March 3, 2026Open Access

Assessment of weld quality in blue laser light fiber welding of DP1000 dual-phase steel butt joint

Key Points

Welding joint efficiencies of 86–92% indicate effective weldability for DP1000 steel, supporting high-quality outcomes.
Laser power and welding speed variations yield full penetration within 17.5 to 26.7 J/mm heat inputs, important for energy efficiency.
Hardness testing shows a notable 58–67% increase in Fusion Zone hardness, confirming the process's effectiveness in strengthening joints.
Heat Affected Zone softening presents a key limitation in the use of Blue Laser Light Fiber welding for DP1000 steel.

Abstract

This study evaluates the weldability of 0.8 mm DP1000 steel using Blue Laser Light Fiber (B-LLF) welding. Experiments varying laser power and welding speed achieved full penetration at heat inputs between 17.5 J/mm and 26.7 J/mm. The best samples reached welding joint efficiencies of 86–92% relative to the base material. Hardness testing and Scanning Electron Microscopy confirmed Heat Affected Zone (HAZ) softening, due to tempered martensite, and a 58–67% hardness increase in the Fusion Zone (FZ). The results show that B-LLF welding enables high-quality joints with lower energy consumption than conventional lasers, though HAZ softening remains a key limitation in DP1000 steels.

Assessment of weld quality in blue laser light fiber welding of DP1000 dual-phase steel butt joint

Key Points

Abstract

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