Microstructural and Mechanical Properties of Welded High Strength Steel Plate Using SMAW and SAW Method for LPG Storage Tanks

Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering

材料科学;冶金学;化学工业

Winarto, Winarto^1 ; Riastuti, Rini^1 ; Kumeidi, Nur^1

Department of Metallurgical and Materials Engineering, Universitas Indonesia, Depok

16424, Indonesia^1

关键词: High strength steel plates;    Liquefied petroleum gas (LPG);    Lower hardness;    Micro-structural;    Microstructure and mechanical properties;    Welding current;    Welding process;    Welding speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/316/1/012051/pdf
DOI  :  10.1088/1757-899X/316/1/012051

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Indonesian government policy to convert energy consumption for domestic household from kerosene to liquefied petroleum gas (LPG) may lead to the increasing demand for LPG storage tank. LPG storage tank with a large capacity generally used the HSLA steel material of ASTM A516 Grade 70 joined by SMAW or combination between SMAW and SAW method. The heat input can affect the microstructure and mechanical properties of the weld area. The input heat is proportional to the welding current and the arc voltage, but inversely proportional to its welding speed. The result shows that the combination of SMAW-SAW process yield the lower hardness in the HAZ and the fusion zone compared to the singe SMAW process. PWHT mainly applied to reduce residual stress of welded joint. The result shows that PWHT can reduce the hardness in the HAZ and the fusion zone in comparing with the singe SMAW process. The microstructure of weld joint shows a coarser structure in the combined welding process (SMAW-SAW) comparing with the single welding process (SMAW).