Gas-Shielded Arc Welding Wire Composition for Low-Ni Giga Steel
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Solution Overview
Problem
The development of ultra-high strength automobile lightweight chassis parts using Giga Steel faces challenges in achieving economic feasibility and optimizing microstructure and mechanical properties during welding, particularly for thin steel sheets, due to the high cost of Ni-containing materials and lack of understanding of phase transformation mechanisms.
Innovation Solution
A welding member and wire for gas shielded arc welding are formulated with specific alloy compositions and relational expressions to ensure excellent strength and toughness, including elements like C, Si, Mn, Cr, Mo, P, S, Al, Ni, Ti, Nb, and Fe, with controlled ratios to optimize the weld zone microstructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing ultra-high strength welding materials containing a large amount of Ni are used, then the strength and toughness of the weld zone are improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the welding material by strictly controlling the Ni content to 0.40% or less (down from traditional high Ni contents), while simultaneously optimizing other alloying elements (C: 0.05-0.16%, Si: 0.001-1.0%, Mn: 1.0-2.5%, Cr: 0.1-5.0%, Mo: 0.1-1.5%) to achieve the required strength and toughness at lower cost
Solution Approach 2:
The patent creates a composite alloy system that combines multiple elements (C, Si, Mn, Cr, Mo, Ni, Ti, Nb) in specific proportions to replace the reliance on high Ni content, forming a new composite material composition that achieves ultra-high strength properties through synergistic effects of multiple alloying elements rather than depending on a single expensive element
2Ease of manufacture
If the Ni content is reduced to improve economic feasibility, then the manufacturing cost decreases, but the microstructure and mechanical properties of the weld zone may not be optimized
Solution Approach 1:
The patent systematically adjusts multiple composition parameters simultaneously: reduces Ni to ≤0.40%, controls C at 0.05-0.16%, Si at 0.001-1.0%, Mn at 1.0-2.5%, Cr at 0.1-5.0%, Mo at 0.1-1.5%, and applies relational expressions (Expression 1: 15≤[Cr]+20×[Mo]+35×[Ni]+50×([Ti]/[Nb])×t/([Si]/[Mn])≤45; Expression 2: 400≤732−202×[C]+216×[Si]−85×[Mn]−37×[Ni]−47×[Cr]−39×[Mo]≤515) to optimize the microstructure and mechanical properties despite low Ni content
Solution Approach 2:
The patent replaces expensive Ni (a costly alloying element) with more economical alloying strategies using cheaper elements like Mn, Cr, and Mo in optimized combinations, achieving similar or better performance at lower material cost
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 solution effectively secures economic feasibility while ensuring excellent strength and toughness of welding metals for Giga Steel, improving the weld zone's microstructure and mechanical properties.
Implementation Method 1
wire for gas shielded arc welding
Data Source
AI summary
The present disclosure relates to a welding member and a wire for gas shielded arc welding.