Investigation and Optimization Of the Parameters Affecting the Strength Of Nd:YAG Pulsed Laser Spot Welding in Steel Sheet Using Design Of Expriment

Subject Areas : Optimization

Abbasali Habibollahi ¹ , Nasrollah Bani mostafa Arab ² , Ali Dehghani ³ , Amir Alinaghizadeh ⁴

1 - Production Supervisor at AKHAVA Co.
2 - Faculty Member-Lecturer at shahid rajaii teacher training university- Mechanical Engineering Department (Manufacturing & Production)
3 - University of Applied Sciences & Technology, Iran Khodro Industrial Center, Tehran, Iran
4 - Faculty Member-Lecturer at Islamic azad university of semnan branch- Mechanical Engineering Department (Manufacturing & Production)

Received: 2015-09-05 Accepted : 2017-05-22 Published : 2017-06-22

Keywords: Optimization, Strength, laser spot welding, Design of Experiments, Response Surface,

Abstract :

Welding plays an important role in manufacturing and it is a reliable and efficient joining process in which the coalescence of metals is achieved by fusion. Nowdays welding is as the main and most common process for joint of metals. Among the welding methods, Laser Beam Welding) has the potential of welding very small and precise components. Localized heating with solidification of the melt, makes the connection between parts. In this thesis, laser spot welding process, which is one of the varieties of LBW process, is studied. In fact the laser spot welding is a simple type of laser welding that is widely used in various industries. The low strength of joints can damage structures. Therefore it is important that the strength of the joint be estimated and optimized. In this research, investigation and optimization of the laser spot welding process using design of experiments and response surface method is considered. Three parameters (peak power, pulse duration and thickness) of the process at three levels were the input factors. Material of sheets that was used in this research is AISI 304 stainless steel. The response or output factor was tensile - shear strength. Minitab16 software was used for design of experiments and analysis of the results. Finally, results showed that increase the peak power until 4250 watt and pulse duration until 3/5 millisecond provide the most tensile - shear strength (2200 Kg), and Square of thickness has the most negative effect on tensile shear strength of the joint.