The factors that influence solidification cracking in low carbon low alloy steels are reviewed and the susceptibility of cellulosic weld metals to such cracking is investigated for root pass pipeline girth welds. Particular emphasis has been placed on the influence of weld metal composition and welding speed. Root pass welds were deposited on X80 grade pipe using the manual metal arc welding process and a range of both undermatching (E6010) and strength matching (E9010) cellulosic consumables from commercial suppliers. The crack testing was carried out on pipe pups using a standard pipe preparation and simulated stovepipe welding of quadrants restrained by tack welds. Solidification cracking was found in both E6010 and E9010 welds, with cracking being more prevalent in the lower strength weld metal. In general, solidification cracking was enhanced by an increase in welding speed from 300 to 500 mm min -1. Increased phosphorus or sulphur contents up to approximately 0.03 wt-% were found to have little effect on susceptibility to solidification cracking.
Root pass solidification cracking in low carbon pipeline girth welds deposited via cellulosic manual metal arc welding
Science and Technology of Welding and Joining ; 8 , 2 ; 102-112
2003
11 Seiten, 14 Bilder, 3 Tabellen, 19 Quellen
Article (Journal)
English
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