Beveled Edge Pre-Coating for Stable Laser Arc Hybrid Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laser arc hybrid welding of steel substrates faces challenges in reducing crack occurrence, improving process stability, and increasing weld penetration and deposition rate, while maintaining mechanical properties.
Innovation Solution
A method involving a pre-coating with a titanate and nanoparticulate oxide on the beveled edge of steel substrates, which modifies melt pool physics, enhances arc constriction, and improves weld penetration by incorporating the pre-coating into the molten metal, reducing gas entrapment and heat-affected zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser arc hybrid welding is used to increase weld penetration depth and welding speed, then productivity is improved, but crack occurrence increases and process stability deteriorates
Solution Approach 1:
The patent applies a pre-coating containing flux and nanoparticulate oxide to the beveled edge before welding. This preliminary action modifies the welding process by controlling arc constriction, stabilizing melt pool fluid flow, and preventing gas entrapment, thereby maintaining process stability while achieving high welding speeds and penetration depths
2Productivity
If laser arc hybrid welding is used to increase weld penetration depth, then manufacturing efficiency is improved, but crack occurrence in welds increases
Solution Approach 1:
The patent converts the potentially harmful rapid cooling that causes cracking into a beneficial process by using the pre-coating to control arc constriction and melt pool dynamics. The nanoparticulate oxide in the pre-coating stabilizes the fluid flow, preventing gas entrapment and crack formation while maintaining deep penetration
3Productivity
If conventional laser arc hybrid welding is used to improve welding speed, then deposition rate increases, but process stability deteriorates
Solution Approach 1:
The patent changes the chemical and physical parameters of the welding interface by introducing a pre-coating with specific flux composition and nanoparticulate oxide. This modifies arc constriction characteristics and melt pool fluid flow, enabling stable operation at high deposition rates that would otherwise cause process instability
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 pre-coating increases weld penetration depth, reduces defects, and enhances the mechanical properties of the welded joint, improving productivity and stability of the welding process.
Implementation Method 1
enhances arc constriction
Implementation Method 2
modifies melt pool physics, enhances arc constriction, and improves weld penetration by incorporating the pre-coating into the molten metal
Implementation Method 3
reducing gas entrapment and heat-affected zones
Implementation Method 4
reducing gas entrapment and heat-affected zones
Data Source
AI summary
A method for the manufacture of a welded joint having the following successive steps: I. the provision of at least two metallic substrates wherein at least one metallic substrate is a steel substrate having a thickness of at least 8 mm and being delimited by at least one beveled edge, wherein said beveled edge is at least partially coated with a pre-coating having a titanate and a nanoparticulate oxide selected from the group consisting of TiO2, SiO2, ZrO2, Y2O3, Al2O3, MoO3, CrO3, CeO2, La2O3 and mixtures thereof, and II. the welding of the at least two metallic substrates along the at least partially coated beveled edge by laser arc hybrid welding in leading arc configuration.