scholarly journals EFFECT OF WELDING SEQUENCE ON MULTI PASS TEMPER BEAD WELDING JOINT OF PT .INKA BOGIE LRT ON DISTORCTION, MICRO STRUCTURE AND HARDNESS

2019 ◽  
Vol 11 (2) ◽  
pp. 103-111
Author(s):  
Moh M Munir ◽  
Mukhlis Mukhlis ◽  
Imam Khoirul R ◽  
Hendri B ◽  
M Syaiful A ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Micro Structure ◽  
Welding Joint ◽  
Welding Sequence ◽  
Round Bar ◽  
Weld Heat

Bogie kereta api merupakan salah satu bagian yang sangat penting, karena bogie menahan beban yang ada pada suatu gerbong kereta api. Karena sifatnya yang sangat penting maka bogie kereta api harus memiliki sifat dan kekuatan yang baik. Bogie hasil proses fabrikasi dengan pengelasan, memerlukan proses annealing untuk mereduksi tegangan sisa yang terjadi. Proses annealing atau Post Weld Heat Treatment tersebut membutuhkan furnace yang besar, energi listrik yang besar, dan tentunya biaya jadi lebih mahal. Pada penelitian ini,   dilakukan alternative  proses  pengelasan dengan teknik  Temper bead welding, pada sambungan frame bogie plate to plate dan plate to round bar. Selain itu juga melakukan proses Post Weld Heat Treatment pada sambungan plate to plte, dan sequence of welding pada sambungan plate to round bar. Hasil penelitian menunjukkan, bahwa proses Temper bead welding yang dilakukan terhadap proses fabrikasi joint bogie LRT plate to plate dan joint plate to round bar, dapat menurunkan nilai kekerasan, namun belum menunjukkan perbedaan yang signifikan. Sedangkan proses Temper bead welding dapat menghasilkan distorsi yang paling kecil pada bogie LRT. Hasil pengukuran distrosi menujukan pengelasan sequence B menghasilkan distorsi paling besar, sedangkan variasi distorsi terkecil adalah varisi sequence C dengan temper bead welding.

The Effect of PWHT on the Material Properties and Micro Structure in Inconel 625 and Inconel 725 Buttered Joints

2003 ◽  
Author(s):  
Vigdis Olden ◽  
Per Egil Kvaale ◽  
Per Arne Simensen ◽  
Synno̸ve Aaldstedt ◽  
Jan Ketil Solberg
Keyword(s):  
Heat Treatment ◽  
Impact Toughness ◽  
Post Weld Heat Treatment ◽  
Fusion Line ◽  
Coarse Grained ◽  
Inconel 625 ◽  
Micro Structure ◽  
Mixed Zone ◽  
Heat Treated ◽  
Weld Heat

This report describes investigations performed on as welded and post weld heat treated samples of AISI 8630 steel, buttered with Inconel 625 and Inconel 725. The investigations have focused on the properties and microstructure in the partial mixed zone between the buttering and the steel before and after post weld heat treatment. The samples were heat treated for 4 1/2 hours at 640°C, 665° and 690°C and investigated with respect to mechanical properties and microstructure near the fusion line. A range of testing and analyses were performed including notch impact toughness testing, identification of fracture initiation and propagation in impact specimens, hydrogen measurements, examination of the micro structure in steel and Inconel using light microscope, hardness testing and electron micro-probe analysis of the alloying elements across the fusion line. Additional investigations in TEM on samples from an actual joint, post weld heat treated at 665°C were also performed. The results show that post weld heat treatment at 665°C and 690°C reduced the impact toughness in coarse grained heat affected zone, caused by decarburisation, ferrite formation and grain growth. The partially mixed zone (5–10μm) of the Inconel buttering, gained partly extremely high hardness caused by carbon enrichment, reaustenitization and formation of virgin martensite. As welded samples gave more favorable properties and microstructure than the post weld heat treated ones.

The Effect of Holding Time under Heat Treatment on the Properties of T92 Steel Welding Joint

2014 ◽  
Vol 1079-1080 ◽  
pp. 7-12
Author(s):  
Dong Xu Yang ◽  
Lu Yang ◽  
An Guo Huang
Keyword(s):  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Holding Time ◽  
Welding Joint ◽  
Heat Resistant Alloy ◽  
Fine Grain ◽  
Joint Property ◽  
Tempering Time ◽  
Martensite Structure ◽  
Weld Heat

This article describes the welding joint property of ferrite heat-resistant alloy steel T92 by taking tungsten inert gas (TIG) welding measures before post weld heat treatment on 760°C with holding time of 0,2,4 hours. Test data were analyzed in relation to microstructure,tensile and impact properties and hardness distribution on the welding joint,then the effect of holding time under post weld heat treatment on properties of joints can be investigated.The results demonstrated that micro-hardness in the weld and tensile strength decreased with tempering time prolonging, while impact toughness increased with the extension of tempering time. The untempered martensite in form of needle was coarse in the joint. With the extension of holding time under tempering, the martensite structure obtains fine grain and the lath characteristic becomes obvious. It can be found that the segregation of carbides in base metal occurred and the content of ferrite increased with the extension of holding time under tempering.

Effect of filler wire and post weld heat treatment on the mechanical properties of laser beam-welded AA2198

2021 ◽  
pp. 111257
Author(s):  
Theano N. Examilioti ◽  
Nikolai Kashaev ◽  
Volker Ventzke ◽  
Benjamin Klusemann ◽  
Nikolaos D. Alexopoulos
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Laser Beam ◽  
Post Weld Heat Treatment ◽  
Filler Wire ◽  
Weld Heat
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