scholarly journals Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 797 ◽  
Author(s):  
Fatih Dokme ◽  
Mustafa Kulekci ◽  
Ugur Esme

This study investigated the microstructure of the dissimilar metal welding of Inconel 625 and AISI 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) processes with ERNiCr-3, TIG 316L and twisted (ERNiCr-3 and TIG 316L) fillers. Microstructure examinations were carried out using an optical microscope and Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray (EDAX). The results of the study showed the existence of a partially melted zone (PMZ) on the AISI 316L side. Weld zone (WZ) analysis showed the existence of a multi-directional grain growth on the 316L side in all specimens, although less growth was found on the Inconel 625 side. Grain growth almost disappeared using PCGTAW with twisted fillers. SEM/EDAX investigations indicated that secondary deleterious secondary phases were tiny and white in five experiments. However, a meager amount of precipitates occurred in PCGTA welding with twisted fillers. Moreover, these were particularly innocent precipitates, represented by black dots in images, whereas other tiny white secondary phases are known to be brittle. As a result, PCGTA welding with twisted fillers exhibited the best metallurgical properties.

2010 ◽  
Vol 15 (2) ◽  
pp. 112-120 ◽  
Author(s):  
Luciana Iglésias Lourenço Lima ◽  
Guilherme Marconi Silva ◽  
Angel Raphael Arce Chilque ◽  
Mônica Maria de Abreu Mendonça Schvartzman ◽  
Alexandre Queiroz Bracarense ◽  
...  

As soldas dissimilares (dissimilar metal welds - DMWs) são utilizadas em diversos segmentos da indústria. No caso específico de usinas nucleares, tais soldas são necessárias para conectar tubulações de aço inoxidável com componentes fabricados em aços baixa liga. Os materiais de adição mais utilizados neste tipo de solda são as ligas de níquel 82 e 182. Este trabalho consistiu na soldagem de uma junta dissimilar de aço baixa liga ASTM A-508 G3 e aço inoxidável austenítico AISI 316L utilizando as ligas de níquel 82 e 182 como metais de adição. A soldagem foi realizada manualmente empregando os processos de soldagem ao arco SMAW (Shielded Metal Arc Welding) e GTAW (Gas Tungsten Arc Welding). Os corpos de prova foram caracterizados microestruturalmente utilizando-se microscópio óptico e microscópio eletrônico de varredura com microanálise por dispersão de energia de raios X (EDS) e ensaios de microdureza Vickers. Observou-se uma microestrutura constituída de dendritas de austenita com a presença de precipitados com formas e dimensões definidas pelo aporte térmico e pela direção de soldagem. Não houve variação significativa da dureza ao longo da junta soldada, demonstrando a adequação dos parâmetros de soldagem utilizados.


2009 ◽  
Vol 410-411 ◽  
pp. 533-541 ◽  
Author(s):  
W. Chuaiphan ◽  
Somrerk Chandra-ambhorn ◽  
B. Sornil ◽  
Wolfgang Bleck

Gas tungsten arc welding was applied to join AISI 304 stainless steel and AISI 1020 carbon steel sheets with three types of consumables – AISI 308L, AISI 309L and AISI 316L stainless steel wires. Weld metals produced by all consumables exhibited the identical hardness of ca. 350 HV. This value was higher than those of stainless steel and carbon steel base metals, indicating the relatively high strength of weld metals. The corrosive behaviour of weld metals was investigated by a potentiodynamic method. Specimens were tested in 3.5 wt% NaCl solution saturated by laboratory air at 27°C. A pitting potential of weld metal produced by the AISI 309L consumable was higher than those of weld metals produced by the AISI 308L and AISI 316L consumables respectively. The chemical compositions and microstructure of weld metals were also investigated. The pitting corrosion resistance of weld metals produced by different consumables is discussed in the paper in terms of the pitting resistance equivalent number (PREN) calculated from the chemical compositions and the content of delta ferrite in the austenite matrix of the weld metals.


Author(s):  
M Sathishkumar ◽  
M Manikandan

Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.


2020 ◽  
Vol 8 (2) ◽  
pp. 86
Author(s):  
Yoyok Winardi ◽  
Fadelan Fadelan ◽  
Munaji Munaji ◽  
Wisnu Nurandika Krisdiantoro

Pengelasan logam adalah suatu proses pengelasan yang dilakukan pada dua jenis atau paduan logam yang berbeda. Pengelasan logam beda jenis banyak dipakai di berbagai industri, misalnya pembangkit listrik, industri transportasi, kontruksi sipil, dan lain-lain. Baja merupakan material yang banyak digunakan untuk kontruksi. Aplikasinya banyak disambung dengan logam lain. Penyambungannya dilakukan dengan pengelasan. Dalam penggabungan dua logam yang berbeda permasalahan yang sering timbul dalam pengelasan antara lain perbedaan titik lebur, koefisien muai, sifat fisis dan mekanis. Oleh karena itu dengan pemilihan elektroda pengelasan yang tepat akan menghasilkan sambungan yang baik. Penelitian ini bertujuan untuk mengetahui pengaruh jenis elektroda pada baja AISI 1045 dan SS202 terhadap struktur mikro dan kekuatan tarik. Elektroda yang digunakan pada penelitian ini adalah jenis E 6013 dan E 7018. Metode pengelasan menggunakan las SMAW. Struktur mikro dikarakterisasi menggunakan mikroskop optik. Kekuatan mekanik diuji menggunakan mesin uji tarik. Hasil pengamatan struktur mikro pada masing-masing spesimen menunjukkan adanya perbedaan susunan. Struktur mikro didominasi oleh ferit dan perlit. Dengan menggunakan elektroda E7018, menghasilkan perlit yang lebih halus. Berdasarkan uji tarik, terdapat perbedaaan yang signifikan. Pada spesimen E 6013 memiliki kekuatan tarik rata-rata sebesar 275,7 kN/mm2, sedangan E 7018 memiliki kekuatan rata-rata sebesar 419,5 kN/mm2. Sehingga bisa disimpulkan, jenis elektroda mempengaruhi kekuatan tarik pengelasan baja AISI 1045 dan SS202Kata Kunci: AISI 1045; elektroda; kekuatan tarik; SS202; struktur mikro Daftar RujukanArifin J, Purwanto H, Syafa’at I. (2017). Pengaruh jenis elektroda terhadap sifat mekanik hasil pengelasan smaw baja ASTM A36. Momentum, 13(1), 27–31.Budiarsa, I. N. (2008). Pengaruh besar arus pengelasan dan kecepatan volume alir gas pada proses las GMAW terhadap ketangguhan aluminium 5083. CAKRAM, 2(2), 112–116.Gutama H.K, Wulandari D. (2000). Pengaruh Arus Pengelasan Dan Jenis Elektroda Terhadap Kekuatan Tarik Pada Steel 42. Jurnal Teknik Mesin Fakultas Teknik Unesa, (1), 1–5.Huda M, Respati B.S.M, Purwanto H. (2018). Pengelasan plat kapal dengan variasi jenis elektroda dan media pendingin. Momentum, (14), 50–56.Kurniawan. Dwi. (2019). Analisa pengaruh variasi elekroda pengelasan smaw sambungan logam baja jis g 3131 sphc dengan baja aisi ss 201 terhadap sifat mekanis. [Skripsi] Institut Teknologi Nasional MalangNasrul,Y. L.M., H. Qolik S.A, (2016). Pengaruh variasi arus las smaw terhadap kekerasan dan kekuatan tarik sambungan dissimilar stainless steel 304 dan st 37. Jurnal Teknik Mesin, Universitas Negeri Malang (1), 1-12.Pareke S, Muchsin A.H, Leonard J. (2014). Pengaruh pengelasan logam berbeda (AISI 1045) dengan (AISI 316L) erhadap sifat mekanis dan struktur mikro. Sains dan teknologi, 3(2), 191–198.Pramono, A. (2011). Karakteristik mekanik proses hardening baja AISI 1045 Media Quenching Untuk Aplikasi Sprochet Rantai. Cakram 5(1), 32–38.Sugestian, M Rizsaldy. (2019). Analisa kekuatan sambungan las smaw horizontal down hand pada plate baja jis 3131sphc dan stainless steel 201 dengan aplikasi piles transfer di mesin thermoforming (stacking unit). [Skripsi] Institut Teknologi Nasional Malang.Suhermana , R. M. Ambaritab , R. K. Simangunsongc , P.J. Simanjuntak (2018). Pengaruh jenis elektroda E6013 pada pengelasan SMAW terhadap sifat fisis dan mekanis baja SA106 grade B. Prosiding Seminar Nasional Era Industri (SNEI) UPMI Medan, 50–54Tarkono, Zulhanif, Trisulohadi Ben Fikma (2013). Pengaruh kedalaman alur back chipping pada pengelasan listrik SMAW baja karbon sedang AISI 1045 terhadap uji kekuatan tarik. Fema, 1, 18–27.Trianto A. (2016). Penelitian stainless steel 202 terhadap pengaruh pengelasan gas tungsten arc welding(GTAW) untuk variasi arus 50 A, 100 A, Dan 160 A dengan uji komposisi kimia, uji struktur mikro, uji kekerasan dan uji impact. [Skripsi]. Jurusan Teknik Mesin, Fakultas Teknik UMS.Veranika R.M, Fauzie M.A, Ali H, Solihin M, (2019). Studi pengaruh variasi elektroda e 6013 dan e 7018 terdahap kekuatan tarik dan kekerasan pada bahan baja karbon rendah. Desiminasi Teknologi, 7.Wijoyo, & Aji, B. K. (2015). Kajian kekerasan dan struktur mikro sambungan las GMAW baja karbon tinggi dengan variasi masukan arus listrik. SIMETRIS, 6(2), 243–248. Yakub Y, Nofri M, (2018). Variasi arus listrik terhadap sifat mekanik mikro sambungan las baja tahan karat aisi 304. E-Jurnal WIDYA Eksakta, 1(I).7-11


2020 ◽  
Vol 29 (10) ◽  
pp. 6919-6930
Author(s):  
Farhad Ostovan ◽  
Ehsan Hasanzadeh ◽  
Meysam Toozandehjani ◽  
Ehsan Shafiei ◽  
Khairur Rijal Jamaluddin ◽  
...  

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