Experimental determination of position effect on mechanical and metallurgical properties of HSLA multi-pass girth weld at natural gas pipelines

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SABOKROUH MAJID; Ajorlo Ali Reza

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF MANUFACTURING ENGINEERING Year:2019 | Volume:5 | Issue:4 Page(s): 13-25

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Title

Experimental determination of position effect on mechanical and metallurgical properties of HSLA multi-pass girth weld at natural gas pipelines

Author(s)

SABOKROUH MAJID | Ajorlo Ali Reza | Issue Writer Certificate

Keywords

High strength low alloy steel

Gas pipeline

Girth weld

Abstract

Shield metal arc welding on the High strength low alloy steels in pipelines to transport natural gas from Iran is of great importance. In this paper, mechanical and metallurgical properties of multi-pass weld in weld zone, heat affected zone (HAZ), and base metal (with 36 inch outside diameter) for determination of critical area is investigated. Also Chemical analysis, metallography, tensile, impact and hardness testes in different positions of pipe (hours 12-1: 30, 1: 30-3, 3-4: 30 and 4: 30-6) were carried out. Tensile test results showed the lowest ultimate strength (Vertical to weld and in position 3-4: 30) equal to 463mpa, and the lowest energy impact (Vertical to weld and in position 1: 30-3) equal to 96J that determine 61 percent reduction compared to the base metal. The amount of hardness variation in different areas and positions is negligible (less than 5 percent). Images of metallographic test made by light and electron microscopes demonstrated that the amount of perlite cap pass weld and heat affected zone near the base metal were decreased compared to main metal to respectively 12. 5 and 25 percent. The amount of Nb reduction in position (4: 30-6) relative to the base metal is 0. 025.

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APA: Copy

SABOKROUH, MAJID, & Ajorlo, Ali Reza. (2019). Experimental determination of position effect on mechanical and metallurgical properties of HSLA multi-pass girth weld at natural gas pipelines. IRANIAN JOURNAL OF MANUFACTURING ENGINEERING, 5(4 ), 13-25. SID. https://sid.ir/paper/268238/en

Vancouver: Copy

SABOKROUH MAJID, Ajorlo Ali Reza. Experimental determination of position effect on mechanical and metallurgical properties of HSLA multi-pass girth weld at natural gas pipelines. IRANIAN JOURNAL OF MANUFACTURING ENGINEERING[Internet]. 2019;5(4 ):13-25. Available from: https://sid.ir/paper/268238/en

IEEE: Copy

MAJID SABOKROUH, and Ali Reza Ajorlo, “Experimental determination of position effect on mechanical and metallurgical properties of HSLA multi-pass girth weld at natural gas pipelines,” IRANIAN JOURNAL OF MANUFACTURING ENGINEERING, vol. 5, no. 4 , pp. 13–25, 2019, [Online]. Available: https://sid.ir/paper/268238/en

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