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Graciadiana. I. Huka
Jurusan Teknik Mesin, Politeknik Negeri Ambon
Industrial & Manufacturing Engineering Mechanical Engineering

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PENGARUH PERLAKUAN ALKALI TERHADAP SIFAT TARIK SERAT EMPULUR SAGU UNTUK APLIKASI PEMBUATAN KOMPOSIT BERBASIS SERAT ALAM Graciadiana. I. Huka; Leslie. S. Loppies
Journal Mechanical Engineering Vol. 1 No. 1 (2023): APRIL 2023
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i1.1621

Abstract

This study aimed to observe the changes in tensile properties of sago pith fiber which has been given the alkali treatment 5% NaOH with the variation of time 0,30,90,120,150,180,210,240 minutes. The object of this study is sago pith fiber. These fibers are cleaned with 100 mm length, the fibers were treated alkali 5% NaOH and tested by using IMADA tensile machine test.The final results this study is shown in relationship between tensile propesties (strength, modulus and strain) versus time of alkali treatment. Based on the test results were obtained the maximum tensile strength of lontar midrib fiber at alkali treatment 240 minutes (4 hours) and maximum modulus of elasticity in the alkali treatment 240 minutes (4 hours). Tensile strength and modulus elastistacity of treated sago pith fiber in comparison with pure sago pith fibers have increased tensile strength and modulus of elasticity is highly significant to 273,15 % dan 122,7%.Keywords : Mechanical Property, sago pith fibers, composite
Pengaruh Variasi Ketinggian Elektrikal Stik Out Pengelasan Gas Metal Arc Welding (GMAW) Terhadap Sifat Mekanis Pada Pipa Seamless Imam A Hanifah; Nevada. J. M. Nanulaitta; Graciadiana. I. Huka
Journal Mechanical Engineering Vol. 1 No. 2 (2023): AGUSTUS
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i2.1990

Abstract

Welding is a process of joining two or more metal materials together through a local melting process. There are many types of welding, one of which is Gas Metal Arc Welding (GMAW). In gas metal arc welding (GMAW), one of the factors that affect the result of welding is the height of the stick out. The purpose of this study was to determine the effect of changing the height of the stick out in the gas metal arc welding (GMAW) welding process on the pipe on the mechanical strength of the pipe. The method used in this study is a quantitative method with data collection techniques through the library, and the main data sources obtained directly from the research process, and related interviews regarding the tools and materials used at the Ambon State Polytechnic Mechanical Engineering Laboratory. The results of the research that the author did show that the greatest Impact Strength with a value of 0.1136 KJ/mm2 is at a height of 7 mm electrical stick out and 0.0960 KJ/mm2 is at a height of 9 mm electrical stick out, this can be seen in the figure 4.1 and 4.2 where the graph will have a decreasing trend with increasing variations in the height of the electrical stick out in GMAW welding, while for the bending test the shorter the electrical stick out will result in increased welding penetration, so that the melting of the weld material in the welding process is getting deeper and the cooling process is getting deeper time results in increased ductility of the seamless pipe, it also depends on the thickness of the material being welded, the gas flow rate and metal transfer in the weld. Keywords : GMAW Welding, Stick Out, Mechanical Properties, Seamless Pipe, Impact Test, Bending Test
PENGARUH VARIASI KETINGGIAN STICK OUT PENGELASAN GMAW DAN VARIASI SUDUT SAMBUNGAN PADA KAMPUH ½ V BAJA KARBON SEDANG TERHADAP SIFAT MEKANIS Julian Salakory; Graciadiana I. Huka; Nevada J. M. Nanulaitta; Annafiyah Annafiyah; Ratna Ayu Pawestri Kusuma Dewi
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2095

Abstract

Abstrak Pengelasan merupakan suatu proses penyambungan antara kedua benda logam dengan cara melelehkan atau meleburkan sebagian dari logam tersebut. Salah satu jenis pengelasan yang ada di Indonesia yaitu pengelasan GMAW (Gas Metal Arc Welding). Untuk penggunaan gas pelindung pengelasan GMAW biasanya menggunakan gas Argon sebagai pelindung yang di aplikasikan pada bahan karbon sedang. Penelitian ini dilakukan dengan tujuan untuk mengetahui variasi ketinggian stick out pengelasan GMAW dan variasi sudut kampuh ½ V baja karbon sedang terhadap sifat mekanis. Metode yang digunakan yaitu metode kuantitatif dengan menggunakan data primer yakni pengambilan data pada Lab dan data sekunder berupa studi literature. Berdasarkan hasil penelitian, pengujian impak berada pada ketinggian stick out 10 mm dimana 60° kampuh ½ V memiliki kekuatan tertinggi dengan nilai 0,0920 KJ/mm2 dan kekuatan impak terendah dengan nilai 0,0383 KJ/mm2 pada 45° kampuh ½ V . Sedangkan untuk kekuatan bending tertinggi berada pada ketinggian stick out 5 mm dengan sudut kampuh ½ V 45° sebesar 608,33 MPa dan kekuatan bending terendah sebesar 475,00 Mpa pada sudut kampuh ½ V 60°. Kata Kunci : Pengelasan GMAW, Kekuatan Impak, Kekuatan Bending
Pengaruh Variasi Arus Pengelasan Gas Metal Arc Welding (GWAM) Terhadap Sifat Mekanis Pada Sifat Seamless Gracia Irene Huka; Leslie. S. Loppies; Josef Matheus; Auliana Diah Wilujeng; Abdul Hamid
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2116

Abstract

GMAW welding is a metal joining process with a melting process with the addition of a coil of wire in the form of electrodes and protective gas. Seamlees pipe, also known as seamless pipe, is an iron pipe without a connection. This study aims to produce data from the results of bending and impact testing on seamlees pipes by varying the welding current with a current of 21.5 volts, 22.5 volts, and 23.5 volts in GMAW welding. After the seamless pipe is welded, impact and bending tests are carried out on the seamlees pipe. From the bending/bending strength test, the highest flexural strength occurred at a current of 21.5 and 22.5 volts, while the lowest flexural strength occurred at a current of 23.5 volts. From the impact test, the highest strength occurred at 21.5 and 22.5 volts and the lowest was at 23.5 volts.  Keywords: Seamlees pipe, GMAW welder, Bending Strength, Impact Strength.  
ANALISA PENGARUH VARIASI KUAT ARUS PENGELASAN FLUX CORED ARC WELDING (FCAW) TERHADAP SIFAT KEKERASAN PADA DAERAH HAZ BAJA KARBON RENDAH Graciadiana. I. Huka; Josef Matheus; Nevada JM. Nanulaitta; Erwin Bravor Pattikayhatu
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i1.2579

Abstract

Welding is a process of joining metals by utilizing electric power as a source of welding heat. Flux-Core Arc Welding (FCAW) is a welding process that uses a heat source from electricity that is converted into a heat source in an electric arc, in this FCAW welding the type of protection used is flux or powder that is in the core of the welding wire (the welding wire is rolled in a roll). This research aims to observe changes in hardness values after welding, both low carbon steel hardness in the HAZ (Heat Affected Zone) area and outside the HAZ (Heat Affected Zone) area. Welding using V-joints with angles of 45° and 60° and varying the voltage strength at 16 volts, 18 volts and 20 volts. Hardness testing using the Rockwell method where the highest hardness value of the HAZ area for 45 is 22.95 HRD at a voltage strength of 20 volts. For V-joints for an angle of 60°, the highest hardness value of the HAZ area is also at a voltage strength of 20 volts with a value of 24.10 HRD. The highest increase in hardness value is at the V-angle 60° joint with a voltage of 20 volts with a hardness value of 21 HRD while the lowest is the V-angle 45° joint with a voltage of 16 volts at 18.67 HRD. Keywords: Hardness Value, HAZ (Heat Affected Zone), FCAW (Flux Cored Arc Welding)
ANALISA VARIASI KAMPUH DAN ARUS LISTRIK LAS PADA MATERIAL BAJA KARBON MENENGAH TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO SAMBUNGAN LAS Lasamahu, Stevanno B D; Huka, Graciadiana I; Nanulaitta, Nevada. JM
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aimed to investigate the effects of weld groove variations and welding current on the tensile strength and microstructure of medium carbon steel joints using FCAW (Flux-Cored Arc Welding). The researcher employed a quantitative approach with an experimental method. The specimens used in this research include FCAW with V-groove and 90 A current, FCAW with V-groove and 70 A current, FCAW with X-groove and 70 A current, FCAW with X-groove and 90 A current, raw material specimens, and microstructure specimens. The data analysis reveals that the highest average tensile stress value among the welded specimens was 463.50 MPa, observed in the FCAW X-groove with 90 A current specimen, while the FCAW V-groove with 70 A current specimen showed the lowest value at 295.1 MPa. Regarding the strain values, the FCAW X-groove with 90 A current specimen had the lowest average strain of 4.15%, whereas the FCAW V-groove with 70 A current specimen had the highest at 5.36%. In terms of microstructure, the FCAW V-groove with 70 A current specimen exhibited martensite, pearlite, and ferrite structures in the weld zone, and ferrite and pearlite structures in the heat-affected zone (HAZ) and base metal. For the FCAW X-groove with 90 A current specimen, pearlite and ferrite structures were found in the weld zone, HAZ, and base metal. Keywords: Carbon Steel, Weld Groove, Welding Current, Tensile Test, Microstructure
ANALISIS PENGARUH VARIASI ARUS PENGELASAN TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO PADA SAMBUNGAN LAS SMAW DAN FCAW DENGAN MATERIAL BAJA KARBON RENDAH Picanussa, Jovancko. S. S.; Nanulaitta, Nevada. JM; Huka, Graciadiana I
Journal Mechanical Engineering Vol. 2 No. 3 (2024): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i3.2889

Abstract

Carbon steel is a type of alloy steel consisting of various elements, especially iron (Fe) and carbon (C). In general, the properties of steel are influenced by the percentage of carbon and the microstructure of the steel which is influenced by the composition of the steel and heat treatment. The welding process can change the structure and composition of the steel. In this study, the welding process used is SMAW and FCAW welding. Then the testing process is carried out, namely tensile testing and microstructure to see the effect of variations in the welding current used. In this study, the author will analyze the effect of variations in welding current on tensile strength or mechanical properties as well as the structure and composition of the specimen to be tested in this case medium carbon steel. The welding methods used are FCAW (Flux Core Arc Welding) and SMAW (Shield Metal Arc Welding). The results of this study, the author found that the welding current has an effect on the tensile strength and microstructure of medium carbon steel. Where for tensile strength, the greater the welding current used, the greater the tensile strength of the specimen where the current range used must be adjusted to the thickness of the workpiece used. In FCAW 90A the value obtained is 438.30 MPa and the strain value is 6.20% and SMAW 90A the value obtained is 438.20 MPa and the strain is 7.20%. Likewise, the Pmax and ΔL values where in SMAW 90 ampere the Pmax value is 43.82 KN and ΔL 3.60mm, FCAW 90 ampere the Pmax value is 43.83 KN and ΔL 3.10mm. With this, the author concludes that with a material thickness of 8mm and a current variation of 70 amperes and 90 amperes, it was found that at a larger welding current of 90 amperes, the tensile strength obtained was greater and for the microstructure, the author found changes in the structure of the welding results in FCAW welding where in the raw material the structure found was ferrite and pearlite while for the FCAW welding results, a beanite structure was found. Keywords: Welding, tensile strength, microstructure.
Co-Authors Annafiyah Annafiyah Auliana Diah Wilujeng Erwin Bravor Pattikayhatu Ida Ayu Putu Sri Widnyani Imam A Hanifah Josef Matheus Julian Salakory Lasamahu, Stevanno B D Leslie S Loppies Nevada M.J. Nanulaitta Picanussa, Jovancko. S. S. Ratna Ayu Pawestri Kusuma Dewi