Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Intercorrelation of Interpass Temperature – Base Metal Thickness – Microstructure and Cracking of Weld Metal Deposited from E8010-P1 Cellulosic Electrodes

Authors
Masoud Mosallaee pour
Maryam Sadat Amini
Mehdi Kalantar
Seyed Sadegh Ghasemi
Yazd University, Mineral and Metallurgy Faculty, Material Science group
10.30501/jamt.2636.70313
Abstract
In this study, the cracking sensitivity of deposited weld of E8010-P1 cellulosic electrodes as a function of base metal thickness and interpass temperature was analyzed. For this purpose, different welded samples (different base metal thickness and interpass temperature) were subjected to the bending test according to the SEP-1390 bohler specification. Studies illustrated an increase in the minimum interpass temperature from 80˚C to 120˚C is required with increasing base metal thickness from 20mm to 30mm to prevent weld cracking. Increasing of interpass temperature not only decreases the welding cooling rate but also reduces the heat sink effect of base metal and therefore decreases the cracking sensitivity. Structural studies indicated that the main cause of E8010-P1 weld metal cracking is development of undesirable phases such as grain boundary and widmanstaten ferrite in the weld metal. In addition, optimum cooling time between 800-500˚C (∆t8/5) for preventing E8010-P1 weld metal cracking determines to be around 180±10s.
Keywords
Cracking
SMAW
Interpass Temperature
E8010-P1
Pipe Lines
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  • Receive Date 26 April 2015
  • Revise Date 10 November 2015
  • Accept Date 05 February 2016