METALLURGICAL AND MECHANICAL INVESTIGATION OF TIG ARC WELDMENTS FOR API 32″ GAS PIPE

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-03-15 DOI:10.36547/ams.28.1.1324

T. El-Bitar, Maha El-Meligy, M. Gamil

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引用次数: 0

Abstract

API steel gas pipe of 32" diameter and 15.9 mm thickness was investigated to characterize the steel grade and assess weldability for fourteen-consecutive passes of TIG arc welding technology. The parent Metal (PM) contains 0.02% C in addition to 0.02% Nb. A steel electrode for TIG process was used containing 5.6% Cr and 0.56% Mo. Standard V-groove was mechanically prepared to suite butt welding. The microstructure of the PM was containing mainly fine acicular ferrite satisfying the essential requirements of API specifications for grade X60. The weld metal (WM) was containing very fine acicular ferrite and showing the maximum hardiness values. Heat affected zone (HAZ) structure still contains acicular ferrite but it became coarse, possessing lower hardness than that of WM. HAZ does not exceed 2-2.5 mm adjacent to the welded V-groove. The fractured tensile welded specimens were necked and failed at the HAZ. The impact transition temperature (ITT) was detected as -35 oC. However, the mechanical properties of the WM did not negatively affected by the welding process and still fair satisfying the requirements of API X60.

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API 32″燃气管道tig弧焊件的冶金和力学研究

研究了直径为32“、厚度为15.9 mm的API钢制气体管道，以确定其钢级，并评估其在TIG电弧焊接技术的四个连续道次中的可焊性。母材（PM）除含有0.02%Nb外，还含有0.02%C。采用含5.6%Cr和0.56%Mo的TIG焊接工艺用钢焊条。标准的V型坡口是用机械方法制备的，以适应对接焊接。PM的显微组织主要为细针状铁素体，满足API X60级规范的基本要求。焊接金属（WM）含有非常细的针状铁素体，并显示出最大的硬度值。热影响区（HAZ）组织仍含有针状铁素体，但变得粗糙，硬度低于WM。焊接V形坡口附近的HAZ不超过2-2.5 mm。断裂的拉伸焊接试样在HAZ处发生颈缩和失效。冲击转变温度（ITT）检测为-35℃。然而，WM的机械性能没有受到焊接工艺的负面影响，仍然可以满足API X60的要求。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.