Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 24, Issue 1, Pages 1-7Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2018.1467847
Keywords
Underwater wet welding; dissimilar joint; microstructure; mechanical properties
Funding
- Fundamental Research Funds for the Central Universities [HIT.MKSTISP. 2016 17]
- Shandong Provincial Key Research and Development plan [2017CXGC0922]
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Dissimilar joint between 304L austenitic stainless steel and low-alloy steel 16Mn was underwater wet welded using self-shielded nickel-based tubular wire. Microstructure, mechanical properties and corrosion behaviour of dissimilar welded joints were discussed. Ni-based weld metal was fully austenitic with well-developed columnar sub-grains. Type II boundary existed between Ni-based weld metal and ferritic base metal in underwater welds similar to that in air welds. Major alloying elements distributed non-uniformly across the austenitic weld metal/16Mn interface. Maximum hardness values in wet welding appeared in a coarse-grained heat-affected zone at the 16Mn side, which possessed very low impact toughness. Underwater Ni-based welded joints fractured at Ni-based weld metal under tensile test. Ni-based weld metal had favourable corrosion resistance similar to 304L base metal.
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