Analysis of Quasi-Simultaneous Laser Welding in T-Joint Configuration for PMMA-ABS Using Circular Wobble Geometry.

Area of Science:

• Materials Science
• Manufacturing Engineering
• Polymer Processing

Background:

• Laser welding is a key joining technology for polymers.
• Optimizing laser parameters is crucial for weld quality in dissimilar polymer joints.
• Quasi-simultaneous laser welding (QSW) offers potential for high-speed polymer joining.

Purpose of the Study:

• To investigate the quasi-simultaneous laser welding (QSW) of polymethyl methacrylate (PMMA) and acrylonitrile butadiene styrene (ABS) in a T-joint configuration.
• To determine the influence of laser parameters (scanning speed, number of scans, laser power) on weld quality (penetration depth, weld strength).
• To identify optimal welding conditions for mass production compatibility.

Main Methods:

• Utilized a circular wobble laser path for QSW of PMMA and ABS T-joints.
• Varied scanning speeds (1-2 m/s) and scan repetitions (20-70) while maintaining a total welding time around 1 second.
• Analyzed the relationship between linear energy density and penetration depth.
• Assessed weld strength under different laser power settings (above 130 W) and scan repetitions.

Main Results:

• A direct correlation was observed between linear energy density and penetration depth, with higher energy leading to deeper welds.
• Maximum weld strength (1137 N) was achieved with 20 scans and laser power exceeding 130 W.
• An optimal configuration was identified, achieving a weld strength of 1137 N in just 0.8 seconds.

Conclusions:

• QSW is a viable technique for joining PMMA and ABS with high weld strength and speed.
• Laser parameters significantly impact weld quality, with energy density controlling penetration and specific settings optimizing strength.
• The identified optimal QSW parameters demonstrate suitability for industrial mass production applications.