scholarly journals Interface Formation and Bonding Mechanisms of Laser Welding of PMMA Plastic and 304 Austenitic Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1495
Author(s):  
Yijie Huang ◽  
Xiangdong Gao ◽  
Bo Ma ◽  
Yanxi Zhang
Keyword(s):  
Stainless Steel ◽  
Shear Stress ◽  
Austenitic Stainless Steel ◽  
Laser Welding ◽  
Process Parameters ◽  
Plastic Metal ◽  
Hybrid Joints ◽  
304 Austenitic Stainless Steel ◽  
Bonding Mechanisms ◽  
The Impact

Laser welding experiments involving amorphous thermoplastic polymer (PMMA) and 304 austenitic stainless steel plates were conducted to explore the influence of laser welding process parameters on plastic–metal joints. A high-speed camera was applied to record the dynamics of the molten pool and the formation of bubbles to reveal the bonding mechanisms of the hybrid joints. The influence of process parameters on the joints was analyzed using temperature measurements performed with thermocouples. The microstructure morphology of joints was observed using SEM. The mechanical characterization of the hybrid joints was carried out to understand the effect of the welding conditions on the weld morphology, flaws and shear stress. Different interface temperatures resulted in two types of bubbles and led to different weld morphology characteristics. A stable hybrid joint with the best shear stress was produced with a laser line energy of 20.16 J/mm2, a temperature of 305 °C and small bubbles. The shear stress of the effective joint under the maximum mechanical resistance was 4.17 MPa. The chemical bonds (M-O, M-C) and mechanical anchoring that formed on the steel’s surface contributed to the joint bonding. Range analysis provided guidance for identifying the impact of individual factors in the shear stress for the laser welding of plastic–metal.

scholarly journals Experimental study on chip shape in ultrasonic vibration–assisted turning of 304 austenitic stainless steel

2019 ◽  
Vol 11 (8) ◽  
pp. 168781401987089 ◽  
Author(s):  
Yingshuai Xu ◽  
Zhihui Wan ◽  
Ping Zou ◽  
Qinjian Zhang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultrasonic Vibration ◽  
Process Parameters ◽  
Chip Morphology ◽  
Cutting Parameters ◽  
Chip Shape ◽  
304 Austenitic Stainless Steel ◽  
On Chip ◽  
The Impact

There are many problems and physical phenomena in turning process, like machined surface quality, cutting force, tool wear, and so on. These factors and the chip shape of workpiece materials, which is an important aspect to study the mechanism of ultrasonic vibration–assisted turning, go hand in hand. This article first introduces the types and changes of chip, meanwhile the chip formation mechanism of ultrasonic vibration–assisted turning is studied and analyzed, and the turning experiments of 304 austenitic stainless steel with and without ultrasonic vibration are carried out. The difference of chip morphology between ultrasonic vibration–assisted turning and conventional turning is contrasted and analyzed from the macroscopic and microscopic point of view. The influence of process parameters on chip shape and the impact of chip shape on machining effect are also analyzed. Results indicate that when process parameters (vibration frequency, ultrasonic amplitude, and cutting parameters) are suitably selected, ultrasonic vibration–assisted turning can gain access to better chip shape and chip breaking effect than conventional turning. By contrast with conventional turning, phenomenon of serrated burr on the chip edge and the surface defects of chip in ultrasonic vibration–assisted turning have improved significantly. Moreover, it is found that superior chip morphology in ultrasonic vibration–assisted turning can be acquired under the circumstance of comparatively small cutting parameters (cutting speed, depth of cut, and feed rate); at the same time, preferable chips can also obtain ranking machining effect.

Investigation of Durability T = f (vc) in Turning of the AISI 304 Austenitic Stainless Steel Using the CNMG 120408 Coated Carbide Insert

2014 ◽  
Vol 941-944 ◽  
pp. 1633-1643 ◽  
Author(s):  
Rozmarína Dubovská ◽  
Jozef Majerik ◽  
Henrieta Chochlikova
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Experimental Tests ◽  
Cnc Machine ◽  
Aisi 304 ◽  
304 Austenitic Stainless Steel ◽  
Technological Heredity ◽  
Cutting Insert ◽  
The Impact ◽  
Coated Carbide

The main aim of the authors research is to assess the investigation of durability T = f (vc) in turning of the AISI 304 austenitic stainless steel with the CNMG 120408 coated carbide cutting insert. Experimental tests of selected material were realized in the CNC machine tool Doosan Puma 240 with Fanuc 21i TB control system. This experimental study is a continuation of the solutions of grant VEGA no. 1/9428/02 titled “The technological heredity of the machined surfaces - surface integrity”. The aim of the present paper is to focus scientific research on the impact of the various applied values of cutting speeds in the outer longitudinal turning. This paper, together with the achieved results is a basis that will optimize the performance of turning process of the austenitic stainless steel AISI 304 used for special applications with their dominant functional areas.

scholarly journals Experimental Investigation of Ultrasonic Vibration Assisted Turning of 304 Austenitic Stainless Steel

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Ping Zou ◽  
Yingshuai Xu ◽  
Yu He ◽  
Mingfang Chen ◽  
Hao Wu
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Process Parameters ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
304 Austenitic Stainless Steel ◽  
3D Surface Topography

This research study focuses on the experimental analysis of the three-dimensional (3D) surface topography and surface roughness of the workpiece machined with ultrasonic vibration assisted turning (UAT) in comparison to conventional turning (CT). For the challenge that machining difficulties of 304 austenitic stainless steel (ASS 304) and high demands for the machined surface quality and machining precision represent, starting with cutting principle and processing technology, the ultrasonic vibration method is employed to scheme out a machining system of ultrasonic vibration assisted turning (MS-UAT). The experiments for turning the workpiece of ASS 304 are conducted with and without ultrasonic vibration using the designed MS-UAT, and then the 3D morphology evaluation parametersSaandSqare applied to characterize and analyse the machined surface. The experimental results obtained demonstrate that the process parameters in UAT of ASS 304 have obvious effect on the 3D surface topography and surface roughness of machined workpiece, and the appropriate choice of various process parameters, including ultrasonic amplitude, feed rate, depth of cut, and cutting speed, can enhance the machined surface quality efficiently to make the machining effect of UAT much better than that of CT.

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