Gas-Shielded Arc Welding Wire Composition for Low-Spatter Coating
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Solution Overview
Problem
Current welding wires for gas-shielded arc welding generate excessive spatter and require a separate slag removal step, leading to coating defects and corrosion issues due to poor electrodeposition coatability.
Innovation Solution
A wire composition with controlled Si and Ti content, along with specific ranges for C, Mn, Cu, Al, P, and S, is used to reduce spatter generation and form a thin, adhesive slag, enabling uniform electrodeposition coating without the need for slag removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welding wire is used, then welding can be performed, but excessive spatter is generated and electrodeposition coatability is poor
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the welding wire. Specifically, it limits C to 0.01-0.10 mass%, Si to 0.05-0.55 mass%, Mn to 1.60-2.40 mass%, and adds Ti at 0.05-0.25 mass%, along with controlling the Ti/Si ratio between 0.1-3.0. These compositional parameter adjustments optimize the welding arc characteristics and slag properties, thereby reducing spatter generation and improving electrodeposition coatability simultaneously.
Solution Approach 2:
The patent employs composite material principles by creating a multi-element alloy composition that combines Fe, C, Si, Mn, Ti, Cu, Al, P, and S in specific proportions. This composite wire material produces a composite slag system during welding that exhibits optimized properties: reduced spatter, controlled viscosity, and improved surface quality that enables uniform electrodeposition coating formation.
2Reliability
If electrodeposition coating is performed after welding, then corrosion protection is improved, but coating film cannot be formed on weld slag resulting in coating defects
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the welding wire composition to produce slag with inherent properties that facilitate subsequent electrodeposition coating. The controlled Ti and Si content, along with the Ti/Si ratio, ensure that the slag forms a smooth, uniform surface during welding that is inherently more receptive to coating adhesion, eliminating the need for additional surface preparation steps.
Solution Approach 2:
The patent changes the chemical parameters of the welding process through precise compositional control. By limiting C to 0.01-0.10 mass% and Si to 0.05-0.55 mass%, and adding Ti at 0.05-0.25 mass%, the resulting slag has modified chemical and physical properties that enable uniform electrodeposition coating, directly addressing the coating formation problem.
3Weight of moving object
If thickness of steel sheet is reduced for weight reduction, then vehicle weight decreases, but corrosion resistance deteriorates
Solution Approach 1:
The patent extracts the corrosion protection function from the steel sheet thickness itself and transfers it to the welding process through optimized wire composition. By using the specific wire composition with controlled C, Si, Mn, Ti, and other elements, the welding process produces high-quality welds with uniform slag that accepts electrodeposition coating effectively, providing corrosion protection independent of base material thickness.
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 results in reduced spatter during welding, excellent electrodeposition coatability, and improved rust prevention, eliminating the need for post-welding slag removal and enhancing the durability of welds.
Implementation Method 1
gas-shielded arc welding
Implementation Method 2
the amount of spatter generated during welding is small
Implementation Method 3
a weld portion having excellent electrodeposition coatability can be obtained
Implementation Method 4
uniformly form a thin slag having high adhesiveness in the weld portion
Implementation Method 5
excellent electrodeposition coatability can be obtained
Data Source
AI summary
A wire for gas-shielded arc welding includes, based on a total mass of the wire C: 0.01 mass % or more and 0.10 mass % or less, Si: 0.05 mass % or more and 0.55 mass % or less, Mn: 1.60 mass % or more and 2.40 mass % or less, Ti: 0.05 mass % or more and 0.25 mass % or less, Cu: 0.30 mass % or less, Al: 0.10 mass % or less, P: 0.025 mass % or less, and S: 0.010 mass % or less with the remainder being Fe and inevitable impurities. In addition, the following relationship is satisfied: 0.1≤[Ti]/[Si]≤3.0, where [Si] is the content of Si (mass %) based on the total mass of the wire and [Ti] is the content of Ti (mass %) based on the total mass of the wire.