Hybrid Electroslag Cladding Single-Pass Chemistry Control
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Solution Overview
Problem
Current cladding techniques fail to achieve the required chemistry and grades efficiently, particularly for Nickel Base Alloy 625 and Stainless Steel, as they often require multiple layers and are costly due to dilution with unalloyed base metals, making it difficult to deposit a single pass cladding layer that meets weld overlay grade requirements.
Innovation Solution
A hybrid electroslag cladding method using a strip electrode and a metal cored hybrid electroslag wire, which allows for fast deposition of a single cladding layer with precise control of chemistry, utilizing a programmable logic controller to adjust parameters like feed speed and heat, enabling efficient deposition of Nickel and Stainless Steel alloys with reduced complexity and consumables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cladding techniques are used, then multiple layers are required to achieve specified requirements, but this increases process complexity and cost
Solution Approach 1:
The invention changes the chemical composition parameters of the consumable (wire or strip) to include alloying elements at controlled levels. This allows a single cladding pass to achieve the required chemistry by depositing material with the correct composition, eliminating the need for multiple layers with different compositions.
Solution Approach 2:
The base metal surface is prepared in advance by machining or grinding to achieve the desired geometry and surface condition before cladding. This preliminary action ensures that a single cladding pass can deposit the final required thickness and chemistry without needing additional corrective layers.
2Manufacturing precision
If conventional cladding techniques are used, then multiple layers are required to meet chemistry requirements, but this increases deposition time
Solution Approach 1:
The consumable material parameters are optimized to contain the necessary alloying elements (such as nickel, chromium, molybdenum) at appropriate concentrations. This allows a single high-speed pass to deposit cladding with the required weld overlay grade, achieving both precision and high productivity.
Solution Approach 2:
The cladding process operates continuously in a single pass without interruption to deposit the required layer thickness and chemistry. The continuous deposition at optimized speed ensures both high productivity and consistent material properties throughout the cladding layer.
3Manufacturing precision
If alloyed material is deposited to meet chemistry requirements, then dilution with unalloyed base metal occurs, but this makes achieving required chemistry costly or impossible
Solution Approach 1:
The chemical composition parameters of the consumable are specifically designed to compensate for expected dilution with base metal. By adjusting the alloying element content in the wire or strip, the final cladding layer achieves the required chemistry even after dilution occurs during deposition.
Solution Approach 2:
The consumable material has non-uniform composition with concentrated alloying elements positioned to ensure proper distribution in the final cladding layer. This local quality optimization ensures that even with dilution, the required chemistry is achieved in the deposited material.
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 achieves high-speed, single-pass cladding with precise control of chemistry, meeting weld overlay grade requirements, reducing complexity and costs by minimizing the need for multiple consumables and ensuring homogeneity and uniformity in the cladding layer.
Implementation Method 1
cladding the strip electrode onto the surface of the workpiece using electroslag cladding
Implementation Method 2
guiding a metal cored hybrid cladding wire into the weld puddle of the strip electrode for controlling the chemical composition of the cladding
Data Source
AI summary
A hybrid electroslag cladding method includes the steps of: providing a workpiece (6) to be cladded; guiding a strip electrode (4) onto the surface of the workpiece (6); cladding the strip electrode (4) onto the surface of the workpiece (6) using electroslag cladding; guiding a metal cored hybrid electroslag cladding wire (7) into the weld puddle (9) of the strip electrode (4) for controlling the chemical composition of the cladding.