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ISSN 1004-9037
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Edited by: Editorial Board of Journal of Data Acquisition and Processing
P.O. Box 2704, Beijing 100190, P.R. China
Sponsored by: Institute of Computing Technology, CAS & China Computer Federation
Undertaken by: Institute of Computing Technology, CAS
Published by: SCIENCE PRESS, BEIJING, CHINA
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      09 May 2023, Volume 38 Issue 3
    Article

    DETERMINING THE EFFECT OF PRE-HEATING ON DIFFERENT MATERIAL WELD JOINT OF P&H-11 CASTING AND MILD STEEL PLATE
    Kumar Sawrav*a, Manoj Barikb, Arup Mukherjeec, Somanath Nayakc
    Journal of Data Acquisition and Processing, 2023, 38 (3): 664-678 . 

    Abstract

    Two differently manufactured steel materials are ductile cast iron, Medium Carbon with Mn-Mo alloy steel (P&H-11), and a mild steel combination welded to fabricate a structural component. A typical problem analyzed and discussed related to premature failure under stress and fatigue. It gives guidelines to engineers and fabricators to follow the discipline of pre-heating when they are trying to join two materials with indifferent microstructures especially using hot operations. While the investigation of the heat-affected zone of the plate and casting fillet joint, microhardness was observed at higher sides varying from 400-600 HV, against the recommendation of 350 HV max. The high Hardness at the heat-affected zone has contributed to crack initiation due to high localized stress. Along with microhardness, chemical and microstructural studies were also done to correlate the cause of failure. The effect of higher microhardness has been eliminated through pre-heating during welding. A suitable pre-heating temperature has been established through experimentation for ductile cast iron and mild steel combination of 200 to 250 deg. C was the most optimized and suitable solution.

    Keyword

    Welding; Ductile cast iron; mild steel; welding; pre-heat; heat affected zone; Microhardness


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