Titanium-Steel Composite Plate Welding With a Copper Interlayer
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Solution Overview
Problem
Traditional welding methods for titanium-steel composite plates result in brittle phases, cracks, and contamination, leading to poor mechanical and corrosion resistance, limiting their application in critical structures.
Innovation Solution
A fusion welding process involving an intermediate copper layer, specific groove configurations, and controlled welding parameters to form a crack-free joint, ensuring integrity and enhanced corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional welding methods are used to join titanium and steel directly, then welding connection is achieved, but brittle phases form and cracks occur reducing joint reliability
Solution Approach 1:
A pure copper intermediate layer is introduced between the titanium cladding layer and steel base layer. The copper layer acts as a buffer that prevents direct contact and reaction between titanium and steel, eliminating brittle intermetallic compounds while maintaining welding connection. The copper layer is deposited on the steel surface before welding, creating a three-layer structure that resolves the contradiction between achieving weld connection and preventing brittle phase formation.
2Reliability
If titanium and steel are welded separately using indirect patching methods, then crack formation is reduced, but the process becomes cumbersome and welding reliability remains low
Solution Approach 1:
The pure copper intermediate layer is deposited on the steel surface before the welding process begins. This preliminary action prepares the interface in advance, preventing direct titanium-steel contact during welding. By pre-establishing the copper barrier layer, the complex indirect patching process is simplified into a single integrated welding operation that achieves both crack prevention and process simplification.
3Productivity
If direct welding of titanium and steel is performed, then welding efficiency is improved, but contamination by oxygen, hydrogen, and carbon occurs reducing plasticity and toughness
Solution Approach 1:
The pure copper intermediate layer serves as a protective barrier that prevents oxygen, hydrogen, and carbon from the steel side from contaminating the titanium cladding layer during direct welding. The copper layer allows efficient heat transfer and welding operation while blocking harmful element diffusion, thus maintaining both welding efficiency and joint plasticity/toughness.
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 process achieves a crack-free welded joint with superior dynamic load-bearing capacity and corrosion resistance, significantly extending the service life and reliability of titanium-steel composite plates.
Implementation Method 1
Perform welding of titanium layer, pure copper intermediate layer, and steel base layer
Implementation Method 2
using CMT (Cold Metal Transfer) welding to perform copper cladding treatment on the titanium/steel interface
Data Source
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AI summary
The present invention relates to a fusion welding process for a titanium steel composite plate. The process comprises: welding groove processing: matching different groove processing forms according to different uses of titanium steel composite plates; welding groove deep processing: using a CMT welding method to perform copper cladding treatment on groove interfaces of titanium steel composite plates to be welded; performing spot fixation welding on two composite plates after the cladding treatment; welding a titanium cladding layer, a pure copper intermediate layer and a steel base layer. The present invention forms crack-free welded joints by means of designing an intermediate welding material, specific groove types, groove deep processing and matching welding, solving the technical problem of titanium steel not being able to be welded, and ensuring the integrity of the welded joints, making the invention applicable to complex structures, and making large-scale application of titanium steel composite plates possible.