Austenitic Stainless Steel Welding Flux Composition
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Solution Overview
Problem
Conventional welding fluxes used for austenitic stainless steel have limitations in achieving a high depth-to-width (D/W) ratio and surface hardness, particularly when welding thick section workpieces, resulting in inadequate joint penetration and insufficient abrasion resistance.
Innovation Solution
A welding flux composition of 20-40 wt.% silicon carbide (SiC), 20-30 wt.% silicon dioxide (SiO2), 15-25 wt.% molybdenum trioxide (MoO3), 2-10 wt.% titanium dioxide (TiO2), and 1-5 wt.% nickel oxide (NiO) with SiC particles of 20-40 nm, which enhances surface hardness and D/W ratio while maintaining joint penetration and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional welding flux is applied to achieve deep joint penetration, then joint penetration is improved, but surface hardness becomes insufficient
Solution Approach 1:
The welding flux uses a composite formulation combining TiO2 (30-50 wt%), SiO2 (20-40 wt%), Cr2O3 (10-30 wt%), NiO (5-20 wt%), and CuO (5-20 wt%). This composite composition creates a synergistic effect where TiO2 and SiO2 form a deep, narrow weld pool for adequate penetration, while Cr2O3, NiO, and CuO contribute to forming a hard, abrasion-resistant surface layer with improved surface hardness
Solution Approach 2:
The invention optimizes the chemical composition parameters of the welding flux by specifying precise weight percentage ranges for each oxide component. By controlling the ratios of these oxides, the flux achieves the dual objective of deep joint penetration and high surface hardness, resolving the contradiction between penetration depth and surface hardness
2Manufacturing precision
If TIG welding is used to maintain high welding quality, then weld quality is improved, but productivity decreases for thick section workpieces
Solution Approach 1:
The welding flux acts as an intermediary substance applied to the joint of thick section workpieces. It enables single-pass welding of thick sections (exceeding 3mm) by facilitating deep penetration and forming a protective slag layer, thereby achieving both high weld quality and improved productivity compared to conventional TIG welding which requires multiple passes
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 proposed flux composition significantly improves the surface hardness and D/W ratio of welds, reducing angular deformation and enhancing abrasion resistance without compromising joint penetration or corrosion resistance, thus improving welding quality.
Implementation Method 1
the conventional welding flux will be melted to form a molten pool at the joint of the two workpieces. The molten pool is then cooled down to room temperature, resulting in a weld which tightly joins two workpieces
Implementation Method 2
The molten pool is then cooled down to room temperature, resulting in a weld which tightly joins two workpieces
Implementation Method 3
The molten pool is then cooled down to room temperature, resulting in a weld which tightly joins two workpieces
Implementation Method 4
with an electric arc generated by a tungsten electrode as a welding heat source for melting the joint of two workpieces
Implementation Method 5
with an electric arc generated by a tungsten electrode as a welding heat source for melting the joint of two workpieces
Data Source
AI summary
The present disclosure provides a welding flux used for austenitic stainless steel, which includes 20-40 wt. % SiC, 20-30 wt. % SiO2, 15-25 wt. % MoO3, 2-15 wt. % TiO2, 2-10 wt. % NiO, and 1-5 wt. % MgO. As such, the welding flux forms a soundness weld with high D/W ratio and surface hardness.