Low-Manganese Tubular Welding Wire for Tough Weld Deposits
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Solution Overview
Problem
Existing welding wires with high manganese content can lead to excessive manganese incorporation into weld deposits, affecting weld quality and properties, while low-manganese welding wires often result in reduced tensile strength and toughness.
Innovation Solution
Development of tubular welding wires with less than 0.4% manganese by weight, utilizing a granular core composed of purified titanium dioxide, deoxidizing components like zirconium and aluminum, and alloying components to maintain weld quality and properties, such as tensile strength and toughness, through the use of a metallic sheath with controlled manganese content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high manganese content welding wire is used, then tensile strength is improved, but manganese incorporation into weld deposit increases excessively
Solution Approach 1:
The patent extracts manganese from the welding wire composition by using a metallic sheath with controlled low manganese content (less than 0.4% by weight) and compensating for strength requirements through alternative alloying components and deoxidizing elements in the flux core, thereby reducing manganese incorporation into the weld deposit while maintaining tensile strength
Solution Approach 2:
The patent employs a composite welding wire structure consisting of a metallic sheath containing controlled manganese levels and a flux core with deoxidizing components (zirconium, aluminum) and alloying elements. This composite approach allows the sheath to provide structural strength while the core composition controls the chemical properties of the weld deposit, achieving both tensile strength and low manganese content in the weld
2Quantity of substance
If low manganese content welding wire is used, then manganese incorporation into weld deposit is reduced, but tensile strength and toughness are reduced
Solution Approach 1:
The patent changes the compositional parameters of the welding wire by precisely controlling manganese content in the metallic sheath to less than 0.4% by weight and adjusting the ratios of alternative alloying elements and deoxidizing components in the flux core, thereby achieving low manganese weld deposits while maintaining mechanical properties through optimized parameter combinations
Solution Approach 2:
The patent introduces deoxidizing components (zirconium, aluminum) and alloying components in the flux core as intermediaries that compensate for the reduced manganese content. These intermediaries facilitate the formation of a protective slag layer and contribute to the mechanical properties of the weld deposit through alternative mechanisms, thereby maintaining tensile strength and toughness despite low manganese levels
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 enables the formation of weld deposits with low manganese content while maintaining good mechanical properties, including Charpy V-Notch toughness greater than 65 ft-lbs at -20°F and 45 ft-lbs at -40°F, and reducing fume generation rates.
Implementation Method 1
deoxidizing components like zirconium and aluminum
Implementation Method 2
forming an agglomerate by sintering a mixture comprising pigment-grade titanium dioxide
Implementation Method 3
electrodes for arc welding, such as Gas Metal Arc Welding (GMAW)
Data Source
AI summary
The invention relates generally to welding and, more specifically, to welding wires for arc welding, such as Gas Metal Arc Welding (GMAW) or Flux Core Arc Welding (FCAW). In one embodiment, a tubular welding wire includes a sheath and a core. The tubular welding wire includes less than approximately 0.4% manganese metal or alloy by weight, and the tubular welding wire is configured to form a weld deposit having less than approximately 0.5% manganese by weight.