V-Microalloyed Gas Shielded Welding Wire for High Strength and Crack Resistance
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Solution Overview
Problem
High-strength steel welding materials with poor crack resistance and increased production costs due to high carbon equivalents and alloy content, particularly in gas shielded welding processes for applications requiring high tensile strength and toughness.
Innovation Solution
A superhigh strength gas shielded welding wire with a composition of 0.08-0.12% C, 0.65-0.80% Si, 1.80-1.95% Mn, 0<Cu≤0.25%, 0.20-0.40% Cr, 0.2-0.6% Mo, 1.30-1.80% Ni, 0.08-0.20% Ti, 0.01-0.05% V, and controlled impurities, utilizing micro-alloying elements like V and N to enhance toughness and crack resistance while reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high alloy content and high carbon equivalent welding materials are used for steels with strength grade 90 kg and higher, then the tensile strength is improved, but the crack resistance deteriorates and production cost increases
Solution Approach 1:
The patent changes the chemical composition parameters by reducing Ceq to ≤0.60% and adjusting alloy element contents (Ni: 1.00-2.00%, Cr: 0.50-1.50%, Mo: 0.20-0.60%, Ti: 0.05-0.20%, V: 0.03-0.10%) to achieve both high strength (≥880 MPa) and good crack resistance, resolving the contradiction between strength improvement and crack resistance deterioration
Solution Approach 2:
The patent uses composite micro-alloying with multiple elements (Ni, Cr, Mo, Ti, V) working synergistically to achieve high strength and toughness while maintaining low carbon equivalent, thereby improving crack resistance without sacrificing strength
2Strength
If high alloy content and high carbon equivalent welding materials are used for steels with strength grade 90 kg and higher, then the tensile strength is improved, but the production cost increases
Solution Approach 1:
The patent optimizes alloy element parameters to achieve the minimum effective content for high strength (Ni: 1.00-2.00%, Cr: 0.50-1.50%, Mo: 0.20-0.60%, Ti: 0.05-0.20%, V: 0.03-0.10%) while keeping Ceq ≤0.60%, reducing unnecessary alloy additions and lowering production cost
Solution Approach 2:
The patent replaces expensive high-alloy compositions with optimized micro-alloying elements, using smaller amounts of strategic elements (Ti, V) to achieve the same strengthening effect at lower cost
3Strength
If 2 wt. % or more of Ni is added to enable superhigh strength welding material to have good toughness performance, then the low-temperature impact toughness is improved, but the production cost increases significantly
Solution Approach 1:
The patent optimizes the Ni content parameter to a more economical range (1.00-2.00% instead of ≥2.00%) and introduces synergistic alloying elements (Cr, Mo, Ti, V) to achieve the same toughness improvement at lower cost
Solution Approach 2:
The patent creates a composite alloying system where Ni works synergistically with Cr, Mo, Ti, and V to achieve high low-temperature impact toughness without requiring excessive Ni addition, thereby reducing production cost
4Reliability
If micro-alloying elements are used to reduce carbon equivalents of welding materials, then the crack resistance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent sets reasonable parameter ranges for alloy elements (Ni: 1.00-2.00%, Cr: 0.50-1.50%, Mo: 0.20-0.60%, Ti: 0.05-0.20%, V: 0.03-0.10%) that are wide enough to allow manufacturing tolerance but narrow enough to ensure Ceq ≤0.60% and achieve high strength, balancing crack resistance with manufacturing precision requirements
Data Source
AI summary
Provided is a superhigh strength gas shielded welding wire containing V, the mass percentage contents of the chemical elements thereof being: 0.08-0.12% of C, 0.65-0.80% of Si, 1.80-1.95% of Mn, 0<Cu≤0.25%, 0.20-0.40% of Cr, 0.2-0.6% of Mo, 1.30-1.80% of Ni, 0.08-0.20% of Ti, 0.01-0.05% of V, 0.0070-0.0130% of N, and the balance of Fe and other inevitable impurities. Also provided is a method for manufacturing the welding wire. A weld metal obtained after welding with said welding wire has a higher strength and toughness, and also has a good crack resistance, weldability and plasticity.