scholarly journals Laser Dissimilar Welding of AISI 430F and AISI 304 Stainless Steels

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4540 ◽  
Author(s):  
Krzysztof Pańcikiewicz ◽  
Aleksandra Świerczyńska ◽  
Paulina Hućko ◽  
Marek Tumidajewicz
Keyword(s):  
Stainless Steel ◽  
Weld Metal ◽  
Welded Joint ◽  
Dissimilar Welding ◽  
Chemical Inhomogeneity ◽  
Destructive Testing ◽  
Aisi 304 ◽  
Martensitic Microstructure ◽  
Δ Ferrite ◽  
Visual Testing

A dissimilar autogenous laser welded joint of AISI 430F (X12CrMoS17) martensitic stainless steel and AISI 304 (X5CrNi18-10) austenitic stainless steel was manufactured. The welded joint was examined by non-destructive visual testing and destructive testing by macro- and microscopic examination and hardness measurements. With reference to the ISO 13919-1 standard the welded joint was characterized by C level, due to the gas pores detected. Microscopic observations of AISI 430F steel revealed a mixture of ferrite and carbides with many type II sulfide inclusions. Detailed analysis showed that they were Cr-rich manganese sulfides. AISI 304 steel was characterized by the expected austenitic microstructure with banded δ-ferrite. Martensitic microstructure with fine, globular sulfide inclusions was observed in the weld metal. The hardness in the heat-affected zone was increased in the martensitic steel in relation to the base metal and decreased in the austenitic steel. The hardness range in the weld metal, caused by chemical inhomogeneity, was 184–416 HV0.3.

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

2020 ◽  
Vol 17 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Taiwo Ebenezer Abioye ◽  
Igbekele Samson Omotehinse ◽  
Isiaka Oluwole Oladele ◽  
Temitope Olumide Olugbade ◽  
Tunde Isaac Ogedengbe
Keyword(s):  
Stainless Steel ◽  
Welded Joint ◽  
Grain Structure ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Corrosion Properties ◽  
Aisi 304 ◽  
Content Type ◽  
Post Annealing ◽  
Weld Heat

Purpose The purpose of this study is to determine the effects of post-annealing and post-tempering processes on the microstructure, mechanical properties and corrosion resistance of the AISI 304 stainless steel gas metal arc weldment. Design/methodology/approach Gas metal arc welding of AISI 304 stainless steel was carried out at an optimized processing condition. Thereafter, post-annealing and post-tempering processes were performed on the weldment. The microstructure, mechanical and electrochemical corrosion properties of the post-weld heat treated samples, as compared with the as-welded, were investigated. Findings The as-welded joint was characterized with sub-granular grain structure, martensite formation and Cr-rich carbides precipitates. This made it harder than the post-annealed and post-tempered joints. Because of slower cooling in the furnace, the post-annealed joint contained Cr-rich carbides precipitates. However, the microstructure of the post-tempered joint is more refined and significantly devoid of the carbide precipitates. Post-tempering process improved the elongation (∼23%), tensile (∼10%) and impact (∼31%) strengths of the gas metal arc AISI 304 stainless steel weldment, while post-annealing process improved the elongation (∼20%) and impact strength (∼72%). Owing to the refined grain structure and significant elimination of the Cr-rich carbide precipitates at the joint, the post-tempered joint exhibited better corrosion resistance in 3.5 Wt.% NaCl solution than the post-annealed and the as-welded joints. Originality/value The appropriate post-weld heat treatment that enhances microstructural homogeneity and quality of the AISI 304 gas metal arc welded joint was determined.

scholarly journals Vibratory Stress Relief and Vibratory Weld Conditioning of Flux cored arc welded CA6NM steel

2019 ◽  
Vol 9 (1) ◽  
pp. 32
Author(s):  
Luiz Fernando Cursino Briet de Almeida ◽  
Julio Cesar Lourenco ◽  
Maria Ismenia Sodero Toledo Faria ◽  
Decio Lima Vieira ◽  
Alain Laurent Marie Robin ◽  
...  
Keyword(s):  
Weld Metal ◽  
Welded Joint ◽  
Stress Relief ◽  
Delta Phase ◽  
Martensitic Microstructure ◽  
Hydraulic Turbines ◽  
Welding Electrode ◽  
The Individual ◽  
Ca6nm Steel ◽  
Hardness Values

ASTM A743 CA6NM steel is used in the manufacturing of hydraulic turbines components. Multipass welding is commonly used for their fabrication or repairing. In this work, two different vibratory welding procedures were studied: vibration applied during welding (VWC) and vibration applied after welding (VSR). Results have shown that in both conditions, CA6NM steel presented a martensitic microstructure, in which the VSR welded joint presented column-shaped packets and fine martensite delineating the individual beads, while VWC joint presented grain refinement. Heat affected zones (HAZ) presented δ-phase in small amounts for both conditions in the regions which reached higher temperatures. VSR and VWC conditions presented similar behavior in terms of hardness, HAZ hardness values being close to those of the weld metal, except for the root regions, where higher values were obtained. Charpy-V results showed that HAZs presented higher impact values than those of the weld metal. The low impact values of the weld metal were attributed to presence of inclusions from the welding electrode.

scholarly journals Microstructure, roughness, and corrosion resistance of X5CrNi18-10 austenite stainless steel welded joint

2021 ◽  
pp. 7-7
Author(s):  
Bojana Radojkovic ◽  
Bore Jegdic ◽  
Jovanka Kovacina ◽  
Sanja Stevanovic ◽  
Dunja Marunkic
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Weld Metal ◽  
Base Metal ◽  
Pitting Corrosion ◽  
Welded Joint ◽  
Electrochemical Testing ◽  
Limit Value ◽  
Before And After ◽  
Degree Of Sensitization

The influence of the microstructure of the X5CrNi18-10 stainless steel welded joint on its resistance to general, pitting, and intergranular corrosion was analysed. The structure of weld metal, heat affected zone (HAZ) and base metal before and after electrochemical testing was analysed using SEM/EDS. The influence of the roughness level of the welded joint on its resistance to the mentioned types of corrosion was examined as well. Although the degree of sensitization of HAZ was significantly lower than the limit value, HAZ showed a noticeably greater tendency to general and pitting corrosion than weld metal and base metal. Polishing has been shown to significantly improve the corrosion resistance of HAZ than in the case of other parts of the welded joint.

scholarly journals PENGARUH TEMPERATUR CRYOGENIC TERHADAP KETANGGUHAN IMPACT SAMBUNGAN PENGELASAN STAINLESS STEEL AISI 304

2020 ◽  
Vol 4 (1) ◽  
pp. 50
Author(s):  
Furkan Furkan ◽  
Akhyar Ibrahim ◽  
Azwar Azwar
Keyword(s):  
Stainless Steel ◽  
Weld Metal ◽  
Fusion Line ◽  
Aisi 304 ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Seiring dengan berkembangnya teknologi telah dihasilkan pada baja dengan berbagai jenis sesuai dengan fungsi dan tujuan pemakaian. Salah satunya adalah baja tahan karat austenitic AISI 304 umumnya digunakan untuk memproduksi tangki kargo gas alam cair (LNG) karena kinerjanya yang lebih tinggi di lingkungan yang sangat rendah dan tahan terhadap korosi. Tujuan penelitian ini adalah Mengetahui pengaruh temperatur cryogenic terhadap ketangguhan impact daerah HAZ, daerah weld metal, dan daerah Fusion Line Baja tahan karat AISI 304, melakukan analisa fraktografi pada permukaan patahan. Metode penelitian ini dilakukan untuk mengetahui pengaruh temperature cryogenic terhadap ketangguhan impact sambungan pengelasan stainless stell AISI 304, dimulai dari mempersiapkan alat dan bahan, proses pengelasan, pengujian impact charpy dan analisa patahan. Hasil penelitian menunjukkan bahwa hasil nilai rata-rata pengujian impact tertinggi terdapat pada temperatur ruangan di daerah HAZ yaitu 3,71 joule/mm2 dan hasil nilai pengujian impact terendah terdapat pada temperatur cryogenic di daerah weld metal yaitu 0,69 joule/mm2. Pengujian impact pada temperatur cryogenic didapatkan hasil nilai pengujian impact terendah dibandingkan dengan nilai hasil pengujian impact temperatur ruangan. Spesimen di daerah HAZ, fusion line, dan weld metal, pada temperatur cryogenic mengalami bentuk perpatahan getas. Maka dapat diambil kesimpulan bahwa, berdasarkan hasil pengujian impact material stainless steel aisi 304 temperatur cryogenic dan temperatur ruangan, terlihat jelas bahwa kekuatan beban kejut material stainless steel AISI 304 pada pengujian temperatur cryogenic menurun di daerah HAZ, fusion line, dan weld metal dibandingkan dengan kekuatan beban kejut material stainless steel AISI 304 pada temperatur ruangan.Kata Kunci : Stainless Steel AISI 304, Temperature Cryogenic, Pengelasan SMAW, Impact Charpy, Analisa Patahan.

Phase Formation in Austenitic Stainless Steel A-TIG Welds

2006 ◽  
Vol 514-516 ◽  
pp. 549-553
Author(s):  
António Rodrigues ◽  
Altino Loureiro ◽  
António Castanhola Batista
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Thin Layer ◽  
Ferrite Content ◽  
Aisi 304 ◽  
Activating Flux ◽  
Δ Ferrite ◽  
Steel Aisi ◽  
Melted Material ◽  
Stainless Steel Aisi

The aim of this research is to study the effect of the welding conditions and of an activating flux on the microstructure of the melted material of autogeneous A-TIG welds, made on austenitic stainless steel AISI 304. The increase of heat-input coarsened the microstructure, changed its morphology and decreased the δ-ferrite content retained in the microstructure. The use of a TiO2 activating flux does not significantly affect the microstructures. A thin layer tends to form in the surface of the welds, which microstructure and ferrite content are different from those observed in its core.

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