Mohd Afendi Rojan
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Preferred name
Mohd Afendi Rojan
Official Name
Mohd Afendi , Rojan
Alternative Name
Afendi, Mohd
Rojan, M. Afendi
Afendi Rojan, M.
Afendy, M.
Rojan, M. A.
Mohd Afendi, R.
Afendi, M.
Main Affiliation
Scopus Author ID
57188766103
Researcher ID
GQR-0248-2022

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Tensile Properties of Diffusion Bonded Duplex Stainless Steel to Low Carbon Steel

2020-01-01 , Baharudin B.A. , Hussain P. , Mustapha M. , Ayob F. , Ismail A. , Ab Rahman F. , Khalid P.Z.M. , Hamid D.A. , Mohd Afendi Rojan

The diffusion bonding is one of the methods used to join dissimilar metals. Specimens of duplex stainless steel and low carbon steel were joined by diffusion bonding under varied temperature and holding time. The specimens were clamped using jigs and heated in a furnace. Tensile test was performed on the joined samples. The effect of bonding time and holding temperature on tensile strength and quality of the diffusion bonds were observed. Tensile strength of the joints was examined and the highest tensile strength of 116.12 MPa are obtained at temperatures of 900 °C and holding time of 180 min.

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Friction Stir Welding on AA5083 Tee Joint in 1F Position

2020-01-01 , Ismail A. , Awang M. , Zuhir M.S.M. , Rahman F.A. , Baharudin B.A. , Puteri Zarina M.K. , Hamid D.A. , Mohd Afendi Rojan , Dahalan W.M.

Friction stir welding (FSW) is a recent technique that exploits a non-consumable rotating welding tool to generate frictional heat and plastic deformation at the welding location. The principal advantages of FSW, being a solid-state process, are low distortion, absence of melt-related defects and high joint strength, even in those alloys that are considered non-weldable by conventional techniques. Hard materials such as steel and other important engineering alloys can now be welded efficiently using this process. The understanding has been useful in reducing defects and improving uniformity of weld properties and expanding the applicability of FSW to new engineering alloys. This project focuses mainly on the experimental study of FSW on AA5083 T-joint in 1F position. This study investigates the jig fixture and tool pin design with effects of pin rotation speed on the macrostructure of the joint. The present work deals with an experimental campaign aiming on FSW on aluminium alloy 5083 T-joint. Tool pins are fabricated using material high tensile steel H13 with angle shoulder with heat treatment process for surface-hardened tools.

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Microwave welding of thermoplastic using silicon carbide nanowhiskers as susceptor effect of heating duration

2024-06 , Phey Yee Foong , Voon Chun Hong , Lim Bee Ying , Teh Pei Leng , Yeoh Cheow Keat , Mohd Afendi Rojan , Nor Azizah Parmin , Subash Chandra Bose Gopinath , Foo Wah Low , Muhammad Kashif , Nor Azura Abdul Rahman , Sam Sung Ting , Veeradasan Perumal

Microwave welding is becoming more popular than conventional joining methods due to its advantages such as rapid and localised heating as well as applicable to components with complicated geometry. Previously reported susceptor, such as carbonaceous materials and conductive polymers, are toxic and the welding process involving these susceptors is time-consuming. Because of its exceptional microwave absorption and biocompatibility, silicon carbide nanowhiskers (SiCNWs) was employed as the microwave susceptor for microwave welding. Microwave welding in this study comprises of only three simple steps: SiCNWs suspension preparation, SiCNWs application and microwave heating. The weld strength of welded joint was then characterised using tensile test and energy dispersive x-ray spectroscopy equipped scanning electron microscopy (EDS-SEM) to study its mechanical properties and cross-section microstructure. The influence of microwave irradiation time was studied in this study, and it is found that the weld strength rose with the extension of microwave irradiation time, until a maximum weld strength of 1.61 MPa was achieved by 17 s welded joint. The development of SiCNWs reinforced PP nanocomposite welded joint layer is responsible for the enhanced weld strength. Prolonged heating duration may also result in flaws such as void formation at the welded joint, which subsequently lowered the weld strength to 0.60 MPa when the heating duration was extended to 20 s. In sum, a strengthen welded joint can be formed with rapid microwave heating under the proper control of heating duration.

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A comparative study of microwave welding using multiwalled carbon nanotubes and silicon carbide nanowhiskers as microwave susceptors

2024-10 , Phey Yee Foong , Voon Chun Hong , Lim Bee Ying , Teh Pei Leng , Yeoh Cheow Keat , Mohd Afendi Rojan , Nor Azizah Parmin , Subash Chandra Bose Gopinath , Foo Wah Low , Muhammad Kashif , Nor Azura Abdul Rahman , Sam Sung Ting , Veeradasan Perumal

Recently, microwave welding has arisen as an advanced joining method due to its versatility and rapid heating capabilities. Among others, microwave susceptors play a crucial role in microwave welding, as different classes of microwave susceptors have distinct microwave heating mechanisms. In this work, polypropylene (PP) was utilized as a thermoplastic substrate and two types of microwaves susceptors, namely multiwalled carbon nanotubes (MWCNTs) and silicon carbide nanowhiskers (SiC NWs), were studied for microwave welding. The susceptor was first dispersed in acetone to form susceptor suspension. Next, the susceptor suspension was deposited onto the targeted area on substrate and paired with another bare PP substrate. The paired sample was then exposed to 800 W microwave radiation in a microwave oven. Afterward, the welded joint was evaluated using a tensile test and scanning electron microscopy to determine its joint strength and cross-section microstructure. The results showed that the joint strength increased as the heating duration increased. The welded joint formed using MWCNTs achieved a maximum strength of 2.26 MPa when 10 s was used, while the SiC NWs-formed welded joint achieved a maximum strength of 2.25 MPa at 15 s. This difference in duration in forming a complete welded joint can be attributed to the higher microwave heating rates and thermal conductivity of MWCNTs. However, increasing the heating duration to 20 s caused severe deformation at the welded joint and resulted in low joint strength. Overall, this study highlights the significance of understanding the microwave heating mechanism of different susceptors and provides essential insight into the selection of a microwave susceptor for microwave welding.

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