Modeling and Optimization of Laser Direct Joining Process Parameters of Titanium Alloy and Carbon Fiber Reinforced Nylon Based on Response Surface Methodology

Abstract

A laser direct joining (LDJ) experiment of titanium alloy (Ti-6Al-4V) and carbon fiber reinforced nylon (PA66CF20) is presented here using diode laser equipment. Experimental design and experiment of LDJ are carried out according to a single process parameters range obtained from the previous experiment. Response surface methodology (RSM) in Design-Expert v7 software is adopted to establish the mathematical model between LDJ process parameters and joint quality. Then the interaction effects of joining process parameters (laser power, scan speed and stand-off distance) on joint quality are investigated using analysis-of-variance (ANOVA), and the result shows that the interaction effect of laser power and scan speed on joint quality is the greatest. Finally, the predicted values from the mathematical model established by RSM are compared with the experimental values, and the process parameters are optimized to obtain the strongest joint strength. The result suggests that the predicted values are in good agreement with the experimental ones. The purpose of predicting and optimizing joint quality based on reasonable process parameters is achieved.

Laser Ablation of Titanium Alloy (Ti64): Effects of Process Parameters on Performance of Laser Welded Ti64 – Polyamide 6.6 Joints.

“…This precise control over the heat input provides the opportunity to thoroughly melt the polymer at the interface of the joint while, at the same time, avoiding its degradation [9,10]. To model the effects of laser welding parameters and optimize the joining process, previous work demonstrated the successful use of DoE techniques for laser joining of Ti64 to PA6.6 [11] and carbon fiber reinforced PA6.6 [12]. Surface pretreatment of metals, prior to thermal joining with polymers, has shown significant impact on improving performance of assemblies.…”

“…First, it is complementary to article [11] by utilizing laser ablation in order to further increase the joint resistance of Ti64-PA66 assemblies. Even with their high industrial relevance, such assemblies obtained by laser welding are seldom reported in literature [12], and the aim of the authors is to show the performance of an all-laser process -Ti64 laser ablation pretreatment and laser welding with PA66 -to obtain high level of mechanical resistance for Ti64-PA66 assemblies.…”