Defects of Post Weld Heat Treatment on A36 Carbon Steel Welded by Shielded Metal Arc Welding

2018 ◽  
pp. 481-489
Author(s):  
Norfadhlina Khalid ◽  
Zaherrudin Yusof ◽  
M. A. Mun’aim Mohd Idrus
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Arc Welding ◽  
Post Weld Heat Treatment ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
Weld Heat

scholarly journals Effect of PWHT Temperature and Time on Hardness and Microstructure of 410NiMo Weld Metal

2018 ◽  
Author(s):  
Uğur Özdemir ◽  
Selçuk Keskinkılıç ◽  
Filiz K. Acar ◽  
Fikret Kabakci ◽  
Mustafa Acarer
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
Hydraulic Turbine ◽  
Post Weld Heat Treatment ◽  
Fatigue Properties ◽  
Shielded Metal Arc Welding ◽  
Weld Metals ◽  
Metal Arc Welding ◽  
Hardness Tests ◽  
Weld Heat

ASTM A743 CA6NM alloy is a martensitic stainless steel typically used in energy industry -runners and hydraulic turbine components- due to its superior toughness, yield and fatigue properties. In both the manufacturing, shielded metal arc welding is applied to join for this grade steels. However, weldability of the steels is limited due to formation of hard and brittle phases such as untempered martensite during welding and post weld heat treatment processes. The formation causes a reduction in toughness. In this study, influence of post-weld heat treatment procedure (single tempering and double tempering) and parameters on microstructure and hardness of AWS410NiMo all weld metal. Hardness tests were conducted from weld metal. Microstructures of the all weld metals subjected to different heat treatment process were characterized.

scholarly journals Pengaruh Post Weld Heat Treatment (Pwht) dengan Pemanas Induksi Terhadap Sifat Mekanik dan Struktur Mikro Sambungan Las Shield Metal Arc Welding (Smaw) pada Pipa API 5l X52

ROTASI ◽  
2017 ◽  
Vol 19 (3) ◽  
pp. 117 ◽  
Author(s):  
Gunawan Dwi Haryadi ◽  
Rifky Ismail ◽  
Mahmuda Haira
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Arc Welding ◽  
Post Weld Heat Treatment ◽  
Holding Time ◽  
Metal Arc Welding ◽  
Weld Heat

Saluran perpipaan telah digunakan sebagai salah satu metode yang paling praktis dan  berharga murah untuk transportasi minyak dan gas. Penyambungan pipa sendiri dilakukan dengan proses pengelasan. Pada pengelasan memunculkan efek pemanasan setempat dengan temperatur tinggi yang menyebabkan logam mengalami ekspansi termal maupun penyusutan saat pendinginan. Hal itu menyebabkan terjadinya tegangan sisa, perubahan struktur mikro, kekerasan dan ketangguhan yang berbeda-beda pada tiap-tiap daerah konstruksi. Salah satu cara untuk memperbaiki hal tersebut yaitu dengan cara melakukan post weld heat treatment (PWHT). Penelitian ini bertujuan untuk mengetahui pengaruh PWHT terhadap sifat mekanik dan struktur mikro pada pengelasan shield metal arc welding (SMAW). PWHT dilakukan dengan menggunakan alat pemanas induksi pada temperatur 400ºC, 500 ºC 600 ºC, 700 ºC dan 800 ºC dengan holding time selama 15 detik dan didinginkan di udara terbuka. Selanjutnya dilakukan pengujian impak, kekerasan dan struktur mikro untuk mengetahui pengaruh PWHT yang dilakukan. Dari hasil pengujian impak dan kekerarasan diketahui bahwa semakin tinggi temperature PWHT maka semakin tinggi juga nilai ketangguhan dan semakin menurun nilai kekerasannya. Dan dari pengamatan struktur mikro daerah weld metal PWHT mengakibatkan terjadinya peningkatan jumlah struktur acicular ferrite dan penurunan jumlah struktur widmanstatten ferrite.

Effect of Post-Weld Heat Treatment on Hardness in Superduplex Stainless Steel ASTM A890/A890M - Grade 6A

2020 ◽  
Vol 1012 ◽  
pp. 296-301
Author(s):  
Clélia Ribeiro de Oliveira ◽  
Eloá Lopes Maia ◽  
Solange T. da Fonseca ◽  
Marcelo Martins ◽  
Julián Arnaldo Ávila Díaz ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Arc Welding ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
Superduplex Stainless Steel ◽  
Secondary Austenite ◽  
Welding Processes

Superduplex stainless steel alloy exhibit high mechanical and corrosion resistance, which main industrial application is in the petrochemical industry. The manufacture and maintenance of such equipment usually involve welding processes, followed by post-welded heat treatment and it often becomes impossible to apply heat treatments. Thereby, the purpose of this work is to verify the effect of a post-welded heat treatment on shielded metal arc welding in steel grade ASTM A890/A890M - grade 6A. The microstructure in the as-welded condition consisted of austenite, secondary austenite, and ferrite phases and, the post-welded heat treatment condition exhibited only austenite and ferrite. The hardness in the melt zone reached values of 300 HV after welding and, the value was reduced to 260 HV in the post-welded heat treatment condition.

Sign in / Sign up

Export Citation Format

Share Document