to be made of expensive noble metals, while the bulk of the component (the base) is made of inexpensive titanium. This significantly reduces the quantity of noble metals required compared to using solid noble metal components, thereby reducing cost while maintaining corrosion resistance.
Solution Approach 2:
The noble metal cover plate is applied only where needed for corrosion resistance and aesthetic appearance (the external surface), rather than throughout the entire component. This local application of expensive material reduces overall cost while maintaining the required performance characteristics at the surface.
3Strength
If gold alloys are used to improve mechanical qualities, then mechanical strength is improved, but corrosion resistance worsens
Solution Approach 1:
The bimetallic construction separates the functions of mechanical strength and corrosion resistance to different materials. The titanium base provides superior mechanical strength and structural integrity, while the noble metal cover plate provides excellent corrosion resistance. This avoids the need to use compromised gold alloys that sacrifice corrosion resistance for mechanical strength.
Solution Approach 2:
Each material is used in the region where it provides its optimal performance: titanium in the structural base where mechanical strength is critical, and noble metal in the cover plate where corrosion resistance is critical. This local optimization resolves the contradiction by allowing each material to excel at its designated function.
4Ease of manufacture
If brazing is used to assemble titanium and gold components, then assembly is achieved, but gold penetration into titanium occurs requiring additional surface treatments
Solution Approach 1:
The welding process utilizes phase transitions (melting and solidification) to create a metallurgical bond between the titanium base and noble metal cover plate. By heating above the melting points of both materials and then controlled cooling, a strong joint is formed without the intermediate layers required by brazing, eliminating gold penetration issues.
Solution Approach 2:
The patent replaces the brazing process (which relies on filler metals and intermediate layers) with direct welding. This substitution eliminates the need for complex surface treatments and intermediate layers, achieving a cleaner interface and better manufacturing precision while maintaining assembly capability.
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 approach results in a lighter, corrosion-resistant, and aesthetically pleasing timepiece component that balances mechanical strength with reduced weight and cost, while maintaining excellent corrosion resistance.
Implementation Method 1
by bringing said cover plate and said base to a temperature higher than the melting temperature of said cover plate and than the melting temperature of said base
Implementation Method 2
by bringing said cover plate and said base to a temperature higher than the melting temperature of said cover plate and than the melting temperature of said base
Implementation Method 3
said at least one cover plate is welded to said base so as to form a bimetallic blank
Data Source
AI summary
A method of manufacturing an external timepiece component, including: a metallic base made of a first material including titanium and/or a first titanium alloy; at least one metallic cover plate made of a second material, this second material including a second metal selected from among gold and platinum and palladium, and/or a second alloy including at least gold or platinum or palladium, this at least one cover plate being of a thickness greater than or equal to 0.5 millimeters; the at least one cover plate is welded to the base to form a bimetallic blank; and the bimetallic blank is shaped and/or machined to give the structural component its final form.