High-Mn GMAW Solid Wire Composition for Low-Fume Cryogenic Welds
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Solution Overview
Problem
Existing welding techniques for high Mn steel materials in cryogenic environments generate a large amount of fume, posing health risks to welders and compromising the quality of weld joints.
Innovation Solution
A solid wire for gas metal arc welding with a specific chemical composition (C: 0.2% to 0.8%, Si: 0.15% to 0.9%, Mn: 17.0% to 28.0%, Ni: 0.01% to 10.0%, Cr: 0.4% to 4.0%, Mo: 0.01% to 3.5%, B: less than 0.0010%, and N: 0.003% to 0.12%) that reduces fume generation and enhances weld joint strength and toughness at cryogenic temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flux cored wire is used for welding high Mn steel, then weld joint strength and cryogenic toughness can be achieved, but a large amount of fume is generated during welding
Solution Approach 1:
The invention changes the chemical composition parameters of the welding wire by strictly limiting boron content to 0.0010% or less and controlling carbide-forming elements (Ti, Nb, V) to 0.04% or less, while maintaining high Mn content (17.0-28.0%). This parameter optimization prevents excessive carbide formation that would otherwise increase fume generation, while still achieving weld joint strength of 400 MPa or more and excellent cryogenic toughness with absorbed energy of 28 J or more at -196°C
Solution Approach 2:
The invention applies local quality control by specifically targeting the suppression of boron nitride and carbide formation through localized chemical composition control. By reducing boron to trace levels and limiting carbide-forming elements only in the welding wire composition, the invention locally addresses the fume generation problem at the source without compromising the overall weld joint performance or requiring changes to the base metal
2Ease of manufacture
If boron and carbide-forming elements are reduced in the wire composition, then wire drawing manufacturability improves, but weld joint strength may be compromised
Solution Approach 1:
The invention optimizes the chemical composition parameters by setting boron to 0.0010% or less and carbide-forming elements to 0.04% or less, which improves wire drawing manufacturability by preventing excessive carbide formation. Simultaneously, the invention compensates for potential strength loss by maintaining high Mn content (17.0-28.0%) and optimizing C (0.2-0.8%), Si (0.15-0.9%), and Mo (0.01-3.5%) content to achieve weld joint strength of 400 MPa or more through alternative strengthening mechanisms
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 solid wire achieves excellent manufacturability, significantly reduces fume generation during welding, and produces weld joints with high strength (yield strength ≥ 400 MPa) and excellent impact toughness at cryogenic temperatures (absorbed energy ≥ 28 J in Charpy impact tests).
Implementation Method 1
gas metal arc welding
Data Source
AI summary
Provided is a solid wire for gas metal arc welding, which has a small amount of fume during welding and is suitable as a welding material for high Mn steel materials. The wire has a chemical composition containing, in mass%, C: 0.2% to 0.8%, Si: 0.15% to 0.90%, Mn: 17.0% to 28.0%, P: 0.03% or less, S: 0.03% or less, Ni: 0.01% to 10.00%, Cr: 0.4% to 4.0%, Mo: 0.01% to 3.50%, B: less than 0.0010%, and N: 0.12% or less, with the balance consisting of Fe and inevitable impurities. It may contain at least one selected from V, Ti, Nb, Cu, Al, Ca and REM, if necessary. The wire has excellent manufacturability, can significantly suppress the amount of fume generated during gas metal arc welding, and can easily manufacture a weld joint having high strength and excellent impact toughness at cryogenic tem peratures.