The impact of heat input on the mechanical properties and microstructure of High Strength Low Alloy steel welded joint by GMA welding process

Q2 Materials Science

Engineering Solid Mechanics Pub Date : 2021-01-01 DOI:10.5267/J.ESM.2021.2.001

S. Rizvi, R. Singh, S. Gupta

引用次数: 1

Abstract

The basic aim of this study was to find a relationship between heat input and mechanical properties of high strength low alloy steel (HSLA) welded joints and also elaborate its effect on microstructure. The combined effect of welding current, voltage and speed i.e. Heat Input on mechanical properties of High Strength Low Alloy Steel (ASTM A242 type-II) weldments have been studied in the present work. HSLA steel work pieces were welded by Gas metal arc welding (GMAW) process under varying welding current, arc voltage, and welding speed. Total nine samples were prepared at different heat input level i.e. 1.872 kJ/mm, 1.9333 kJ/mm, 2.0114 kJ/mm, 2.1 kJ/mm, 2.1956 kJ/mm, 2.296 kJ/mm, 2.4 kJ/mm, 2.5067 kJ/mm and 2.6154 kJ/mm It was observed that as heat input increases the ultimate tensile strength and microhardness of weldment decreased while impact strength increased and it was also observed that on increasing the heat input grain size of microstructure tends to coarsening it is only due to decreasing in cooling rate.

查看原文本刊更多论文

热输入对低合金钢GMA焊接接头力学性能和组织的影响

本研究的基本目的是找出高强度低合金钢(HSLA)焊接接头的热输入与力学性能之间的关系，并阐述其对显微组织的影响。本文研究了焊接电流、电压和速度(即热输入)对高强度低合金钢(ASTM A242 - ii型)焊接件力学性能的综合影响。在不同的焊接电流、电弧电压和焊接速度下，采用气体保护金属弧焊(GMAW)工艺对HSLA钢件进行了焊接。在1.872 kJ/mm、1.9333 kJ/mm、2.0114 kJ/mm、2.1 kJ/mm、2.1956 kJ/mm、2.296 kJ/mm、2.4 kJ/mm、2.5067 kJ/mm和2.6154 kJ/mm不同的热输入水平下制备了9个试样。结果表明，随着热输入的增加，焊件的极限抗拉强度和显微硬度降低，冲击强度增加;随着热输入的增加，组织晶粒尺寸趋于粗化，这只是由于冷却速度的降低所致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Engineering Solid Mechanics Materials Science-Metals and Alloys

CiteScore

3.00

自引率

0.00%

发文量

期刊介绍： Engineering Solid Mechanics (ESM) is an online international journal for publishing high quality peer reviewed papers in the field of theoretical and applied solid mechanics. The primary focus is to exchange ideas about investigating behavior and properties of engineering materials (such as metals, composites, ceramics, polymers, FGMs, rocks and concretes, asphalt mixtures, bio and nano materials) and their mechanical characterization (including strength and deformation behavior, fatigue and fracture, stress measurements, etc.) through experimental, theoretical and numerical research studies. Researchers and practitioners (from deferent areas such as mechanical and manufacturing, aerospace, railway, bio-mechanics, civil and mining, materials and metallurgy, oil, gas and petroleum industries, pipeline, marine and offshore sectors) are encouraged to submit their original, unpublished contributions.