Corrosion-Resistant Flange with Hard-Faced Alloy Layer
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Solution Overview
Problem
Existing pressure measuring cells and transmitter devices face increased costs due to the need for special materials in flanges that come into contact with aggressive process media, making them expensive and complex to manufacture.
Innovation Solution
A flange made of standard metallic material, such as carbon steel, is hard-faced with a high-alloy special material like Hastelloy C276/2.4819 on the side facing the process medium, using a method involving pre-turning, applying metallic powder, welding, and finishing to desired dimensions, with the option of laser build-up welding for corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire flange is made of special high-alloy material to resist corrosion from aggressive process media, then corrosion resistance is improved, but manufacturing cost increases significantly
Solution Approach 1:
The flange is constructed with a dual-material structure where only the sealing area that contacts the process medium is made of special high-alloy material (such as Hastelloy C276), while the remaining flange body is made of standard carbon steel. This local application of corrosion-resistant material provides adequate protection where needed while significantly reducing overall manufacturing cost compared to using special material for the entire flange.
Solution Approach 2:
The flange combines two different materials - standard carbon steel for the base structure and special high-alloy material for the corrosion-prone sealing area. This composite construction allows each material to be used where it provides the most value, optimizing both cost and performance by leveraging the corrosion resistance of the high-alloy material only where necessary.
2Ease of manufacture
If only the exposed portions of the flange are made of special material, then manufacturing cost is reduced, but ensuring firm connection and intimate bonding between different materials becomes difficult
Solution Approach 1:
The special high-alloy material layer is welded directly onto the carbon steel flange base, creating a unified dual-material structure. This merging of materials through welding ensures a firm, intimate connection between the different materials, eliminating concerns about bonding strength while maintaining the cost advantages of using standard material for the majority of the flange.
Solution Approach 2:
Instead of relying on mechanical fastening or adhesive bonding methods to connect the special material layer to the flange base, the invention uses welding to create a metallurgical bond. This substitution of the connection method ensures superior connection strength and reliability between the dissimilar materials.
3Reliability
If a complex construction with separate insert and housing is used to achieve corrosion resistance, then material adaptation to process medium is improved, but device complexity increases
Solution Approach 1:
The invention integrates the corrosion-resistant material layer directly onto the flange base in a single unified structure, eliminating the need for separate inserts, housings, or membrane carriers that would be required in complex multi-component designs. This merging of components achieves the necessary material adaptation to aggressive process media while significantly reducing construction complexity.
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 provides a cost-effective, corrosion-resistant flange with a firm connection between standard and special materials, allowing for the use of the same material for the membrane, reducing complexity and costs while maintaining performance.
Implementation Method 1
the powder is welded onto the flange by a suitable welding process; the powder made of special material is whitened onto the flange by laser build-up welding
Data Source
AI summary
For a corrosion-resistant, yet cost-effective flange for pressure measuring cells or chemical seal devices, according to the invention the flange (10) essentially consists of a metal main body (12) made of a standard material and is armored on the side facing the process medium by a layer (14) applied there, which layer is made of a high-alloy special material.